1
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Laughlin DC. Unifying functional and population ecology to test the adaptive value of traits. Biol Rev Camb Philos Soc 2024. [PMID: 38855941 DOI: 10.1111/brv.13107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 05/23/2024] [Accepted: 05/29/2024] [Indexed: 06/11/2024]
Abstract
Plant strategies are phenotypes shaped by natural selection that enable populations to persist in a given environment. Plant strategy theory is essential for understanding the assembly of plant communities, predicting plant responses to climate change, and enhancing the restoration of our degrading biosphere. However, models of plant strategies vary widely and have tended to emphasize either functional traits or life-history traits at the expense of integrating both into a general framework to improve our ecological and evolutionary understanding of plant form and function. Advancing our understanding of plant strategies will require investment in two complementary research agendas that together will unify functional ecology and population ecology. First, we must determine what is phenotypically possible by quantifying the dimensionality of plant traits. This step requires dense taxonomic sampling of traits on species representing the broad diversity of phylogenetic clades, environmental gradients, and geographical regions found across Earth. It is important that we continue to sample traits locally and share data globally to fill biased gaps in trait databases. Second, we must test the power of traits for explaining species distributions, demographic rates, and population growth rates across gradients of resource limitation, disturbance regimes, temperature, vegetation density, and frequencies of other strategies. This step requires thoughtful, theory-driven empiricism. Reciprocal transplant experiments beyond the native range and synthetic demographic modelling are the most powerful methods to determine how trait-by-environment interactions influence fitness. Moving beyond easy-to-measure traits and evaluating the traits that are under the strongest ecological selection within different environmental contexts will improve our understanding of plant adaptations. Plant strategy theory is poised to (i) unpack the multiple dimensions of productivity and disturbance gradients and differentiate adaptations to climate and resource limitation from adaptations to disturbance, (ii) distinguish between the fundamental and realized niches of phenotypes, and (iii) articulate the distinctions and relationships between functional traits and life-history traits.
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Affiliation(s)
- Daniel C Laughlin
- Botany Department, University of Wyoming, Laramie, Wyoming, 82071, USA
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2
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Wang Y, Braghiere RK, Yin Y, Yao Y, Hao D, Frankenberg C. Beyond the visible: Accounting for ultraviolet and far-red radiation in vegetation productivity and surface energy budgets. GLOBAL CHANGE BIOLOGY 2024; 30:e17346. [PMID: 38798167 DOI: 10.1111/gcb.17346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 05/03/2024] [Accepted: 05/08/2024] [Indexed: 05/29/2024]
Abstract
Photosynthetically active radiation (PAR) is typically defined as light with a wavelength within 400-700 nm. However, ultra-violet (UV) radiation within 280-400 nm and far-red (FR) radiation within 700-750 nm can also excite photosystems, though not as efficiently as PAR. Vegetation and land surface models (LSMs) typically do not explicitly account for UV's contribution to energy budgets or photosynthesis, nor FR's contribution to photosynthesis. However, whether neglecting UV and FR has significant impacts remains unknown. We explored how canopy radiative transfer (RT) and photosynthesis are impacted when explicitly implementing UV in the canopy RT model and accounting for UV and FR in the photosynthesis models within a next-generation LSM that can simulate hyperspectral canopy RT. We validated our improvements using photosynthesis measurements from plants under different light sources and intensities and surface reflection from an eddy-covariance tower. Our model simulations suggested that at the whole plant level, after accounting for UV and FR explicitly, chlorophyll content, leaf area index (LAI), clumping index, and solar radiation all impact the modeling of gross primary productivity (GPP). At the global scale, mean annual GPP within a grid would increase by up to 7.3% and the increase is proportional to LAI; globally integrated GPP increases by 4.6 PgC year-1 (3.8% of the GPP without accounting for UV + FR). Further, using PAR to proxy UV could overestimate surface albedo by more than 0.1, particularly in the boreal forests. Our results highlight the importance of improving UV and FR in canopy RT and photosynthesis modeling and the necessity to implement hyperspectral or multispectral canopy RT schemes in future vegetation and LSMs.
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Affiliation(s)
- Yujie Wang
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
| | - Renato K Braghiere
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
| | - Yi Yin
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
- Department of Environmental Studies, New York University, New York, New York, USA
| | - Yitong Yao
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
| | - Dalei Hao
- Atmospheric, Climate, and Earth Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, USA
| | - Christian Frankenberg
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
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3
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Zheng Y, Zhao W, Chen A, Chen Y, Chen J, Zhu Z. Vegetation canopy structure mediates the response of gross primary production to environmental drivers across multiple temporal scales. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170439. [PMID: 38281630 DOI: 10.1016/j.scitotenv.2024.170439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 01/10/2024] [Accepted: 01/23/2024] [Indexed: 01/30/2024]
Abstract
Gross primary production (GPP) is a critical component of the global carbon cycle and plays a significant role in the terrestrial carbon budget. The impact of environmental factors on GPP can occur through both direct (by influencing photosynthetic efficiency) and indirect (through the modulation of vegetation structure) pathways, but the extent to which these mechanisms contribute has been seldom quantified. In this study, we used structural equation modeling and observations from the FLUXNET network to investigate the direct and indirect effects of environmental factors on terrestrial ecosystem GPP at multiple temporal scales. We found that canopy structure, represented by leaf area index (LAI), is a crucial intermediate factor in the GPP response to environmental drivers. Environmental factors affect GPP indirectly by altering canopy structure, and the relative proportion of indirect effects decreased with increasing LAI. The study also identified different effects of environmental factors on GPP across time scales. At the half-hourly time scale, radiation was the primary driver of GPP. In contrast, the influences of temperature and vapor pressure deficit took on greater prominence at longer time scales. About half of the total effect of temperature on GPP was indirect through the regulation of canopy structure, and the indirect effect increased with increasing time scale (GPPNT-based models: 0.135 (half-hourly) vs. 0.171 (daily) vs. 0.189 (weekly) vs. 0.217 (monthly); GPPDT-based models: 0.139 vs. 0.170 vs. 0.187 vs. 0.215; all values were reported in gC m-2 d-1 °C-1, P < 0.001); while the indirect effect of radiation on GPP was comparatively lower, accounting for less than a quarter of the total effect. Furthermore, we observed a direct, negative-to-positive impact of precipitation on GPP across timescales. These findings provide crucial information on the interplay between environmental factors and LAI on GPP and enable a deeper understanding of the driving mechanisms of GPP.
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Affiliation(s)
- Yaoyao Zheng
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen 518055, China; Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Weiqing Zhao
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen 518055, China; Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Anping Chen
- Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO, USA
| | - Yue Chen
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen 518055, China; Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Jiana Chen
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen 518055, China; Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Zaichun Zhu
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen 518055, China; Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen 518055, China.
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4
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Famiglietti CA, Worden M, Anderegg LDL, Konings AG. Impacts of climate timescale on the stability of trait-environment relationships. THE NEW PHYTOLOGIST 2024; 241:2423-2434. [PMID: 38037289 DOI: 10.1111/nph.19416] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 11/02/2023] [Indexed: 12/02/2023]
Abstract
Predictive relationships between plant traits and environmental factors can be derived at global and regional scales, informing efforts to reorient ecological models around functional traits. However, in a changing climate, the environmental variables used as predictors in such relationships are far from stationary. This could yield errors in trait-environment model predictions if timescale is not accounted for. Here, the timescale dependence of trait-environment relationships is investigated by regressing in situ trait measurements of specific leaf area, leaf nitrogen content, and wood density on local climate characteristics summarized across several increasingly long timescales. We identify contrasting responses of leaf and wood traits to climate timescale. Leaf traits are best predicted by recent climate timescales, while wood density is a longer term memory trait. The use of sub-optimal climate timescales reduces the accuracy of the resulting trait-environment relationships. This study concludes that plant traits respond to climate conditions on the timescale of tissue lifespans rather than long-term climate normals, even at large spatial scales where multiple ecological and physiological mechanisms drive trait change. Thus, determining trait-environment relationships with temporally relevant climate variables may be critical for predicting trait change in a nonstationary climate system.
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Affiliation(s)
| | - Matthew Worden
- Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA
| | - Leander D L Anderegg
- Department of Ecology, Evolution, & Marine Biology, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Alexandra G Konings
- Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA
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5
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Li D, An L, Zhong S, Shen L, Wu S. Declining coupling between vegetation and drought over the past three decades. GLOBAL CHANGE BIOLOGY 2024; 30:e17141. [PMID: 38273520 DOI: 10.1111/gcb.17141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/10/2023] [Accepted: 12/19/2023] [Indexed: 01/27/2024]
Abstract
Droughts have been implicated as the main driver behind recent vegetation die-off and are projected to drive greater mortality under future climate change. Understanding the coupling relationship between vegetation and drought has been of great global interest. Currently, the coupling relationship between vegetation and drought is mainly evaluated by correlation coefficients or regression slopes. However, the optimal drought timescale of vegetation response to drought, as a key indicator reflecting vegetation sensitivity to drought, has largely been ignored. Here, we apply the optimal drought timescale identification method to examine the change in coupling between vegetation and drought over the past three decades (1982-2015) with long-term satellite-derived Normalized Difference Vegetation Index and Standardized Precipitation-Evapotranspiration Index data. We find substantial increasing response of vegetation to drought timescales globally, and the correlation coefficient between vegetation and drought under optimal drought timescale overall declines between 1982 and 2015. This decrease in vegetation-drought coupling is mainly observed in regions with water deficit, although its initial correlation is relatively high. However, vegetation in water-surplus regions, with low coupling in earlier stages, is prone to show an increasing trend. The observed changes may be driven by the increasing trend of atmospheric CO2 . Our findings highlight more pressing drought risk in water-surplus regions than in water-deficit regions, which advances our understanding of the long-term vegetation-drought relationship and provides essential insights for mapping future vegetation sensitivity to drought under changing climate conditions.
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Affiliation(s)
- Delong Li
- Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Li An
- Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Shuai Zhong
- Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Lei Shen
- Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC, Islamabad, Pakistan
- Key Laboratory of Carrying Capacity Assessment for Resource and Environment, Ministry of Natural Resources of the People's Republic of China, Beijing, China
| | - Shuyao Wu
- Center for Yellow River Ecosystem Products, Shandong University, Qingdao, Shandong, China
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6
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Wang X, Xu T, Xu C, Liu H, Chen Z, Li Z, Li X, Wu X. Enhanced growth resistance but no decline in growth resilience under long-term extreme droughts. GLOBAL CHANGE BIOLOGY 2024; 30:e17038. [PMID: 37987223 DOI: 10.1111/gcb.17038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 10/19/2023] [Accepted: 10/29/2023] [Indexed: 11/22/2023]
Abstract
The frequency, intensity, and duration of extreme droughts, with devastating impacts on tree growth and survival, have increased with climate change over the past decades. Assessing growth resistance and resilience to drought is a crucial prerequisite for understanding the responses of forest functioning to drought events. However, the responses of growth resistance and resilience to extreme droughts with different durations across different climatic zones remain unclear. Here, we investigated the spatiotemporal patterns in growth resistance and resilience in response to extreme droughts with different durations during 1901-2015, relying on tree-ring chronologies from 2389 forest stands over the mid- and high-latitudinal Northern Hemisphere, species-specific plant functional traits, and diverse climatic factors. The findings revealed that growth resistance and resilience under 1-year droughts were higher in humid regions than in arid regions. Significant higher growth resistance was observed under 2-year droughts than under 1-year droughts in both arid and humid regions, while growth resilience did not show a significant difference. Temporally, tree growth became less resistant and resilient to 1-year droughts in 1980-2015 than in 1901-1979 in both arid and humid regions. As drought duration lengthened, the predominant impacts of climatic factors on growth resistance and resilience weakened and instead foliar economic traits, plant hydraulic traits, and soil properties became much more important in both climatic regions; in addition, such trends were also observed temporally. Finally, we found that most of the Earth system models (ESMs) used in this study overestimated growth resistance and underestimated growth resilience under both 1-year and 2-year droughts. A comprehensive ecophysiological understanding of tree growth responses to longer and intensified drought events is urgently needed, and a specific emphasis should be placed on improving the performance of ESMs.
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Affiliation(s)
- Xiaona Wang
- State Key Laboratory of Earth Surface Processes and Resources Ecology, Beijing Normal University, Beijing, China
- Faculty of Geographical Science, Beijing Normal University, Beijing, China
| | - Taoran Xu
- State Key Laboratory of Earth Surface Processes and Resources Ecology, Beijing Normal University, Beijing, China
- Faculty of Geographical Science, Beijing Normal University, Beijing, China
| | - Chenxi Xu
- Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
| | - Hongyan Liu
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Zhenju Chen
- Tree-Ring Laboratory, Research Station of Liaohe-River Plain Forest Ecosystem CFERN, College of Forestry, Shenyang Agricultural University, Shenyang, China
| | - Zongshan Li
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
| | - Ximeng Li
- College of Life and Environmental Science, Minzu University of China, Beijing, China
| | - Xiuchen Wu
- State Key Laboratory of Earth Surface Processes and Resources Ecology, Beijing Normal University, Beijing, China
- Faculty of Geographical Science, Beijing Normal University, Beijing, China
- Academy of Plateau Science and Sustainability, People's Government of Qinghai Province & Beijing Normal University, Xining, China
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7
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Huang J, Yu R, Zang R. Differences in functional niche hypervolume among four types of forest vegetation and their environmental determinants across various climatic regions in China. FRONTIERS IN PLANT SCIENCE 2023; 14:1243209. [PMID: 38116149 PMCID: PMC10728642 DOI: 10.3389/fpls.2023.1243209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 11/23/2023] [Indexed: 12/21/2023]
Abstract
Functional traits play an important role in studying the functional niche in plant communities. However, it remains unclear whether the functional niches of typical forest plant communities in different climatic regions based on functional traits are consistent. Here, we present data for 215 woody species, encompassing 11 functional traits related to three fundamental niche dimensions (leaf economy, mechanical support, and reproductive phenology). These data were collected from forests across four climatic zones in China (tropical, subtropical, warm-temperate, and cold-temperate) or sourced from the literature. We calculated the functional niche hypervolume, representing the range of changes in the multidimensional functional niche. This metric quantifies how many functional niche spaces are occupied by existing plants in the community. Subsequently, we analyzed differences in functional niche hypervolume and their associated environmental factors across different types of forest vegetation. The results indicate that the functional niche hypervolume and the degree of forest vegetation overlap decrease with increasing latitude (e.g., from tropical rainforest to cold temperate coniferous forest). The total explanatory power of both climate and soil factors on the variation in functional niche hypervolume was 50%, with climate factors exhibiting a higher explanatory power than soil factors. Functional niche hypervolume is positively correlated with climate factors (annual mean temperature and annual precipitation) and negatively correlated with soil factors (soil pH, soil organic matter content, soil total nitrogen content, and soil total phosphorus content). Among these factors, annual mean temperature, soil pH, and soil total nitrogen content most significantly affect the difference in functional niche hypervolume among forest vegetation. Our study emphasizes the significant variation in the functional niche hypervolume among typical forest vegetation in China.
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Affiliation(s)
- Jihong Huang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
| | - Ruoyun Yu
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China
| | - Runguo Zang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
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8
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Wilcox KR, Chen A, Avolio ML, Butler EE, Collins S, Fisher R, Keenan T, Kiang NY, Knapp AK, Koerner SE, Kueppers L, Liang G, Lieungh E, Loik M, Luo Y, Poulter B, Reich P, Renwick K, Smith MD, Walker A, Weng E, Komatsu KJ. Accounting for herbaceous communities in process-based models will advance our understanding of "grassy" ecosystems. GLOBAL CHANGE BIOLOGY 2023; 29:6453-6477. [PMID: 37814910 DOI: 10.1111/gcb.16950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 06/01/2023] [Indexed: 10/11/2023]
Abstract
Grassland and other herbaceous communities cover significant portions of Earth's terrestrial surface and provide many critical services, such as carbon sequestration, wildlife habitat, and food production. Forecasts of global change impacts on these services will require predictive tools, such as process-based dynamic vegetation models. Yet, model representation of herbaceous communities and ecosystems lags substantially behind that of tree communities and forests. The limited representation of herbaceous communities within models arises from two important knowledge gaps: first, our empirical understanding of the principles governing herbaceous vegetation dynamics is either incomplete or does not provide mechanistic information necessary to drive herbaceous community processes with models; second, current model structure and parameterization of grass and other herbaceous plant functional types limits the ability of models to predict outcomes of competition and growth for herbaceous vegetation. In this review, we provide direction for addressing these gaps by: (1) presenting a brief history of how vegetation dynamics have been developed and incorporated into earth system models, (2) reporting on a model simulation activity to evaluate current model capability to represent herbaceous vegetation dynamics and ecosystem function, and (3) detailing several ecological properties and phenomena that should be a focus for both empiricists and modelers to improve representation of herbaceous vegetation in models. Together, empiricists and modelers can improve representation of herbaceous ecosystem processes within models. In so doing, we will greatly enhance our ability to forecast future states of the earth system, which is of high importance given the rapid rate of environmental change on our planet.
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Affiliation(s)
- Kevin R Wilcox
- University of North Carolina Greensboro, Greensboro, North Carolina, USA
- University of Wyoming, Laramie, Wyoming, USA
| | - Anping Chen
- Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, Colorado, USA
| | - Meghan L Avolio
- Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland, USA
| | - Ethan E Butler
- Department of Forest Resources, University of Minnesota, St. Paul, Minnesota, USA
| | - Scott Collins
- Department of Biology, University of New Mexico, Albuquerque, New Mexico, USA
| | - Rosie Fisher
- CICERO Centre for International Cimate Research, Forskningsparken, Oslo, Norway
| | - Trevor Keenan
- Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Nancy Y Kiang
- NASA Goddard Institute for Space Studies, New York, New York, USA
| | - Alan K Knapp
- Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, Colorado, USA
| | - Sally E Koerner
- University of North Carolina Greensboro, Greensboro, North Carolina, USA
| | - Lara Kueppers
- Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Guopeng Liang
- Department of Forest Resources, University of Minnesota, St. Paul, Minnesota, USA
| | - Eva Lieungh
- Natural History Museum, University of Oslo, Oslo, Norway
| | - Michael Loik
- Department of Environmental Studies, University of California, Santa Cruz, California, USA
| | - Yiqi Luo
- School of Integrative Plant Science, Cornell University, Ithaca, New York, USA
| | - Ben Poulter
- Biospheric Sciences Lab, NASA GSFC, Greenbelt, Maryland, USA
| | - Peter Reich
- Department of Forest Resources, University of Minnesota, St. Paul, Minnesota, USA
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, New South Wales, Australia
| | | | - Melinda D Smith
- Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, Colorado, USA
| | - Anthony Walker
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
| | - Ensheng Weng
- NASA Goddard Institute for Space Studies, New York, New York, USA
- Center for Climate Systems Research, Columbia University, New York, New York, USA
| | - Kimberly J Komatsu
- University of North Carolina Greensboro, Greensboro, North Carolina, USA
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9
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Miraglio T, Coops NC, Wallis CIB, Crofts AL, Kalacska M, Vellend M, Serbin SP, Arroyo-Mora JP, Laliberté E. Mapping canopy traits over Québec using airborne and spaceborne imaging spectroscopy. Sci Rep 2023; 13:17179. [PMID: 37821515 PMCID: PMC10567784 DOI: 10.1038/s41598-023-44384-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 10/07/2023] [Indexed: 10/13/2023] Open
Abstract
The advent of new spaceborne imaging spectrometers offers new opportunities for ecologists to map vegetation traits at global scales. However, to date most imaging spectroscopy studies exploiting satellite spectrometers have been constrained to the landscape scale. In this paper we present a new method to map vegetation traits at the landscape scale and upscale trait maps to the continental level, using historical spaceborne imaging spectroscopy (Hyperion) to derive estimates of leaf mass per area, nitrogen, and carbon concentrations of forests in Québec, Canada. We compare estimates for each species with reference field values and obtain good agreement both at the landscape and continental scales, with patterns consistent with the leaf economic spectrum. By exploiting the Hyperion satellite archive to map these traits and successfully upscale the estimates to the continental scale, we demonstrate the great potential of recent and upcoming spaceborne spectrometers to benefit plant biodiversity monitoring and conservation efforts.
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Affiliation(s)
- Thomas Miraglio
- Integrated Remote Sensing Studio, Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada.
| | - Nicholas C Coops
- Integrated Remote Sensing Studio, Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada
| | | | - Anna L Crofts
- Département de Biologie, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Margaret Kalacska
- Applied Remote Sensing Lab, Department of Geography, McGill University, Montréal, QC, H3A 0G4, Canada
| | - Mark Vellend
- Département de Biologie, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Shawn P Serbin
- Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Juan Pablo Arroyo-Mora
- Flight Research Laboratory, National Research Council of Canada, Ottawa, ON, K1A 0R6, Canada
| | - Etienne Laliberté
- Département de Sciences Biologiques, Institut de Recherche en Biologie Végétale, Université de Montréal, Montréal, QC, H3A 0G4, Canada
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10
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Chen Y, Wang J, Jiang L, Li H, Wang H, Lv G, Li X. Prediction of spatial distribution characteristics of ecosystem functions based on a minimum data set of functional traits of desert plants. FRONTIERS IN PLANT SCIENCE 2023; 14:1131778. [PMID: 37332722 PMCID: PMC10272538 DOI: 10.3389/fpls.2023.1131778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 05/10/2023] [Indexed: 06/20/2023]
Abstract
The relationship between plant functional traits and ecosystem function is a hot topic in current ecological research, and community-level traits based on individual plant functional traits play important roles in ecosystem function. In temperate desert ecosystems, which functional trait to use to predict ecosystem function is an important scientific question. In this study, the minimum data sets of functional traits of woody (wMDS) and herbaceous (hMDS) plants were constructed and used to predict the spatial distribution of C, N, and P cycling in ecosystems. The results showed that the wMDS included plant height, specific leaf area, leaf dry weight, leaf water content, diameter at breast height (DBH), leaf width, and leaf thickness, and the hMDS included plant height, specific leaf area, leaf fresh weight, leaf length, and leaf width. The linear regression results based on the cross-validations (FTEIW - L, FTEIA - L, FTEIW - NL, and FTEIA - NL) for the MDS and TDS (total data set) showed that the R2 (coefficients of determination) for wMDS were 0.29, 0.34, 0.75, and 0.57, respectively, and those for hMDS were 0.82, 0.75, 0.76, and 0.68, respectively, proving that the MDSs can replace the TDS in predicting ecosystem function. Then, the MDSs were used to predict the C, N, and P cycling in the ecosystem. The results showed that non-linear models RF and BPNN were able to predict the spatial distributions of C, N and P cycling, and the distributions showed inconsistent patterns between different life forms under moisture restrictions. The C, N, and P cycling showed strong spatial autocorrelation and were mainly influenced by structural factors. Based on the non-linear models, the MDSs can be used to accurately predict the C, N, and P cycling, and the predicted values of woody plant functional traits visualized by regression kriging were closer to the kriging results based on raw values. This study provides a new perspective for exploring the relationship between biodiversity and ecosystem function.
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Affiliation(s)
- Yudong Chen
- College of Ecology and Environment, Xinjiang University, Urumqi, China
- Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe, China
| | - Jinlong Wang
- College of Ecology and Environment, Xinjiang University, Urumqi, China
- Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe, China
| | - Lamei Jiang
- College of Ecology and Environment, Xinjiang University, Urumqi, China
- Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe, China
| | - Hanpeng Li
- College of Ecology and Environment, Xinjiang University, Urumqi, China
- Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe, China
| | - Hengfang Wang
- College of Ecology and Environment, Xinjiang University, Urumqi, China
- Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe, China
| | - Guanghui Lv
- College of Ecology and Environment, Xinjiang University, Urumqi, China
- Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe, China
| | - Xiaotong Li
- College of Ecology and Environment, Xinjiang University, Urumqi, China
- Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe, China
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11
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Huang X, Lu Z, Xu X, Wan F, Liao J, Wang J. Global distributions of foliar nitrogen and phosphorus resorption in forest ecosystems. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 871:162075. [PMID: 36758701 DOI: 10.1016/j.scitotenv.2023.162075] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 01/23/2023] [Accepted: 02/03/2023] [Indexed: 06/18/2023]
Abstract
Nutrient resorption is an important mechanism for nutrient conservation and can maintain ecosystem stoichiometry. Here, we examined the global-scale variation of nitrogen resorption efficiency (NRE) and phosphorus resorption efficiency (PRE) by analyzing observations from 218 published papers. We used Pagel's λ to test the phylogenetic limitation on NRE and PRE and applied the random forest model to assess biotic and abiotic drivers, which included climate, soil, species characteristics, and topographical factors, and predicted the global NRE and PRE distributions. We found that NRE and PRE had oppositing trends among climatic zones, plant functional groups, and foliar nitrogen (N) to phosphorus (P) ratios. Nutrient resorption was higher in ectomycorrhizal trees than in arbuscular mycorrhizal trees. Moreover, foliar NRE and PRE were not linked to phylogeny. On average, the random forest overall explained 38 % (21 %-55 %) variation in NRE and 36 % (16 %-55 %) variation in PRE. Both NRE and PRE varied greatly with climate and soil organic carbon (SOC). The spatial variation of NRE and PRE was coupled to N-limitation and P-limitation, respectively. Our evaluation of the factors that influenced NRE and PRE and their global distributions, and our novel approach for evaluating plant utilization of nutrients, advances our understanding of the relative stability of ecosystem randomness in forest ecosystems and the global forest nutrient cycle.
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Affiliation(s)
- Xingzhao Huang
- School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036, Anhui, China
| | - Zhouying Lu
- School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036, Anhui, China
| | - Xiaoniu Xu
- School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036, Anhui, China
| | - Fangfang Wan
- School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036, Anhui, China
| | - Jiaqiang Liao
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Jinsong Wang
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
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12
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Famiglietti CA, Worden M, Quetin GR, Smallman TL, Dayal U, Bloom AA, Williams M, Konings AG. Global net biome CO 2 exchange predicted comparably well using parameter-environment relationships and plant functional types. GLOBAL CHANGE BIOLOGY 2023; 29:2256-2273. [PMID: 36560840 DOI: 10.1111/gcb.16574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 12/13/2022] [Indexed: 05/28/2023]
Abstract
Accurate estimation and forecasts of net biome CO2 exchange (NBE) are vital for understanding the role of terrestrial ecosystems in a changing climate. Prior efforts to improve NBE predictions have predominantly focused on increasing models' structural realism (and thus complexity), but parametric error and uncertainty are also key determinants of model skill. Here, we investigate how different parameterization assumptions propagate into NBE prediction errors across the globe, pitting the traditional plant functional type (PFT)-based approach against a novel top-down, machine learning-based "environmental filtering" (EF) approach. To do so, we simulate these contrasting methods for parameter assignment within a flexible model-data fusion framework of the terrestrial carbon cycle (CARDAMOM) at a global scale. In the PFT-based approach, model parameters from a small number of select locations are applied uniformly within regions sharing similar land cover characteristics. In the EF-based approach, a pixel's parameters are predicted based on underlying relationships with climate, soil, and canopy properties. To isolate the role of parametric from structural uncertainty in our analysis, we benchmark the resulting PFT-based and EF-based NBE predictions with estimates from CARDAMOM's Bayesian optimization approach (whereby "true" parameters consistent with a suite of data constraints are retrieved on a pixel-by-pixel basis). When considering the mean absolute error of NBE predictions across time, we find that the EF-based approach matches or outperforms the PFT-based approach at 55% of pixels-a narrow majority. However, NBE estimates from the EF-based approach are susceptible to compensation between errors in component flux predictions and predicted parameters can align poorly with the assumed "true" values. Overall, though, the EF-based approach is comparable to conventional approaches and merits further investigation to better understand and resolve these limitations. This work provides insight into the relationship between terrestrial biosphere model performance and parametric uncertainty, informing efforts to improve model parameterization via PFT-free and trait-based approaches.
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Affiliation(s)
| | - Matthew Worden
- Department of Earth System Science, Stanford University, Stanford, California, USA
| | - Gregory R Quetin
- Department of Geography, University of California at Santa Barbara, Santa Barbara, California, USA
| | - T Luke Smallman
- School of GeoSciences and National Centre for Earth Observation, University of Edinburgh, Edinburgh, UK
| | - Uma Dayal
- Department of Earth System Science, Stanford University, Stanford, California, USA
| | - A Anthony Bloom
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
| | - Mathew Williams
- School of GeoSciences and National Centre for Earth Observation, University of Edinburgh, Edinburgh, UK
| | - Alexandra G Konings
- Department of Earth System Science, Stanford University, Stanford, California, USA
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13
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Kambach S, Sabatini FM, Attorre F, Biurrun I, Boenisch G, Bonari G, Čarni A, Carranza ML, Chiarucci A, Chytrý M, Dengler J, Garbolino E, Golub V, Güler B, Jandt U, Jansen J, Jašková A, Jiménez-Alfaro B, Karger DN, Kattge J, Knollová I, Midolo G, Moeslund JE, Pielech R, Rašomavičius V, Rūsiņa S, Šibík J, Stančić Z, Stanisci A, Svenning JC, Yamalov S, Zimmermann NE, Bruelheide H. Climate-trait relationships exhibit strong habitat specificity in plant communities across Europe. Nat Commun 2023; 14:712. [PMID: 36759605 PMCID: PMC9911725 DOI: 10.1038/s41467-023-36240-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 01/20/2023] [Indexed: 02/11/2023] Open
Abstract
Ecological theory predicts close relationships between macroclimate and functional traits. Yet, global climatic gradients correlate only weakly with the trait composition of local plant communities, suggesting that important factors have been ignored. Here, we investigate the consistency of climate-trait relationships for plant communities in European habitats. Assuming that local factors are better accounted for in more narrowly defined habitats, we assigned > 300,000 vegetation plots to hierarchically classified habitats and modelled the effects of climate on the community-weighted means of four key functional traits using generalized additive models. We found that the predictive power of climate increased from broadly to narrowly defined habitats for specific leaf area and root length, but not for plant height and seed mass. Although macroclimate generally predicted the distribution of all traits, its effects varied, with habitat-specificity increasing toward more narrowly defined habitats. We conclude that macroclimate is an important determinant of terrestrial plant communities, but future predictions of climatic effects must consider how habitats are defined.
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Affiliation(s)
- Stephan Kambach
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany. .,German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Leipzig, Germany.
| | - Francesco Maria Sabatini
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany.,German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Leipzig, Germany.,BIOME Lab, Department of Biological, Geological and Environmental Sciences (BiGeA), Alma Mater Studiorum University of Bologna, Bologna, Italy.,Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague - Suchdol, Czech Republic
| | - Fabio Attorre
- Department of Environmental Biology, Sapienza University of Rome, Roma, Italy
| | - Idoia Biurrun
- Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, Bilbao, Spain
| | | | - Gianmaria Bonari
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Andraž Čarni
- Research Centre of the Slovenian Academy of Sciences and Arts, Jovan Hadži Institute of Biology, ZRC-SAZU, Ljubljana, Slovenia.,University of Nova Gorica, School for Viticulture and Enology, Nova Gorica, Slovenia
| | - Maria Laura Carranza
- Envixlab, Department of Biosciences and Territory, University of Molise, Pesche, Italy
| | - Alessandro Chiarucci
- BIOME Lab, Department of Biological, Geological and Environmental Sciences (BiGeA), Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Milan Chytrý
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Jürgen Dengler
- Vegetation Ecology Research Group, Institute of Natural Resource Sciences (IUNR), Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland.,Plant Ecology, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Emmanuel Garbolino
- Climpact Data Science (CDS), Nova Sophia - Regus Nova, Sophia Antipolis Cedex, France
| | - Valentin Golub
- Samara Federal Research Scientific Center, Institute of Ecology of the Volga River Basin, Russian Academy of Sciences, Togliatti, Russia
| | - Behlül Güler
- Biology Education, Dokuz Eylul University, Izmir, Turkey
| | - Ute Jandt
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany.,German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Leipzig, Germany
| | - Jan Jansen
- Department of Ecology and Physiology, Faculty of Science, Radboud University, Nijmegen, the Netherlands
| | - Anni Jašková
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Borja Jiménez-Alfaro
- IMIB Biodiversity Research Institute (Univ.Oviedo-CSIC-Princ. Asturias), University of Oviedo, Oviedo, Spain
| | | | - Jens Kattge
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Leipzig, Germany.,Max Planck Institute for Biogeochemistry, Jena, Germany
| | - Ilona Knollová
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Gabriele Midolo
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | | | - Remigiusz Pielech
- Department of Forest Biodiversity, University of Agriculture in Krakow, Kraków, Poland
| | | | - Solvita Rūsiņa
- Faculty of Geography and Earth Sciences, University of Latvia, Riga, Latvia
| | - Jozef Šibík
- Institute of Botany, Plant Science and Biodiversity Center, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Zvjezdana Stančić
- Faculty of Geotechnical Engineering, University of Zagreb, Zagreb, Croatia
| | - Angela Stanisci
- Envixlab, Department of Biosciences and Territory, University of Molise, Pesche, Italy
| | - Jens-Christian Svenning
- Center for Biodiversity Dynamics in a Changing World (BIOCHANGE), Department of Biology, Aarhus University, Aarhus C, Denmark
| | - Sergey Yamalov
- Botanical Garden-Institute, Ufa Scientific Centre, Russian Academy of Sciences, Ufa, Russia
| | | | - Helge Bruelheide
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany.,German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Leipzig, Germany
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14
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Dynarski KA, Soper FM, Reed SC, Wieder WR, Cleveland CC. Patterns and controls of foliar nutrient stoichiometry and flexibility across United States forests. Ecology 2023; 104:e3909. [PMID: 36326547 DOI: 10.1002/ecy.3909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 07/02/2022] [Accepted: 09/12/2022] [Indexed: 11/06/2022]
Abstract
Plant element stoichiometry and stoichiometric flexibility strongly regulate ecosystem responses to global change. Here, we tested three potential mechanistic drivers (climate, soil nutrients, and plant taxonomy) of both using paired foliar and soil nutrient data from terrestrial forested National Ecological Observatory Network sites across the USA. We found that broad patterns of foliar nitrogen (N) and foliar phosphorus (P) are explained by different mechanisms. Plant taxonomy was an important control over all foliar nutrient stoichiometries and concentrations, especially foliar N, which was dominantly related to taxonomy and did not vary across climate or soil gradients. Despite a lack of site-level correlations between N and environment variables, foliar N exhibited intraspecific flexibility, with numerous species-specific correlations between foliar N and various environmental factors, demonstrating the variable spatial and temporal scales on which foliar chemistry and stoichiometric flexibility can manifest. In addition to plant taxonomy, foliar P and N:P ratios were also linked to soil nutrient status (extractable P) and climate, especially actual evapotranspiration rates. Our findings highlight the myriad factors that influence foliar chemistry and show that broad patterns cannot be explained by a single consistent mechanism. Furthermore, differing controls over foliar N versus P suggests that each may be sensitive to global change drivers on distinct spatial and temporal scales, potentially resulting in altered ecosystem N:P ratios that have implications for processes ranging from productivity to carbon sequestration.
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Affiliation(s)
- Katherine A Dynarski
- Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, Montana, USA
| | - Fiona M Soper
- Department of Biology and Bieler School of Environment, McGill University, Montréal, Quebec, Canada
| | - Sasha C Reed
- U.S. Geological Survey, Southwest Biological Science Center, Moab, Utah, USA
| | - William R Wieder
- Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, Colorado, USA.,Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, Colorado, USA
| | - Cory C Cleveland
- Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, Montana, USA
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15
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Wolf S, Mahecha MD, Sabatini FM, Wirth C, Bruelheide H, Kattge J, Moreno Martínez Á, Mora K, Kattenborn T. Citizen science plant observations encode global trait patterns. Nat Ecol Evol 2022; 6:1850-1859. [PMID: 36266458 DOI: 10.1038/s41559-022-01904-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 09/09/2022] [Indexed: 12/15/2022]
Abstract
Global maps of plant functional traits are essential for studying the dynamics of the terrestrial biosphere, yet the spatial distribution of trait measurements remains sparse. With the increasing popularity of species identification apps, citizen scientists contribute to growing vegetation data collections. The question emerges whether such opportunistic citizen science data can help map plant functional traits globally. Here we show that we can map global trait patterns by complementing vascular plant observations from the global citizen science project iNaturalist with measurements from the plant trait database TRY. We evaluate these maps using sPlotOpen, a global collection of vegetation plot data. Our results show high correlations between the iNaturalist- and sPlotOpen-based maps of up to 0.69 (r) and higher correlations than to previously published trait maps. As citizen science data collections continue to grow, we can expect them to play a significant role in further improving maps of plant functional traits.
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Affiliation(s)
- Sophie Wolf
- Remote Sensing Centre for Earth System Research, Leipzig University, Leipzig, Germany.
| | - Miguel D Mahecha
- Remote Sensing Centre for Earth System Research, Leipzig University, Leipzig, Germany
- Remote Sensing Centre for Earth System Research, Helmholtz Centre for Environmental Research, UFZ, Leipzig, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Francesco Maria Sabatini
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- BIOME Lab, Department of Biological, Geological and Environmental Sciences (BiGeA), Alma Mater Studiorum University of Bologna, Bologna, Italy
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Christian Wirth
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Institute of Systematic Botany and Functional Biodiversity, Leipzig University, Leipzig, Germany
- Max Planck Institute for Biogeochemistry, Jena, Germany
| | - Helge Bruelheide
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Jens Kattge
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Max Planck Institute for Biogeochemistry, Jena, Germany
| | | | - Karin Mora
- Remote Sensing Centre for Earth System Research, Leipzig University, Leipzig, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Teja Kattenborn
- Remote Sensing Centre for Earth System Research, Leipzig University, Leipzig, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
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16
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Zhao Q, Zhu Z, Zeng H, Myneni RB, Zhang Y, Peñuelas J, Piao S. Seasonal peak photosynthesis is hindered by late canopy development in northern ecosystems. NATURE PLANTS 2022; 8:1484-1492. [PMID: 36482207 DOI: 10.1038/s41477-022-01278-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 10/18/2022] [Indexed: 05/12/2023]
Abstract
The seasonal dynamics of the vegetation canopy strongly regulate the surface energy balance and terrestrial carbon fluxes, providing feedbacks to climate change. Whether the seasonal timing of maximum canopy structure was optimized to achieve a maximum photosynthetic carbon uptake is still not clear due to the complex interactions between abiotic and biotic factors. We used two solar-induced chlorophyll fluorescence datasets as proxies for photosynthesis and the normalized difference vegetation index and leaf area index products derived from the moderate resolution imaging spectroradiometer as proxies for canopy structure, to characterize the connection between their seasonal peak timings from 2000 to 2018. We found that the seasonal peak was earlier for photosynthesis than for canopy structure in >87.5% of the northern vegetated area, probably leading to a suboptimal maximum seasonal photosynthesis. This mismatch in peak timing significantly increased during the study period, mainly due to the increasing atmospheric CO2, and its spatial variation was mainly explained by climatic variables (43.7%) and nutrient limitations (29.6%). State-of-the-art ecosystem models overestimated this mismatch in peak timing by simulating a delayed seasonal peak of canopy development. These results highlight the importance of incorporating the mechanisms of vegetation canopy dynamics to accurately predict the maximum potential terrestrial uptake of carbon under global environmental change.
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Affiliation(s)
- Qian Zhao
- Institute of Carbon Neutrality, Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Zaichun Zhu
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, China.
- Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen, China.
| | - Hui Zeng
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, China
- Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen, China
| | - Ranga B Myneni
- Department of Earth and Environment, Boston University, Boston, MA, USA
| | - Yao Zhang
- Institute of Carbon Neutrality, Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Josep Peñuelas
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Barcelona, Catalonia, Spain
- CREAF, Barcelona, Catalonia, Spain
| | - Shilong Piao
- Institute of Carbon Neutrality, Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China.
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China.
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17
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Wang X, Wang R, Gao J. Precipitation and soil nutrients determine the spatial variability of grassland productivity at large scales in China. FRONTIERS IN PLANT SCIENCE 2022; 13:996313. [PMID: 36160972 PMCID: PMC9505511 DOI: 10.3389/fpls.2022.996313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 08/17/2022] [Indexed: 06/16/2023]
Abstract
Changes in net primary productivity (NPP) to global change have been studied, yet the relative impacts of global change on grassland productivity at large scales remain poorly understood. Using 182 grassland samples established in 17 alpine meadows (AM) and 21 desert steppes (DS) in China, we show that NPP of AM was significantly higher than that of DS. NPP increased significantly with increasing leaf nitrogen content (LN) and leaf phosphorus content (LP) but decreased significantly with increasing leaf dry matter content (LDMC). Among all abiotic factors, soil nutrient factor was the dominant factor affecting the variation of NPP of AM, while the NPP of DS was mainly influenced by the changing of precipitation. All abiotic factors accounted for 62.4% of the spatial variation in the NPP of AM, which was higher than the ability to explain the spatial variation in the NPP of DS (43.5%). Leaf traits together with soil nutrients and climatic factors determined the changes of the grassland productivity, but the relative contributions varied somewhat among different grassland types. We quantified the effects of biotic and abiotic factors on grassland NPP, and provided theoretical guidance for predicting the impacts of global change on the NPP of grasslands.
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Affiliation(s)
- Xianxian Wang
- College of Life Sciences, Xinjiang Normal University, Urumqi, China
| | - Ru Wang
- College of Life Sciences, Xinjiang Normal University, Urumqi, China
| | - Jie Gao
- College of Life Sciences, Xinjiang Normal University, Urumqi, China
- Institute of Ecology and Key Laboratory of Earth Surface Processes of Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing, China
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18
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Heckford TR, Leroux SJ, Vander Wal E, Rizzuto M, Balluffi-Fry J, Richmond IC, Wiersma YF. Ecoregion and community structure influences on the foliar elemental niche of balsam fir ( Abies balsamea (L.) Mill.) and white birch ( Betula papyrifera Marshall). Ecol Evol 2022; 12:e9244. [PMID: 36110871 PMCID: PMC9465200 DOI: 10.1002/ece3.9244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 06/18/2022] [Accepted: 08/01/2022] [Indexed: 11/14/2022] Open
Abstract
Changes in foliar elemental niche properties, defined by axes of carbon (C), nitrogen (N), and phosphorus (P) concentrations, reflect how species allocate resources under different environmental conditions. For instance, elemental niches may differ in response to large‐scale latitudinal temperature and precipitation regimes that occur between ecoregions and small‐scale differences in nutrient dynamics based on species co‐occurrences at a community level. At a species level, we compared foliar elemental niche hypervolumes for balsam fir (Abies balsamea (L.) Mill.) and white birch (Betula papyrifera Marshall) between a northern and southern ecoregion. At a community level, we grouped our focal species using plot data into conspecific (i.e., only one focal species is present) and heterospecific groups (i.e., both focal species are present) and compared their foliar elemental concentrations under these community conditions across, within, and between these ecoregions. Between ecoregions at the species and community level, we expected niche hypervolumes to be different and driven by regional biophysical effects on foliar N and P concentrations. At the community level, we expected niche hypervolume displacement and expansion patterns for fir and birch, respectively—patterns that reflect their resource strategy. At the species level, foliar elemental niche hypervolumes between ecoregions differed significantly for fir (F = 14.591, p‐value = .001) and birch (F = 75.998, p‐value = .001) with higher foliar N and P in the northern ecoregion. At the community level, across ecoregions, the foliar elemental niche hypervolume of birch differed significantly between heterospecific and conspecific groups (F = 4.075, p‐value = .021) but not for fir. However, both species displayed niche expansion patterns, indicated by niche hypervolume increases of 35.49% for fir and 68.92% for birch. Within the northern ecoregion, heterospecific conditions elicited niche expansion responses, indicated by niche hypervolume increases for fir of 29.04% and birch of 66.48%. In the southern ecoregion, we observed a contraction response for birch (niche hypervolume decreased by 3.66%) and no changes for fir niche hypervolume. Conspecific niche hypervolume comparisons between ecoregions yielded significant differences for fir and birch (F = 7.581, p‐value = .005 and F = 8.038, p‐value = .001) as did heterospecific comparisons (F = 6.943, p‐value = .004, and F = 68.702, p‐value = .001, respectively). Our results suggest species may exhibit biogeographical specific elemental niches—driven by biophysical differences such as those used to describe ecoregion characteristics. We also demonstrate how a species resource strategy may inform niche shift patterns in response to different community settings. Our study highlights how biogeographical differences may influence foliar elemental traits and how this may link to concepts of ecosystem and landscape functionality.
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Affiliation(s)
- Travis R Heckford
- British Columbia Government Ministry of Forests, Cariboo Natural Resource Region Williams Lake British Columbia Canada
| | - Shawn J Leroux
- Department of Biology Memorial University of Newfoundland St. John's Newfoundland and Labrador Canada
| | - Eric Vander Wal
- Department of Biology Memorial University of Newfoundland St. John's Newfoundland and Labrador Canada
| | - Matteo Rizzuto
- Department of Biology Memorial University of Newfoundland St. John's Newfoundland and Labrador Canada
| | - Juliana Balluffi-Fry
- Department of Biology Memorial University of Newfoundland St. John's Newfoundland and Labrador Canada
| | - Isabella C Richmond
- Department of Biology Memorial University of Newfoundland St. John's Newfoundland and Labrador Canada
| | - Yolanda F Wiersma
- Department of Biology Memorial University of Newfoundland St. John's Newfoundland and Labrador Canada
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19
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Ellsworth DS, Crous KY, De Kauwe MG, Verryckt LT, Goll D, Zaehle S, Bloomfield KJ, Ciais P, Cernusak LA, Domingues TF, Dusenge ME, Garcia S, Guerrieri R, Ishida FY, Janssens IA, Kenzo T, Ichie T, Medlyn BE, Meir P, Norby RJ, Reich PB, Rowland L, Santiago LS, Sun Y, Uddling J, Walker AP, Weerasinghe KWLK, van de Weg MJ, Zhang YB, Zhang JL, Wright IJ. Convergence in phosphorus constraints to photosynthesis in forests around the world. Nat Commun 2022; 13:5005. [PMID: 36008385 PMCID: PMC9411118 DOI: 10.1038/s41467-022-32545-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 08/03/2022] [Indexed: 12/02/2022] Open
Abstract
Tropical forests take up more carbon (C) from the atmosphere per annum by photosynthesis than any other type of vegetation. Phosphorus (P) limitations to C uptake are paramount for tropical and subtropical forests around the globe. Yet the generality of photosynthesis-P relationships underlying these limitations are in question, and hence are not represented well in terrestrial biosphere models. Here we demonstrate the dependence of photosynthesis and underlying processes on both leaf N and P concentrations. The regulation of photosynthetic capacity by P was similar across four continents. Implementing P constraints in the ORCHIDEE-CNP model, gross photosynthesis was reduced by 36% across the tropics and subtropics relative to traditional N constraints and unlimiting leaf P. Our results provide a quantitative relationship for the P dependence for photosynthesis for the front-end of global terrestrial C models that is consistent with canopy leaf measurements. Phosphorus (P) limitation is pervasive in tropical forests. Here the authors analyse the dependence of photosynthesis on leaf N and P in tropical forests, and show that incorporating leaf P constraints in a terrestrial biosphere model enhances its predictive power.
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Affiliation(s)
- David S Ellsworth
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.
| | - Kristine Y Crous
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia
| | - Martin G De Kauwe
- School of Biological Sciences, University of Bristol, Bristol, UK.,ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW, Australia
| | - Lore T Verryckt
- Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Daniel Goll
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Institut Pierre Simon Laplace, CEA/CNRS/Université de Versailles Saint-Quentin-en-Yvelines/ Université de Paris Saclay, Gif-sur-Yvette, France.,Lehrstuhl für Physische Geographie mit Schwerpunkt Klimaforschung, Universität Augsburg, Augsburg, Germany
| | - Sönke Zaehle
- Max Planck Institute for Biogeochemistry, Jena, Germany
| | | | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Institut Pierre Simon Laplace, CEA/CNRS/Université de Versailles Saint-Quentin-en-Yvelines/ Université de Paris Saclay, Gif-sur-Yvette, France
| | - Lucas A Cernusak
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, Australia
| | - Tomas F Domingues
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Depto. de Biologia, Universidade de São Paulo-Ribeirão Preto, Ribeirão Preto, Brazil
| | - Mirindi Eric Dusenge
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden.,College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Sabrina Garcia
- National Institute of Amazonian Research (INPA), Manaus, Brazil
| | - Rossella Guerrieri
- Department of Agricultural and Food Sciences, University of Bologna, Bologna, Italy
| | - F Yoko Ishida
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, Australia
| | - Ivan A Janssens
- Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Tanaka Kenzo
- Japan International Research Centre for Agricultural Sciences, Tsukuba, Japan
| | - Tomoaki Ichie
- Faculty of Agriculture and Marine Science, Kochi University, Kochi, Japan
| | - Belinda E Medlyn
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia
| | - Patrick Meir
- Research School of Biology, The Australian National University, Canberra, ACT, Australia.,School of Geosciences, Edinburgh University, Edinburgh, Scotland, UK
| | - Richard J Norby
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
| | - Peter B Reich
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.,Department of Forest Resources, University of Minnesota, St. Paul, MN, USA.,Institute for Global Change Biology, and School for the Environment and Sustainability, University of Michigan, Ann Arbor, MI, 48109, US
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Louis S Santiago
- Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA, USA
| | - Yan Sun
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Institut Pierre Simon Laplace, CEA/CNRS/Université de Versailles Saint-Quentin-en-Yvelines/ Université de Paris Saclay, Gif-sur-Yvette, France.,College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Johan Uddling
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Anthony P Walker
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | | | - Yun-Bing Zhang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Jiao-Lin Zhang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Ian J Wright
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.,Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
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20
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Climatic and biotic factors influencing regional declines and recovery of tropical forest biomass from the 2015/16 El Niño. Proc Natl Acad Sci U S A 2022; 119:e2101388119. [PMID: 35733266 PMCID: PMC9245643 DOI: 10.1073/pnas.2101388119] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The 2015/16 El Niño brought severe drought and record-breaking temperatures in the tropics. Here, using satellite-based L-band microwave vegetation optical depth, we mapped changes of above-ground biomass (AGB) during the drought and in subsequent years up to 2019. Over more than 60% of drought-affected intact forests, AGB reduced during the drought, except in the wettest part of the central Amazon, where it declined 1 y later. By the end of 2019, only 40% of AGB reduced intact forests had fully recovered to the predrought level. Using random-forest models, we found that the magnitude of AGB losses during the drought was mainly associated with regionally distinct patterns of soil water deficits and soil clay content. For the AGB recovery, we found strong influences of AGB losses during the drought and of [Formula: see text]. [Formula: see text] is a parameter related to canopy structure and is defined as the ratio of two relative height (RH) metrics of Geoscience Laser Altimeter System (GLAS) waveform data-RH25 (25% energy return height) and RH100 (100% energy return height; i.e., top canopy height). A high [Formula: see text] may reflect forests with a tall understory, thick and closed canopy, and/or without degradation. Such forests with a high [Formula: see text] ([Formula: see text] ≥ 0.3) appear to have a stronger capacity to recover than low-[Formula: see text] ones. Our results highlight the importance of forest structure when predicting the consequences of future drought stress in the tropics.
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21
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GriddingMachine, a database and software for Earth system modeling at global and regional scales. Sci Data 2022; 9:258. [PMID: 35650204 PMCID: PMC9160223 DOI: 10.1038/s41597-022-01346-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 05/04/2022] [Indexed: 11/09/2022] Open
Abstract
Land and Earth system modeling is moving towards more explicit biophysical representations, requiring increasing variety of datasets for initialization and benchmarking. However, researchers often have difficulties in identifying and integrating non-standardized datasets from various sources. We aim towards a standardized database and one-stop distribution method of global datasets. Here, we present the GriddingMachine as (1) a database of global-scale datasets commonly used to parameterize or benchmark the models, from plant traits to vegetation indices and geophysical information and (2) a cross-platform open source software to download and request a subset of datasets with only a few lines of code. The GriddingMachine datasets can be accessed either manually through traditional HTTP, or automatically using modern programming languages including Julia, Matlab, Octave, Python, and R. The GriddingMachine collections can be used for any land and Earth modeling framework and ecological research at the regional and global scales, and the number of datasets will continue to grow to meet the increasing needs of research communities.
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22
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Yuan Y, Bao A, Jiang P, Hamdi R, Termonia P, De Maeyer P, Guo H, Zheng G, Yu T, Prishchepov AV. Probabilistic assessment of vegetation vulnerability to drought stress in Central Asia. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 310:114504. [PMID: 35189553 DOI: 10.1016/j.jenvman.2022.114504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 01/05/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
The increasing frequency and intensity of droughts in a warming climate are likely to exacerbate adverse impacts on ecosystems, especially for water-limited regions such as Central Asia. A quantitative understanding of the impacts of drought on vegetation is required for drought preparedness and mitigation. Using the Global Inventory Modeling and Mapping Studies NDVI3g data and Standardized Precipitation Evapotranspiration Index (SPEI) from 1982 to 2015, we evaluate the vegetation vulnerability to drought in Central Asia based on a copula-based probabilistic framework and identify the critical regions and periods. Furthermore, a boosted regression trees (BRT) model was also used to explore the relative importance of environmental factors and plant traits on vegetation response to drought. Additionally, we also investigated to what extent irrigation could alleviate the impacts of drought. Results revealed that months from June to September was the critical period when vegetated areas were most vulnerable to drought stress. The probabilities of vegetation loss below 20th quantile under extremely dry in these months were 68.7%, 69.4%, 71.0%, and 67.0%, respectively. Regarding vegetation-vulnerable regions, they shifted with different growth stages. During the middle of the growing season, semi-arid areas were the most vulnerable regions, whereas the highest drought-vulnerable regions were observed in arid areas during other periods. The BRT results showed that plant traits accounted for a large fraction (58.9%) of vegetation response to drought, which was more important than ambient soil environment (20.8%). The analysis also showed that mitigations from irrigation during July to September were smaller than in other months. The results of this paper provide insight into the influences of drought on vegetation and may contribute to drought mitigation and land degradation measures in Central Asia under accelerating global warming.
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Affiliation(s)
- Ye Yuan
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Geography, Ghent University, Ghent, 9000, Belgium
| | - Anming Bao
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China; Sino-Belgian Laboratory for Geo-Information, Urumqi, 83011, China; Key Laboratory of GIS & RS Application Xinjiang Uygur Autonomous Region, Urumqi, 830011, China; China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC, Islamabad, 45320, Pakistan.
| | - Ping Jiang
- School of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Rafiq Hamdi
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China; Royal Meteorological Institute, Brussels, Belgium; Department of Physics and Astronomy, Ghent University, Ghent, Belgium
| | - Piet Termonia
- Royal Meteorological Institute, Brussels, Belgium; Department of Physics and Astronomy, Ghent University, Ghent, Belgium
| | - Philippe De Maeyer
- Department of Geography, Ghent University, Ghent, 9000, Belgium; Sino-Belgian Laboratory for Geo-Information, Ghent, 9000, Belgium
| | - Hao Guo
- School of Geography and Tourism, Qufu Normal University, Rizhao, 276800, China
| | - Guoxiong Zheng
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tao Yu
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Geography, Ghent University, Ghent, 9000, Belgium
| | - Alexander V Prishchepov
- Department of Geosciences and NaturalResource Management (IGN), University of Copenhagen, København K, 1350, Denmark; Department of Theoretical Cybernetics and Applied Mathematics, Institute of Mathematics and Information Technologies, Altai State University, Lenina 61, 656049, Barnaul, Russia
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23
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Gao J, Wang K, Zhang X. Patterns and drivers of community specific leaf area in China. Glob Ecol Conserv 2022. [DOI: 10.1016/j.gecco.2021.e01971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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24
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Joswig JS, Wirth C, Schuman MC, Kattge J, Reu B, Wright IJ, Sippel SD, Rüger N, Richter R, Schaepman ME, van Bodegom PM, Cornelissen JHC, Díaz S, Hattingh WN, Kramer K, Lens F, Niinemets Ü, Reich PB, Reichstein M, Römermann C, Schrodt F, Anand M, Bahn M, Byun C, Campetella G, Cerabolini BEL, Craine JM, Gonzalez-Melo A, Gutiérrez AG, He T, Higuchi P, Jactel H, Kraft NJB, Minden V, Onipchenko V, Peñuelas J, Pillar VD, Sosinski Ê, Soudzilovskaia NA, Weiher E, Mahecha MD. Climatic and soil factors explain the two-dimensional spectrum of global plant trait variation. Nat Ecol Evol 2022; 6:36-50. [PMID: 34949824 PMCID: PMC8752441 DOI: 10.1038/s41559-021-01616-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 11/10/2021] [Indexed: 11/09/2022]
Abstract
Plant functional traits can predict community assembly and ecosystem functioning and are thus widely used in global models of vegetation dynamics and land-climate feedbacks. Still, we lack a global understanding of how land and climate affect plant traits. A previous global analysis of six traits observed two main axes of variation: (1) size variation at the organ and plant level and (2) leaf economics balancing leaf persistence against plant growth potential. The orthogonality of these two axes suggests they are differently influenced by environmental drivers. We find that these axes persist in a global dataset of 17 traits across more than 20,000 species. We find a dominant joint effect of climate and soil on trait variation. Additional independent climate effects are also observed across most traits, whereas independent soil effects are almost exclusively observed for economics traits. Variation in size traits correlates well with a latitudinal gradient related to water or energy limitation. In contrast, variation in economics traits is better explained by interactions of climate with soil fertility. These findings have the potential to improve our understanding of biodiversity patterns and our predictions of climate change impacts on biogeochemical cycles.
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Affiliation(s)
- Julia S. Joswig
- grid.419500.90000 0004 0491 7318Max-Planck-Institute for Biogeochemistry, Jena, Germany ,grid.7400.30000 0004 1937 0650Remote Sensing Laboratories, Department of Geography, University of Zurich, Zurich, Switzerland
| | - Christian Wirth
- grid.419500.90000 0004 0491 7318Max-Planck-Institute for Biogeochemistry, Jena, Germany ,grid.9647.c0000 0004 7669 9786German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany ,grid.9647.c0000 0004 7669 9786Institute of Systematic Botany and Functional Biodiversity, University of Leipzig, Leipzig, Germany
| | - Meredith C. Schuman
- grid.7400.30000 0004 1937 0650Remote Sensing Laboratories, Department of Geography, University of Zurich, Zurich, Switzerland ,grid.7400.30000 0004 1937 0650Department of Chemistry, University of Zurich, Zurich, Switzerland
| | - Jens Kattge
- grid.419500.90000 0004 0491 7318Max-Planck-Institute for Biogeochemistry, Jena, Germany ,grid.9647.c0000 0004 7669 9786German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany
| | - Björn Reu
- grid.411595.d0000 0001 2105 7207Escuela de Biología, Universidad Industrial de Santander, Bucaramanga, Colombia
| | - Ian J. Wright
- grid.1004.50000 0001 2158 5405Department of Biological Sciences, Macquarie University, Sydney, New South Wales Australia
| | - Sebastian D. Sippel
- grid.5801.c0000 0001 2156 2780Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland ,grid.454322.60000 0004 4910 9859Norwegian Institute of Bioeconomy Research, Oslo, Norway
| | - Nadja Rüger
- grid.9647.c0000 0004 7669 9786German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany ,grid.9647.c0000 0004 7669 9786Department of Economics, University of Leipzig, Leipzig, Germany ,grid.438006.90000 0001 2296 9689Smithsonian Tropical Research Institute, Ancón, Panama
| | - Ronny Richter
- grid.9647.c0000 0004 7669 9786German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany ,grid.9647.c0000 0004 7669 9786Institute of Systematic Botany and Functional Biodiversity, University of Leipzig, Leipzig, Germany ,grid.9647.c0000 0004 7669 9786Geoinformatics and Remote Sensing, Institute for Geography, University of Leipzig, Leipzig, Germany
| | - Michael E. Schaepman
- grid.7400.30000 0004 1937 0650Remote Sensing Laboratories, Department of Geography, University of Zurich, Zurich, Switzerland
| | - Peter M. van Bodegom
- grid.5132.50000 0001 2312 1970Environmental Biology Department, Institute of Environmental Sciences, CML, Leiden University, Leiden, the Netherlands
| | - J. H. C. Cornelissen
- grid.12380.380000 0004 1754 9227Systems Ecology, Department of Ecological Science, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Sandra Díaz
- grid.10692.3c0000 0001 0115 2557Instituto Multidisciplinario de Biología Vegetal (IMBIV), CONICET and FCEFyN, Universidad Nacional de Córdoba, Córdoba, Argentina
| | | | - Koen Kramer
- grid.4818.50000 0001 0791 5666Chairgroup Forest Ecology and Forest Management, Wageningen University, Wageningen, the Netherlands ,Land Life Company, Amsterdam, the Netherlands
| | - Frederic Lens
- grid.425948.60000 0001 2159 802XResearch Group Functional Traits, Naturalis Biodiversity Center, Leiden, the Netherlands ,grid.5132.50000 0001 2312 1970Plant Sciences, Institute of Biology Leiden, Leiden University, Leiden, the Netherlands
| | - Ülo Niinemets
- grid.16697.3f0000 0001 0671 1127Estonian University of Life Sciences, Tartu, Estonia
| | - Peter B. Reich
- grid.17635.360000000419368657Department of Forest Resources, University of Minnesota, St Paul, MN USA ,grid.1029.a0000 0000 9939 5719Hawkesbury Institute for the Environment, Western Sydney University, Penrith, New South Wales Australia ,grid.214458.e0000000086837370Institute for Global Change Biology and School for Environment and Sustainability, University of Michigan, Ann Arbor, MI USA
| | - Markus Reichstein
- grid.419500.90000 0004 0491 7318Max-Planck-Institute for Biogeochemistry, Jena, Germany ,grid.9647.c0000 0004 7669 9786German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany
| | - Christine Römermann
- grid.9647.c0000 0004 7669 9786German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany ,grid.9613.d0000 0001 1939 2794Department of Plant Biodiversity, Institute of Ecology and Evolution, Friedrich-Schiller University, Jena, Germany
| | - Franziska Schrodt
- grid.4563.40000 0004 1936 8868School of Geography, University of Nottingham, Nottingham, UK
| | - Madhur Anand
- grid.34429.380000 0004 1936 8198School of Environmental Sciences, University of Guelph, Guelph, Canada
| | - Michael Bahn
- grid.5771.40000 0001 2151 8122Department of Ecology, University of Innsbruck, Innsbruck, Austria
| | - Chaeho Byun
- grid.252211.70000 0001 2299 2686Department of Biological Sciences and Biotechnology, Andong National University, Andong, Korea
| | - Giandiego Campetella
- grid.5602.10000 0000 9745 6549Plant Diversity and Ecosystems Management Unit, School of Biosciences and Veterinary Medicine, University of Camerino, Camerino, Italy
| | - Bruno E. L. Cerabolini
- grid.18147.3b0000000121724807Department of Biotechnologies and Life Sciences (DBSV), University of Insubria, Varese, Italy
| | | | - Andres Gonzalez-Melo
- grid.412191.e0000 0001 2205 5940Facultad de Ciencias Naturales y Matemáticas, Universidad del Rosario, Bogotá, Colombia
| | - Alvaro G. Gutiérrez
- grid.443909.30000 0004 0385 4466Departamento de Ciencias Ambientales y Recursos Naturales Renovables, Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile
| | - Tianhua He
- grid.1032.00000 0004 0375 4078School of Molecular and Life Sciences, Curtin University, Perth, Western Australia Australia ,grid.1025.60000 0004 0436 6763College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Western Australia Australia
| | - Pedro Higuchi
- grid.412287.a0000 0001 2150 7271Department of Forestry, Universidade do Estado de Santa, Catarina, Lages, Brazil
| | - Hervé Jactel
- grid.508391.60000 0004 0622 9359INRAE University Bordeaux, BIOGECO, Cestas, France
| | - Nathan J. B. Kraft
- grid.19006.3e0000 0000 9632 6718Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA USA
| | - Vanessa Minden
- grid.8767.e0000 0001 2290 8069Department of Biology, Vrije Universiteit Brussel, Brussels, Belgium ,grid.5560.60000 0001 1009 3608Landscape Ecology Group, Institute of Biology and Environmental Sciences, University of Oldenburg, Oldenburg, Germany
| | - Vladimir Onipchenko
- grid.14476.300000 0001 2342 9668Department of Ecology and Plant Geography, Moscow State Lomonosov University, Moscow, Russia
| | - Josep Peñuelas
- grid.4711.30000 0001 2183 4846CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Spain ,grid.452388.00000 0001 0722 403XCREAF, Cerdanyola del Vallés, Spain
| | - Valério D. Pillar
- grid.8532.c0000 0001 2200 7498Department of Ecology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Ênio Sosinski
- grid.460200.00000 0004 0541 873XEmbrapa Recursos Genéticos e Biotecnologia, Brasília, Brazil
| | - Nadejda A. Soudzilovskaia
- grid.12155.320000 0001 0604 5662Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium ,grid.5132.50000 0001 2312 1970Institute of Environmental Sciences, Leiden University, Leiden, the Netherlands
| | - Evan Weiher
- grid.267460.10000 0001 2227 2494Department of Biology, University of Wisconsin, Eau Claire, WI USA
| | - Miguel D. Mahecha
- grid.9647.c0000 0004 7669 9786German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany ,grid.9647.c0000 0004 7669 9786Remote Sensing Centre for Earth System Research, University of Leipzig, Leipzig, Germany ,grid.7492.80000 0004 0492 3830Helmholtz Centre for Environmental Research, Leipzig, Germany
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25
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Vallicrosa H, Sardans J, Maspons J, Zuccarini P, Fernández-Martínez M, Bauters M, Goll DS, Ciais P, Obersteiner M, Janssens IA, Peñuelas J. Global maps and factors driving forest foliar elemental composition: the importance of evolutionary history. THE NEW PHYTOLOGIST 2022; 233:169-181. [PMID: 34614196 DOI: 10.1111/nph.17771] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 09/19/2021] [Indexed: 06/13/2023]
Abstract
Consistent information on the current elemental composition of vegetation at global scale and the variables that determine it is lacking. To fill this gap, we gathered a total of 30 912 georeferenced records on woody plants foliar concentrations of nitrogen (N), phosphorus (P) and potassium (K) from published databases, and produced global maps of foliar N, P and K concentrations for woody plants using neural networks at a resolution of 1 km2 . We used data for climate, atmospheric deposition, soil and morphoclimatic groups to train the neural networks. Foliar N, P and K do not follow clear global latitudinal patterns but are consistent with the hypothesis of soil substrate age. We additionally built generalized linear mixed models to investigate the evolutionary history effect together with the effects of environmental effects. In this comparison, evolutionary history effects explained most of the variability in all cases (mostly > 60%). These results emphasize the determinant role of evolutionary history in foliar elemental composition, which should be incorporated in upcoming dynamic global vegetation models.
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Affiliation(s)
- Helena Vallicrosa
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Catalonia, 08913, Spain
- CREAF, Cerdanyola del Vallès, Catalonia, 08913, Spain
| | - Jordi Sardans
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Catalonia, 08913, Spain
- CREAF, Cerdanyola del Vallès, Catalonia, 08913, Spain
| | - Joan Maspons
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Catalonia, 08913, Spain
- CREAF, Cerdanyola del Vallès, Catalonia, 08913, Spain
| | - Paolo Zuccarini
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Catalonia, 08913, Spain
- CREAF, Cerdanyola del Vallès, Catalonia, 08913, Spain
| | - Marcos Fernández-Martínez
- Research Group PLECO (Plants and Ecosystems), Department of Biology, University of Antwerp, Wilrijk, B-2610, Belgium
| | - Marijn Bauters
- Research Group PLECO (Plants and Ecosystems), Department of Biology, University of Antwerp, Wilrijk, B-2610, Belgium
| | | | | | - Michael Obersteiner
- Ecosystems Services and Management, International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, Laxenburg, A-2361, Austria
| | - Ivan A Janssens
- Research Group PLECO (Plants and Ecosystems), Department of Biology, University of Antwerp, Wilrijk, B-2610, Belgium
| | - Josep Peñuelas
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Catalonia, 08913, Spain
- CREAF, Cerdanyola del Vallès, Catalonia, 08913, Spain
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Sheng M, Tang J, Yang D, Fisher JB, Wang H, Kattge J. Long-term leaf C:N ratio change under elevated CO 2 and nitrogen deposition in China: Evidence from observations and process-based modeling. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 800:149591. [PMID: 34399345 DOI: 10.1016/j.scitotenv.2021.149591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 07/25/2021] [Accepted: 08/07/2021] [Indexed: 06/13/2023]
Abstract
Climate change, elevating atmosphere CO2 (eCO2) and increased nitrogen deposition (iNDEP) are altering the biogeochemical interactions between plants, microbes and soils, which further modify plant leaf carbon‑nitrogen (C:N) stoichiometry and their carbon assimilation capability. Many field experiments have observed large sensitivity of leaf C:N ratio to eCO2 and iNDEP. However, the large-scale pattern of this sensitivity is still unclear, because eCO2 and iNDEP drive leaf C:N ratio toward opposite directions, which are further compounded by the complex processes of nitrogen acquisition and plant-and-microbial nitrogen competition. Here, we attempt to map the leaf C:N ratio spatial variation in the past 5 decades in China with a combination of data-driven model and process-based modeling. These two approaches showed consistent results. Over different regions, we found that leaf C:N ratio had significant but uneven changes between 2 time periods (1960-1989 and 1990-2015): a 5% ± 8% increase for temperate grasslands in northern China, a 3% ± 6% increase for boreal grasslands in western China, and by contrast, a 7% ± 6% decrease for temperate forests in southern China, and a 3% ± 5% decrease for boreal forests in northeastern China. Additionally, the structural equation models indicated that the leaf C:N change was sensitive to ΔNDEP, ΔCO2 and ΔMAT rather than ΔMAP and ecosystem types. Process-based modeling suggested that iNDEP was the main source of soil mineral nitrogen change, dominating leaf C:N ratio change in most areas in China, while eCO2 led to leaf C:N ratio increase in low iNDEP area. This study also indicates that the long-term leaf C:N ratio acclimation was dominated by climate constraint, especially temperature, but was constrained by soil N availability over decade scale.
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Affiliation(s)
- Mingyang Sheng
- State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China
| | - Jinyun Tang
- Climate and Ecosystem Sciences Division, Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Dawen Yang
- State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China.
| | - Joshua B Fisher
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Han Wang
- State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China
| | - Jens Kattge
- Max-Planck-Institute for Biogeochemistry, 07745 Jena, Germany
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Villa P, Bolpagni R, Pinardi M, Tóth VR. Leaf reflectance can surrogate foliar economics better than physiological traits across macrophyte species. PLANT METHODS 2021; 17:115. [PMID: 34758853 PMCID: PMC8582205 DOI: 10.1186/s13007-021-00816-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 10/30/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Macrophytes are key players in aquatic ecosystems diversity, but knowledge on variability of their functional traits, among and within species, is still limited. Remote sensing is a high-throughput, feasible option for characterizing plant traits at different scales, provided that reliable spectroscopy models are calibrated with congruous empirical data, but existing applications are biased towards terrestrial plants. We sampled leaves from six floating and emergent macrophyte species common in temperate areas, covering different phenological stages, seasons, and environmental conditions, and measured leaf reflectance (400-2500 nm) and leaf traits (dealing with photophysiology, pigments, and structure). We explored optimal spectral band combinations and established non-parametric reflectance-based models for selected traits, eventually showing how airborne hyperspectral data could capture spatial-temporal macrophyte variability. RESULTS Our key finding is that structural-leaf dry matter content, leaf mass per area-and biochemical-chlorophyll-a content and chlorophylls to carotenoids ratio-traits can be surrogated by leaf reflectance with normalized error under 17% across macrophyte species. On the other hand, the performance of reflectance-based models for photophysiological traits substantively varies, depending on macrophyte species and target parameters. CONCLUSIONS Our main results show the link between leaf reflectance and leaf economics (structure and biochemistry) for aquatic plants, thus envisioning a crucial role for remote sensing in enhancing the level of detail of macrophyte functional diversity analysis to intra-site and intra-species scales. At the same time, we highlighted some difficulties in establishing a general link between reflectance and photosynthetic performance under high environmental heterogeneity, potentially opening further investigation directions.
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Affiliation(s)
- Paolo Villa
- Institute for Electromagnetic Sensing of the Environment, National Research Council of Italy (CNR-IREA), Milan, Italy.
| | - Rossano Bolpagni
- Institute for Electromagnetic Sensing of the Environment, National Research Council of Italy (CNR-IREA), Milan, Italy
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Monica Pinardi
- Institute for Electromagnetic Sensing of the Environment, National Research Council of Italy (CNR-IREA), Milan, Italy
| | - Viktor R Tóth
- Balaton Limnological Research Institute, Tihany, Hungary.
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Wang CJ, Wan JZ. Functional trait perspective on suitable habitat distribution of invasive plant species at a global scale. Perspect Ecol Conserv 2021. [DOI: 10.1016/j.pecon.2021.07.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Liu S, Zhuang Q. Leaf
13
C data constrain the uncertainty of the carbon dynamics of temperate forest ecosystems. Ecosphere 2021. [DOI: 10.1002/ecs2.3741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Shaoqing Liu
- Department of Earth, Atmospheric and Planetary Sciences Purdue University West Lafayette Indiana USA
- Department of Environmental and Earth Sciences University of Minnesota, Twin Cities Minneapolis Minnesota USA
| | - Qianlai Zhuang
- Department of Earth, Atmospheric and Planetary Sciences Purdue University West Lafayette Indiana USA
- Department of Agronomy Purdue University West Lafayette Indiana USA
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30
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Schrader J, Wright IJ, Kreft H, Westoby M. A roadmap to plant functional island biogeography. Biol Rev Camb Philos Soc 2021; 96:2851-2870. [PMID: 34423523 DOI: 10.1111/brv.12782] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 07/09/2021] [Accepted: 07/12/2021] [Indexed: 01/05/2023]
Abstract
Island biogeography is the study of the spatio-temporal distribution of species, communities, assemblages or ecosystems on islands and other isolated habitats. Island diversity is structured by five classes of process: dispersal, establishment, biotic interactions, extinction and evolution. Classical approaches in island biogeography focused on species richness as the deterministic outcome of these processes. This has proved fruitful, but species traits can potentially offer new biological insights into the processes by which island life assembles and why some species perform better at colonising and persisting on islands. Functional traits refer to morphological and phenological characteristics of an organism or species that can be linked to its ecological strategy and that scale up from individual plants to properties of communities and ecosystems. A baseline hypothesis is for traits and ecological strategies of island species to show similar patterns as a matched mainland environment. However, strong dispersal, environmental and biotic-interaction filters as well as stochasticity associated with insularity modify this baseline. Clades that do colonise often embark on distinct ecological and evolutionary pathways, some because of distinctive evolutionary forces on islands, and some because of the opportunities offered by freedom from competitors or herbivores or the absence of mutualists. Functional traits are expected to be shaped by these processes. Here, we review and discuss the potential for integrating functional traits into island biogeography. While we focus on plants, the general considerations and concepts may be extended to other groups of organisms. We evaluate how functional traits on islands relate to core principles of species dispersal, establishment, extinction, reproduction, biotic interactions, evolution and conservation. We formulate existing knowledge as 33 working hypotheses. Some of these are grounded on firm empirical evidence, others provide opportunities for future research. We organise our hypotheses under five overarching sections. Section A focuses on plant functional traits enabling species dispersal to islands. Section B discusses how traits help to predict species establishment, successional trajectories and natural extinctions on islands. Section C reviews how traits indicate species biotic interactions and reproduction strategies and which traits promote intra-island dispersal. Section D discusses how evolution on islands leads to predictable changes in trait values and which traits are most susceptible to change. Section E debates how functional ecology can be used to study multiple drivers of global change on islands and to formulate effective conservation measures. Islands have a justified reputation as research models. They illuminate the forces operating within mainland communities by showing what happens when those forces are released or changed. We believe that the lens of functional ecology can shed more light on these forces than research approaches that do not consider functional differences among species.
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Affiliation(s)
- Julian Schrader
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia.,Department of Biodiversity, Macroecology and Biogeography, University of Goettingen, Büsgenweg 1, 37077, Goettingen, Germany
| | - Ian J Wright
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - Holger Kreft
- Department of Biodiversity, Macroecology and Biogeography, University of Goettingen, Büsgenweg 1, 37077, Goettingen, Germany.,Centre of Biodiversity and Sustainable Land Use (CBL), University of Goettingen, Büsgenweg 1, 37077, Goettingen, Germany
| | - Mark Westoby
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
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Schiller C, Schmidtlein S, Boonman C, Moreno-Martínez A, Kattenborn T. Deep learning and citizen science enable automated plant trait predictions from photographs. Sci Rep 2021; 11:16395. [PMID: 34385494 PMCID: PMC8361087 DOI: 10.1038/s41598-021-95616-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 06/30/2021] [Indexed: 11/09/2022] Open
Abstract
Plant functional traits ('traits') are essential for assessing biodiversity and ecosystem processes, but cumbersome to measure. To facilitate trait measurements, we test if traits can be predicted through visible morphological features by coupling heterogeneous photographs from citizen science (iNaturalist) with trait observations (TRY database) through Convolutional Neural Networks (CNN). Our results show that image features suffice to predict several traits representing the main axes of plant functioning. The accuracy is enhanced when using CNN ensembles and incorporating prior knowledge on trait plasticity and climate. Our results suggest that these models generalise across growth forms, taxa and biomes around the globe. We highlight the applicability of this approach by producing global trait maps that reflect known macroecological patterns. These findings demonstrate the potential of Big Data derived from professional and citizen science in concert with CNN as powerful tools for an efficient and automated assessment of Earth's plant functional diversity.
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Affiliation(s)
- Christopher Schiller
- Institute of Geography and Geoecology, Karlsruhe Institute of Technology (KIT), 76131, Karlsruhe, Germany
| | - Sebastian Schmidtlein
- Institute of Geography and Geoecology, Karlsruhe Institute of Technology (KIT), 76131, Karlsruhe, Germany
| | - Coline Boonman
- Department of Environmental Science, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands
| | | | - Teja Kattenborn
- Remote Sensing Center for Earth System Research, Leipzig University & Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany.
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32
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Global variation in the fraction of leaf nitrogen allocated to photosynthesis. Nat Commun 2021; 12:4866. [PMID: 34381045 PMCID: PMC8358060 DOI: 10.1038/s41467-021-25163-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 07/22/2021] [Indexed: 02/07/2023] Open
Abstract
Plants invest a considerable amount of leaf nitrogen in the photosynthetic enzyme ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO), forming a strong coupling of nitrogen and photosynthetic capacity. Variability in the nitrogen-photosynthesis relationship indicates different nitrogen use strategies of plants (i.e., the fraction nitrogen allocated to RuBisCO; fLNR), however, the reason for this remains unclear as widely different nitrogen use strategies are adopted in photosynthesis models. Here, we use a comprehensive database of in situ observations, a remote sensing product of leaf chlorophyll and ancillary climate and soil data, to examine the global distribution in fLNR using a random forest model. We find global fLNR is 18.2 ± 6.2%, with its variation largely driven by negative dependence on leaf mass per area and positive dependence on leaf phosphorus. Some climate and soil factors (i.e., light, atmospheric dryness, soil pH, and sand) have considerable positive influences on fLNR regionally. This study provides insight into the nitrogen-photosynthesis relationship of plants globally and an improved understanding of the global distribution of photosynthetic potential.
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The Potential of Mapping Grassland Plant Diversity with the Links among Spectral Diversity, Functional Trait Diversity, and Species Diversity. REMOTE SENSING 2021. [DOI: 10.3390/rs13153034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mapping biodiversity is essential for assessing conservation and ecosystem services in global terrestrial ecosystems. Compared with remotely sensed mapping of forest biodiversity, that of grassland plant diversity has been less studied, because of the small size of individual grass species and the inherent difficulty in identifying these species. The technological advances in unmanned aerial vehicle (UAV)-based or proximal imaging spectroscopy with high spatial resolution provide new approaches for mapping and assessing grassland plant diversity based on spectral diversity and functional trait diversity. However, relatively few studies have explored the relationships among spectral diversity, remote-sensing-estimated functional trait diversity, and species diversity in grassland ecosystems. In this study, we examined the links among spectral diversity, functional trait diversity, and species diversity in a semi-arid grassland monoculture experimental site. The results showed that (1) different grassland plant species harbored different functional traits or trait combinations (functional trait diversity), leading to different spectral patterns (spectral diversity). (2) The spectral diversity of grassland plant species increased gradually from the visible (VIR, 400–700 nm) to the near-infrared (NIR, 700–1100 nm) region, and to the short-wave infrared (SWIR, 1100–2400 nm) region. (3) As the species richness increased, the functional traits and spectral diversity increased in a nonlinear manner, finally tending to saturate. (4) Grassland plant species diversity could be accurately predicted using hyperspectral data (R2 = 0.73, p < 0.001) and remotely sensed functional traits (R2 = 0.66, p < 0.001) using cluster algorithms. This will enhance our understanding of the effect of biodiversity on ecosystem functions and support regional grassland biodiversity conservation.
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34
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Twardochleb L, Hiltner E, Pyne M, Zarnetske P. Freshwater insects CONUS: A database of freshwater insect occurrences and traits for the contiguous United States. GLOBAL ECOLOGY AND BIOGEOGRAPHY : A JOURNAL OF MACROECOLOGY 2021; 30:826-841. [PMID: 33776581 PMCID: PMC7986927 DOI: 10.1111/geb.13257] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 11/09/2020] [Accepted: 11/23/2020] [Indexed: 05/13/2023]
Abstract
MOTIVATION Freshwater insects comprise 60% of freshwater animal diversity; they are widely used to assess water quality, and they provide prey for numerous freshwater and terrestrial taxa. Our knowledge of the distribution of freshwater insect diversity in the USA is incomplete because we lack comprehensive, standardized data on their distributions and functional traits at the scale of the contiguous United States (CONUS). We fill this knowledge gap by presenting Freshwater insects CONUS: A database of freshwater insect occurrences and traits for the contiguous United States. This database includes 2.05 million occurrence records for 932 genera in the major freshwater insect orders, at 51,044 stream locations sampled between 2001 and 2018 by federal and state biological monitoring programmes. Compared with existing open-access databases, we tripled the number of occurrence records and locations and added records for 118 genera. We also present life-history, dispersal, morphological and ecological traits and trait affinities (analogous to fuzzy-coded traits) for 1,007 stream insect genera, assembled from existing databases, reference books and the primary literature. We nearly doubled the number of traits for 11 trait groups and added traits for 180 genera that were not available from open-access databases. Our database, Freshwater insects CONUS, facilitates the mapping of freshwater insect taxonomic and functional diversity and, when paired with environmental data, will provide a powerful resource for quantifying how the environment shapes stream insect diversity and taxon-specific distributions. MAIN TYPES OF VARIABLES CONTAINED Georeferenced occurrence records and traits for stream insects. SPATIAL LOCATION AND GRAIN Contiguous United States at a grain of c. 1 m2. TIME PERIOD AND GRAIN Occurrence records from January 2001 to December 2018, with 1-day temporal resolution. Traits from January 1911 to December 2018. MAJOR TAXA AND LEVEL OF MEASUREMENT Genera from the orders Coleoptera, Diptera, Ephemeroptera, Hemiptera, Lepidoptera, Megaloptera, Neuroptera, Odonata, Plecoptera and Trichoptera. SOFTWARE FORMAT .csv.
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Affiliation(s)
- Laura Twardochleb
- Department of Fisheries and WildlifeMichigan State UniversityEast LansingMIUSA
- Ecology, Evolutionary Biology and Behavior ProgramMichigan State UniversityEast LansingMIUSA
| | - Ethan Hiltner
- Department of Fisheries and WildlifeMichigan State UniversityEast LansingMIUSA
| | - Matthew Pyne
- Department of BiologyLamar UniversityBeaumontTXUSA
| | - Phoebe Zarnetske
- Ecology, Evolutionary Biology and Behavior ProgramMichigan State UniversityEast LansingMIUSA
- Department of Integrative BiologyMichigan State UniversityEast LansingMIUSA
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He Y, Wang X, Wang K, Tang S, Xu H, Chen A, Ciais P, Li X, Peñuelas J, Piao S. Data-driven estimates of global litter production imply slower vegetation carbon turnover. GLOBAL CHANGE BIOLOGY 2021; 27:1678-1688. [PMID: 33423389 DOI: 10.1111/gcb.15515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 12/10/2020] [Accepted: 01/05/2021] [Indexed: 06/12/2023]
Abstract
Accurate quantification of vegetation carbon turnover time (τveg ) is critical for reducing uncertainties in terrestrial vegetation response to future climate change. However, in the absence of global information of litter production, τveg could only be estimated based on net primary productivity under the steady-state assumption. Here, we applied a machine-learning approach to derive a global dataset of litter production by linking 2401 field observations and global environmental drivers. Results suggested that the observation-based estimate of global natural ecosystem litter production was 44.3 ± 0.4 Pg C year-1 . By contrast, land-surface models (LSMs) overestimated the global litter production by about 27%. With this new global litter production dataset, we estimated global τveg (mean value 10.3 ± 1.4 years) and its spatial distribution. Compared to our observation-based τveg , modelled τveg tended to underestimate τveg at high latitudes. Our empirically derived gridded datasets of litter production and τveg will help constrain global vegetation models and improve the prediction of global carbon cycle.
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Affiliation(s)
- Yue He
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Xuhui Wang
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Kai Wang
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Shuchang Tang
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Hao Xu
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Anping Chen
- Department of Biology, Colorado State University, Fort Collins, CO, USA
| | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), CEA CNRS UVSQ, Gif Sur Yvette, France
| | - Xiangyi Li
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Josep Peñuelas
- CREAF, Barcelona, Spain
- Global Ecology Unit CREAF-CSIC-UAB, CSIC, Barcelona, Spain
| | - Shilong Piao
- Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China
- Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China
- Center for Excellence in Tibetan Earth Science, Chinese Academy of Sciences, Beijing, China
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36
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Thom D, Taylor AR, Seidl R, Thuiller W, Wang J, Robideau M, Keeton WS. Forest structure, not climate, is the primary driver of functional diversity in northeastern North America. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 762:143070. [PMID: 33127131 PMCID: PMC7612768 DOI: 10.1016/j.scitotenv.2020.143070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 10/10/2020] [Accepted: 10/10/2020] [Indexed: 06/11/2023]
Abstract
Functional diversity (FD), represented by plant traits, is fundamentally linked to an ecosystem's capacity to respond to environmental change. Yet, little is known about the spatial distribution of FD and its drivers. These knowledge gaps prevent the development of FD-based forest management approaches to increase the trait diversity insurance (i.e., the response diversity) against future environmental fluctuations and disturbances. Our study helps fill these knowledge gaps by (i) mapping the current FD distribution, (ii) and analyzing FD drivers across northeastern North America. Following the stress-dominance hypothesis, we expected a strong environmental filtering effect on FD. Moreover, we expected abundant species to determine the bulk of FD distributions as suggested by the mass-ratio hypothesis. We combined a literature and database review of 44 traits for 43 tree species with terrestrial inventory data of 48,426 plots spanning an environmental gradient from northern boreal to temperate biomes. We evaluated the statistical influence of 25 covariates related to forest structure, climate, topography, soils, and stewardship on FD by employing an ensemble approach consisting of 90 non-parametric models. Temperate forests and the boreal-temperate ecotone east and northeast of the Great Lakes were identified as FD hotspots. Environmental filtering by climate was of secondary importance, with forest structure explaining most of the FD distribution of tree species in northeastern North America. Thus, our study provides only partial support for the stress-dominance hypothesis. Species abundance weightings altered trait diversity distributions and drivers only marginally, supporting the mass-ratio hypothesis. Our results suggest that forest management could increase FD without requiring knowledge of functional ecology by fostering stand structural complexity instead. Further, mixing species from different functional groups identified in this study can enhance the trait diversity insurance of forests to an uncertain future.
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Affiliation(s)
- Dominik Thom
- Rubenstein School of Environment and Natural Resources, University of Vermont, 81 Carrigan Drive, Burlington, VT 05405, USA; Gund Institute for Environment, University of Vermont, 617 Main Street, Burlington, VT 05405, USA; Institute of Silviculture, Department of Forest- and Soil Sciences, University of Natural Resources and Life Sciences (BOKU) Vienna, Peter-Jordan-Straße 82, 1190 Vienna, Austria; Ecosystem Dynamics and Forest Management Group, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany.
| | - Anthony R Taylor
- Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada, 1350 Regent Street, P.O. Box 4000, Fredericton, NB E3B 5P7, Canada
| | - Rupert Seidl
- Institute of Silviculture, Department of Forest- and Soil Sciences, University of Natural Resources and Life Sciences (BOKU) Vienna, Peter-Jordan-Straße 82, 1190 Vienna, Austria; Ecosystem Dynamics and Forest Management Group, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany; Berchtesgaden National Park, Doktorberg 6, 83471 Berchtesgaden, Germany
| | - Wilfried Thuiller
- Université Grenoble Alpes, CNRS, Université Savoie-Mont-Blanc, LECA, Laboratoire d'Ecologie Alpine, F-38000 Grenoble, France
| | - Jiejie Wang
- Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada, 1350 Regent Street, P.O. Box 4000, Fredericton, NB E3B 5P7, Canada
| | - Mary Robideau
- Rubenstein School of Environment and Natural Resources, University of Vermont, 81 Carrigan Drive, Burlington, VT 05405, USA
| | - William S Keeton
- Rubenstein School of Environment and Natural Resources, University of Vermont, 81 Carrigan Drive, Burlington, VT 05405, USA; Gund Institute for Environment, University of Vermont, 617 Main Street, Burlington, VT 05405, USA
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Harris T, Mulligan M, Brummitt N. Opportunities and challenges for herbaria in studying the spatial variation in plant functional diversity. SYST BIODIVERS 2021. [DOI: 10.1080/14772000.2021.1887394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Timothy Harris
- Department of Life Sciences, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
- Department of Geography, King’s College London, 30 Aldwych, London, WC2B 4BG, UK
| | - Mark Mulligan
- Department of Geography, King’s College London, 30 Aldwych, London, WC2B 4BG, UK
| | - Neil Brummitt
- Department of Life Sciences, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
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Cavender-Bares J, Reich P, Townsend P, Banerjee A, Butler E, Desai A, Gevens A, Hobbie S, Isbell F, Laliberté E, Meireles JE, Menninger H, Pavlick R, Pinto-Ledezma J, Potter C, Schuman M, Springer N, Stefanski A, Trivedi P, Trowbridge A, Williams L, Willis C, Yang Y. BII-Implementation: The causes and consequences of plant biodiversity across scales in a rapidly changing world. RESEARCH IDEAS AND OUTCOMES 2021. [DOI: 10.3897/rio.7.e63850] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The proposed Biology Integration Institute will bring together two major research institutions in the Upper Midwest—the University of Minnesota (UMN) and University of Wisconsin-Madison (UW)—to investigate the causes and consequences of plant biodiversity across scales in a rapidly changing world—from genes and molecules within cells and tissues to communities, ecosystems, landscapes and the biosphere. The Institute focuses on plant biodiversity, defined broadly to encompass the heterogeneity within life that occurs from the smallest to the largest biological scales. A premise of the Institute is that life is envisioned as occurring at different scales nested within several contrasting conceptions of biological hierarchies, defined by the separate but related fields of physiology, evolutionary biology and ecology. The Institute will emphasize the use of ‘spectral biology’—detection of biological properties based on the interaction of light energy with matter—and process-oriented predictive models to investigate the processes by which biological components at one scale give rise to emergent properties at higher scales. Through an iterative process that harnesses cutting edge technologies to observe a suite of carefully designed empirical systems—including the National Ecological Observatory Network (NEON) and some of the world’s longest running and state-of-the-art global change experiments—the Institute will advance biological understanding and theory of the causes and consequences of changes in biodiversity and at the interface of plant physiology, ecology and evolution.
INTELLECTUAL MERIT
The Institute brings together a diverse, gender-balanced and highly productive team with significant leadership experience that spans biological disciplines and career stages and is poised to integrate biology in new ways. Together, the team will harness the potential of spectral biology, experiments, observations and synthetic modeling in a manner never before possible to transform understanding of how variation within and among biological scales drives plant and ecosystem responses to global change over diurnal, seasonal and millennial time scales. In doing so, it will use and advance state-of-the-art theory. The institute team posits that the designed projects will unearth transformative understanding and biological rules at each of the various scales that will enable an unprecedented capacity to discern the linkages between physiological, ecological and evolutionary processes in relation to the multi-dimensional nature of biodiversity in this time of massive planetary change. A strength of the proposed Institute is that it leverages prior federal investments in research and formalizes partnerships with foreign institutions heavily invested in related biodiversity research. Most of the planned projects leverage existing research initiatives, infrastructure, working groups, experiments, training programs, and public outreach infrastructure, all of which are already highly synergistic and collaborative, and will bring together members of the overall research and training team.
BROADER IMPACTS
A central goal of the proposed Institute is to train the next generation of diverse integrative biologists. Post-doctoral, graduate student and undergraduate trainees, recruited from non-traditional and underrepresented groups, including through formal engagement with Native American communities, will receive a range of mentoring and training opportunities. Annual summer training workshops will be offered at UMN and UW as well as training experiences with the Global Change and Biodiversity Research Priority Program (URPP-GCB) at the University of Zurich (UZH) and through the Canadian Airborne Biodiversity Observatory (CABO). The Institute will engage diverse K-12 audiences, the general public and Native American communities through Market Science modules, Minute Earth videos, a museum exhibit and public engagement and educational activities through the Bell Museum of Natural History, the Cedar Creek Ecosystem Science Reserve (CCESR) and the Wisconsin Tribal Conservation Association.
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Wilcox KR, Blumenthal DM, Kray JA, Mueller KE, Derner JD, Ocheltree T, Porensky LM. Plant traits related to precipitation sensitivity of species and communities in semiarid shortgrass prairie. THE NEW PHYTOLOGIST 2021; 229:2007-2019. [PMID: 33053217 DOI: 10.1111/nph.17000] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 10/05/2020] [Indexed: 05/18/2023]
Abstract
Understanding how plant communities respond to temporal patterns of precipitation in water-limited ecosystems is necessary to predict interannual variation and trends in ecosystem properties, including forage production, biogeochemical cycling, and biodiversity. In North American shortgrass prairie, we measured plant abundance, functional traits related to growth rate and drought tolerance, and aboveground net primary productivity to identify: species-level responsiveness to precipitation (precipitation sensitivity Sspp ) across functional groups; Sspp relationships to continuous plant traits; and whether continuous trait-Sspp relationships scaled to the community level. Across 32 plant species, we found strong bivariate relationships of both leaf dry matter content (LDMC) and leaf osmotic potential Ψosm with Sspp . Yet, LDMC and specific leaf area were retained in the lowest Akaike information criterion multiple regression model, explaining 59% of Sspp . Most relationships between continuous traits and Sspp scaled to the community level but were often contingent on the presence/absence of particular species and/or land management at a site. Thus, plant communities in shortgrass prairie may shift towards slower growing, more stress-resistant species in drought years and/or chronically drier climate. These findings highlight the importance of both leaf economic and drought tolerance traits in determining species and community responses to altered precipitation.
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Affiliation(s)
- Kevin R Wilcox
- Department of Ecosystem Science and Management, University of Wyoming, 1000 E University Avenue, Laramie, WY, 82071, USA
- Crops Research Laboratory, USDA ARS - Rangeland Resources and Systems Research Unit, 1701 Centre Avenue, Fort Collins, CO, 80526, USA
| | - Dana M Blumenthal
- Crops Research Laboratory, USDA ARS - Rangeland Resources and Systems Research Unit, 1701 Centre Avenue, Fort Collins, CO, 80526, USA
| | - Julie A Kray
- Crops Research Laboratory, USDA ARS - Rangeland Resources and Systems Research Unit, 1701 Centre Avenue, Fort Collins, CO, 80526, USA
| | - Kevin E Mueller
- Biological, Geological and Environmental Sciences, Cleveland State University, 2121 Euclid Avenue, SI 219, Cleveland, OH, 44115-2214, USA
| | - Justin D Derner
- USDA-ARS Rangeland Resources and Systems Research Unit, 8408 Hildreth Road, Cheyenne, WY,, 82009, USA
| | - Troy Ocheltree
- Department of Forest and Rangeland Stewardship, Colorado State University, Fort Collins, CO, 80523, USA
| | - Lauren M Porensky
- Crops Research Laboratory, USDA ARS - Rangeland Resources and Systems Research Unit, 1701 Centre Avenue, Fort Collins, CO, 80526, USA
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Chen W, Tape KD, Euskirchen ES, Liang S, Matos A, Greenberg J, Fraterrigo JM. Impacts of Arctic Shrubs on Root Traits and Belowground Nutrient Cycles Across a Northern Alaskan Climate Gradient. FRONTIERS IN PLANT SCIENCE 2020; 11:588098. [PMID: 33362815 PMCID: PMC7758488 DOI: 10.3389/fpls.2020.588098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
Deciduous shrubs are expanding across the graminoid-dominated nutrient-poor arctic tundra. Absorptive root traits of shrubs are key determinants of nutrient acquisition strategy from tundra soils, but the variations of shrub root traits within and among common shrub genera across the arctic climatic gradient are not well resolved. Consequently, the impacts of arctic shrub expansion on belowground nutrient cycling remain largely unclear. Here, we collected roots from 170 plots of three commonly distributed shrub genera (Alnus, Betula, and Salix) and a widespread sedge (Eriophorum vaginatum) along a climatic gradient in northern Alaska. Absorptive root traits that are relevant to the strategy of plant nutrient acquisition were determined. The influence of aboveground dominant vegetation cover on the standing root biomass, root productivity, vertical rooting profile, as well as the soil nitrogen (N) pool in the active soil layer was examined. We found consistent root trait variation among arctic plant genera along the sampling transect. Alnus and Betula had relatively thicker and less branched, but more frequently ectomycorrhizal colonized absorptive roots than Salix, suggesting complementarity between root efficiency and ectomycorrhizal dependence among the co-existing shrubs. Shrub-dominated plots tended to have more productive absorptive roots than sedge-dominated plots. At the northern sites, deep absorptive roots (>20 cm depth) were more frequent in birch-dominated plots. We also found shrub roots extensively proliferated into the adjacent sedge-dominated plots. The soil N pool in the active layer generally decreased from south to north but did not vary among plots dominated by different shrub or sedge genera. Our results reveal diverse nutrient acquisition strategies and belowground impacts among different arctic shrubs, suggesting that further identifying the specific shrub genera in the tundra landscape will ultimately provide better predictions of belowground dynamics across the changing arctic.
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Affiliation(s)
- Weile Chen
- Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Ken D. Tape
- Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States
| | - Eugénie S. Euskirchen
- Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, United States
| | - Shuang Liang
- Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Adriano Matos
- Department of Natural Resources and Environmental Science, University of Nevada, Reno, Reno, NV, United States
| | - Jonathan Greenberg
- Department of Natural Resources and Environmental Science, University of Nevada, Reno, Reno, NV, United States
| | - Jennifer M. Fraterrigo
- Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States
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Wang Z, Chlus A, Geygan R, Ye Z, Zheng T, Singh A, Couture JJ, Cavender-Bares J, Kruger EL, Townsend PA. Foliar functional traits from imaging spectroscopy across biomes in eastern North America. THE NEW PHYTOLOGIST 2020; 228:494-511. [PMID: 32463927 DOI: 10.1111/nph.16711] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 05/15/2020] [Indexed: 05/28/2023]
Abstract
Foliar functional traits are widely used to characterize leaf and canopy properties that drive ecosystem processes and to infer physiological processes in Earth system models. Imaging spectroscopy provides great potential to map foliar traits to characterize continuous functional variation and diversity, but few studies have demonstrated consistent methods for mapping multiple traits across biomes. With airborne imaging spectroscopy data and field data from 19 sites, we developed trait models using partial least squares regression, and mapped 26 foliar traits in seven NEON (National Ecological Observatory Network) ecoregions (domains) including temperate and subtropical forests and grasslands of eastern North America. Model validation accuracy varied among traits (normalized root mean squared error, 9.1-19.4%; coefficient of determination, 0.28-0.82), with phenolic concentration, leaf mass per area and equivalent water thickness performing best across domains. Across all trait maps, 90% of vegetated pixels had reasonable values for one trait, and 28-81% provided high confidence for multiple traits concurrently. Maps of 26 traits and their uncertainties for eastern US NEON sites are available for download, and are being expanded to the western United States and tundra/boreal zone. These data enable better understanding of trait variations and relationships over large areas, calibration of ecosystem models, and assessment of continental-scale functional diversity.
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Affiliation(s)
- Zhihui Wang
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, 53706, USA
| | - Adam Chlus
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, 53706, USA
| | - Ryan Geygan
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, 53706, USA
| | - Zhiwei Ye
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, 53706, USA
| | - Ting Zheng
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, 53706, USA
| | - Aditya Singh
- Department of Agricultural and Biological Engineering, University of Florida, 1741 Museum Rd, Gainesville, FL, 32611, USA
| | - John J Couture
- Departments of Entomology and Forestry and Natural Resources and Center for Plant Biology, Purdue University, 901 W. State St, West Lafayette, IN, 47907, USA
| | - Jeannine Cavender-Bares
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Eric L Kruger
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, 53706, USA
| | - Philip A Townsend
- Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI, 53706, USA
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Meeus S, Van den Bulcke J, wyffels F. From leaf to label: A robust automated workflow for stomata detection. Ecol Evol 2020; 10:9178-9191. [PMID: 32953053 PMCID: PMC7487252 DOI: 10.1002/ece3.6571] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 06/11/2020] [Accepted: 06/15/2020] [Indexed: 12/24/2022] Open
Abstract
Plant leaf stomata are the gatekeepers of the atmosphere-plant interface and are essential building blocks of land surface models as they control transpiration and photosynthesis. Although more stomatal trait data are needed to significantly reduce the error in these model predictions, recording these traits is time-consuming, and no standardized protocol is currently available. Some attempts were made to automate stomatal detection from photomicrographs; however, these approaches have the disadvantage of using classic image processing or targeting a narrow taxonomic entity which makes these technologies less robust and generalizable to other plant species. We propose an easy-to-use and adaptable workflow from leaf to label. A methodology for automatic stomata detection was developed using deep neural networks according to the state of the art and its applicability demonstrated across the phylogeny of the angiosperms.We used a patch-based approach for training/tuning three different deep learning architectures. For training, we used 431 micrographs taken from leaf prints made according to the nail polish method from herbarium specimens of 19 species. The best-performing architecture was tested on 595 images of 16 additional species spread across the angiosperm phylogeny.The nail polish method was successfully applied in 78% of the species sampled here. The VGG19 architecture slightly outperformed the basic shallow and deep architectures, with a confidence threshold equal to 0.7 resulting in an optimal trade-off between precision and recall. Applying this threshold, the VGG19 architecture obtained an average F-score of 0.87, 0.89, and 0.67 on the training, validation, and unseen test set, respectively. The average accuracy was very high (94%) for computed stomatal counts on unseen images of species used for training.The leaf-to-label pipeline is an easy-to-use workflow for researchers of different areas of expertise interested in detecting stomata more efficiently. The described methodology was based on multiple species and well-established methods so that it can serve as a reference for future work.
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Affiliation(s)
| | | | - Francis wyffels
- Department of Electronics and Information SystemsIDLab‐AIROGhent University‐‐imecZwijnaardeBelgium
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Gong H, Li Y, Yu T, Zhang S, Gao J, Zhang S, Sun D. Soil and climate effects on leaf nitrogen and phosphorus stoichiometry along elevational gradients. Glob Ecol Conserv 2020. [DOI: 10.1016/j.gecco.2020.e01138] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Taubert F, Hetzer J, Schmid JS, Huth A. Confronting an individual-based simulation model with empirical community patterns of grasslands. PLoS One 2020; 15:e0236546. [PMID: 32722690 PMCID: PMC7386574 DOI: 10.1371/journal.pone.0236546] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 07/09/2020] [Indexed: 11/18/2022] Open
Abstract
Grasslands contribute to global biogeochemical cycles and can host a high number of plant species. Both-species dynamics and biogeochemical fluxes-are influenced by abiotic and biotic environmental factors, management and natural disturbances. In order to understand and project grassland dynamics under global change, vegetation models which explicitly capture all relevant processes and drivers are required. However, the parameterization of such models is often challenging. Here, we report on testing an individual- and process-based model for simulating the dynamics and structure of a grassland experiment in temperate Europe. We parameterized the model for three species and confront simulated grassland dynamics with empirical observations of their monocultures and one two-species mixture. The model reproduces general trends of vegetation patterns (vegetation cover and height, aboveground biomass and leaf area index) for the monocultures and two-species community. For example, the model simulates well an average annual grassland cover of 70% in the species mixture (observed cover of 77%), but also shows mismatches with specific observation values (e.g. for aboveground biomass). By a sensitivity analysis of the applied inverse model parameterization method, we demonstrate that multiple vegetation attributes are important for a successful parameterization while leaf area index revealed to be of highest relevance. Results of our study pinpoint to the need of improved grassland measurements (esp. of temporally higher resolution) in close combination with advanced modelling approaches.
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Affiliation(s)
- Franziska Taubert
- Department of Ecological Modelling, Helmholtz Centre for Environmental Research–UFZ, Leipzig, Saxony, Germany
- * E-mail:
| | - Jessica Hetzer
- Department of Ecological Modelling, Helmholtz Centre for Environmental Research–UFZ, Leipzig, Saxony, Germany
| | - Julia Sabine Schmid
- Department of Ecological Modelling, Helmholtz Centre for Environmental Research–UFZ, Leipzig, Saxony, Germany
| | - Andreas Huth
- Department of Ecological Modelling, Helmholtz Centre for Environmental Research–UFZ, Leipzig, Saxony, Germany
- Institute of Environmental Systems Research, University of Osnabrück, Osnabrück, Lower Saxony, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Saxony, Germany
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Li X, Piao S, Wang K, Wang X, Wang T, Ciais P, Chen A, Lian X, Peng S, Peñuelas J. Temporal trade-off between gymnosperm resistance and resilience increases forest sensitivity to extreme drought. Nat Ecol Evol 2020; 4:1075-1083. [DOI: 10.1038/s41559-020-1217-3] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 05/05/2020] [Indexed: 01/15/2023]
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Robust leaf trait relationships across species under global environmental changes. Nat Commun 2020; 11:2999. [PMID: 32532992 PMCID: PMC7293315 DOI: 10.1038/s41467-020-16839-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 05/26/2020] [Indexed: 12/18/2022] Open
Abstract
Recent studies show coordinated relationships between plant leaf traits and their capacity to predict ecosystem functions. However, how leaf traits will change within species and whether interspecific trait relationships will shift under future environmental changes both remain unclear. Here, we examine the bivariate correlations between leaf economic traits of 515 species in 210 experiments which mimic climate warming, drought, elevated CO2, and nitrogen deposition. We find divergent directions of changes in trait-pairs between species, and the directions mostly do not follow the interspecific trait relationships. However, the slopes in the logarithmic transformed interspecific trait relationships hold stable under environmental changes, while only their elevations vary. The elevation changes of trait relationship are mainly driven by asymmetrically interspecific responses contrary to the direction of the leaf economic spectrum. These findings suggest robust interspecific trait relationships under global changes, and call for linking within-species responses to interspecific coordination of plant traits. It is unclear whether rapid global change will lead to unexpected trait combinations. In this global meta-analysis on vascular plants, Cui et al. show that, although within-species responses do not always follow the leaf economic spectrum, the slopes of interspecific trait relationships are robust to rapid environmental change.
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Boonman CCF, Benítez‐López A, Schipper AM, Thuiller W, Anand M, Cerabolini BEL, Cornelissen JHC, Gonzalez‐Melo A, Hattingh WN, Higuchi P, Laughlin DC, Onipchenko VG, Peñuelas J, Poorter L, Soudzilovskaia NA, Huijbregts MAJ, Santini L. Assessing the reliability of predicted plant trait distributions at the global scale. GLOBAL ECOLOGY AND BIOGEOGRAPHY : A JOURNAL OF MACROECOLOGY 2020; 29:1034-1051. [PMID: 32612452 PMCID: PMC7319484 DOI: 10.1111/geb.13086] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 02/17/2020] [Accepted: 02/18/2020] [Indexed: 06/01/2023]
Abstract
AIM Predictions of plant traits over space and time are increasingly used to improve our understanding of plant community responses to global environmental change. A necessary step forward is to assess the reliability of global trait predictions. In this study, we predict community mean plant traits at the global scale and present a systematic evaluation of their reliability in terms of the accuracy of the models, ecological realism and various sources of uncertainty. LOCATION Global. TIME PERIOD Present. MAJOR TAXA STUDIED Vascular plants. METHODS We predicted global distributions of community mean specific leaf area, leaf nitrogen concentration, plant height and wood density with an ensemble modelling approach based on georeferenced, locally measured trait data representative of the plant community. We assessed the predictive performance of the models, the plausibility of predicted trait combinations, the influence of data quality, and the uncertainty across geographical space attributed to spatial extrapolation and diverging model predictions. RESULTS Ensemble predictions of community mean plant height, specific leaf area and wood density resulted in ecologically plausible trait-environment relationships and trait-trait combinations. Leaf nitrogen concentration, however, could not be predicted reliably. The ensemble approach was better at predicting community trait means than any of the individual modelling techniques, which varied greatly in predictive performance and led to divergent predictions, mostly in African deserts and the Arctic, where predictions were also extrapolated. High data quality (i.e., including intraspecific variability and a representative species sample) increased model performance by 28%. MAIN CONCLUSIONS Plant community traits can be predicted reliably at the global scale when using an ensemble approach and high-quality data for traits that mostly respond to large-scale environmental factors. We recommend applying ensemble forecasting to account for model uncertainty, using representative trait data, and more routinely assessing the reliability of trait predictions.
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Affiliation(s)
- Coline C. F. Boonman
- Department of Environmental ScienceInstitute for Water and Wetland ResearchRadboud UniversityNijmegenthe Netherlands
| | - Ana Benítez‐López
- Department of Environmental ScienceInstitute for Water and Wetland ResearchRadboud UniversityNijmegenthe Netherlands
- Integrative Ecology GroupEstación Biológica de Doñana (EBD‐CSIC)SevillaSpain
| | - Aafke M. Schipper
- Department of Environmental ScienceInstitute for Water and Wetland ResearchRadboud UniversityNijmegenthe Netherlands
- PBL Netherlands Environmental Assessment AgencyThe Haguethe Netherlands
| | - Wilfried Thuiller
- Université Grenoble Alpes, CNRS, University of Savoie Mont BlancLECA, Laboratoire d’Écologie AlpineGrenobleFrance
| | - Madhur Anand
- School of Environmental SciencesUniversity of GuelphGuelphOntarioCanada
| | | | | | - Andres Gonzalez‐Melo
- Facultad de Ciencias Naturales y MatemáticasUniversidad del RosarioBogotaColombia
| | - Wesley N. Hattingh
- School of Animal, Plant and Environmental SciencesUniversity of the WitwatersrandJohannesburgSouth Africa
| | - Pedro Higuchi
- Forestry DepartmentSanta Catarina State UniversityLagesBrazil
| | | | | | - Josep Peñuelas
- CREAF, VallèsCataloniaSpain
- CSIC, Global Ecology Unit CREAF‐CEAB‐UABCataloniaSpain
| | - Lourens Poorter
- Forest Ecology and Forest Management GroupWageningen University and ResearchWageningenthe Netherlands
| | - Nadejda A. Soudzilovskaia
- Environmental Biology DepartmentInstitute of Environmental SciencesLeiden UniversityLeidenthe Netherlands
| | - Mark A. J. Huijbregts
- Department of Environmental ScienceInstitute for Water and Wetland ResearchRadboud UniversityNijmegenthe Netherlands
| | - Luca Santini
- Department of Environmental ScienceInstitute for Water and Wetland ResearchRadboud UniversityNijmegenthe Netherlands
- National Research CouncilInstitute of Research on Terrestrial Ecosystems (CNR‐IRET)MonterotondoItaly
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48
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Niu K, Zhang S, Lechowicz MJ. Harsh environmental regimes increase the functional significance of intraspecific variation in plant communities. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13582] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Kechang Niu
- Department of Ecology School of Life Sciences Nanjing University Nanjing China
- Department of Ecology & Evolutionary Biology Cornell University Ithaca NY USA
| | - Shiting Zhang
- State Key Laboratory of Grassland and Agro‐Ecosystems School of Life Science Lanzhou University Lanzhou China
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Monitoring Plant Functional Diversity Using the Reflectance and Echo from Space. REMOTE SENSING 2020. [DOI: 10.3390/rs12081248] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Plant functional diversity (FD) is an important component of biodiversity. Evidence shows that FD strongly determines ecosystem functioning and stability and also regulates various ecosystem services that underpin human well-being. Given the importance of FD, it is critical to monitor its variations in an explicit manner across space and time, a highly demanding task that cannot be resolved solely by field data. Today, high hopes are placed on satellite-based observations to complement field plot data. The promise is that multiscale monitoring of plant FD, ecosystem functioning, and their services is now possible at global scales in near real-time. However, non-trivial scale challenges remain to be overcome before plant ecology can capitalize on the latest advances in Earth Observation (EO). Here, we articulate the existing scale challenges in linking field and satellite data and further elaborated in detail how to address these challenges via the latest innovations in optical and radar sensor technologies and image analysis algorithms. Addressing these challenges not only requires novel remote sensing theories and algorithms but also urges more effective communication between remote sensing scientists and field ecologists to foster mutual understanding of the existing challenges. Only through a collaborative approach can we achieve the global plant functional diversity monitoring goal.
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50
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Shiklomanov AN, Cowdery EM, Bahn M, Byun C, Jansen S, Kramer K, Minden V, Niinemets Ü, Onoda Y, Soudzilovskaia NA, Dietze MC. Does the leaf economic spectrum hold within plant functional types? A Bayesian multivariate trait meta-analysis. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2020; 30:e02064. [PMID: 31872519 DOI: 10.1002/eap.2064] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 11/01/2019] [Accepted: 11/13/2019] [Indexed: 05/25/2023]
Abstract
The leaf economic spectrum is a widely studied axis of plant trait variability that defines a trade-off between leaf longevity and productivity. While this has been investigated at the global scale, where it is robust, and at local scales, where deviations from it are common, it has received less attention at the intermediate scale of plant functional types (PFTs). We investigated whether global leaf economic relationships are also present within the scale of plant functional types (PFTs) commonly used by Earth System models, and the extent to which this global-PFT hierarchy can be used to constrain trait estimates. We developed a hierarchical multivariate Bayesian model that assumes separate means and covariance structures within and across PFTs and fit this model to seven leaf traits from the TRY database related to leaf longevity, morphology, biochemistry, and photosynthetic metabolism. Although patterns of trait covariation were generally consistent with the leaf economic spectrum, we found three approximate tiers to this consistency. Relationships among morphological and biochemical traits (specific leaf area [SLA], N, P) were the most robust within and across PFTs, suggesting that covariation in these traits is driven by universal leaf construction trade-offs and stoichiometry. Relationships among metabolic traits (dark respiration [Rd ], maximum RuBisCo carboxylation rate [Vc,max ], maximum electron transport rate [Jmax ]) were slightly less consistent, reflecting in part their much sparser sampling (especially for high-latitude PFTs), but also pointing to more flexible plasticity in plant metabolistm. Finally, relationships involving leaf lifespan were the least consistent, indicating that leaf economic relationships related to leaf lifespan are dominated by across-PFT differences and that within-PFT variation in leaf lifespan is more complex and idiosyncratic. Across all traits, this covariance was an important source of information, as evidenced by the improved imputation accuracy and reduced predictive uncertainty in multivariate models compared to univariate models. Ultimately, our study reaffirms the value of studying not just individual traits but the multivariate trait space and the utility of hierarchical modeling for studying the scale dependence of trait relationships.
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Affiliation(s)
- Alexey N Shiklomanov
- Joint Global Change Research Institute, Pacific Northwest National Laboratory, College Park, Maryland, 20740, USA
| | - Elizabeth M Cowdery
- Department of Earth & Environment, Boston University, 685 Commonwealth Avenue Boston, Massachusetts, 02215, USA
| | - Michael Bahn
- Institute of Ecology, University of Innsbruck, Innsbruck, 6020, Austria
| | - Chaeho Byun
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Albert-Einstein-Allee 11, Ulm, 89081, Germany
| | - Koen Kramer
- Department of Vegetation, Forest, and Landscape Ecology, Wageningen Environmental Research and Wageningen University, P.O. Box 6708, Droevendaalsesteeg 4, Wageningen, The Netherlands
| | - Vanessa Minden
- Institute for Biology and Environmental Sciences, Carl von Ossietzky-University of Oldenburg, Carl von Ossietzky Strasse 9-11, Oldenburg, 26129, Germany
- Department of Biology, Ecology and Evolution, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, 1050, Belgium
| | - Ülo Niinemets
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu, 51014, Estonia
| | - Yusuke Onoda
- Graduate School of Agriculture, Kyoto University, Kyoto, 605-8503, Japan
| | - Nadejda A Soudzilovskaia
- Conservation Biology Department, Institute of Environmental Sciences, Leiden University, Rapenburg 70, 2311, EZ Leiden, The Netherlands
| | - Michael C Dietze
- Department of Earth & Environment, Boston University, 685 Commonwealth Avenue Boston, Massachusetts, 02215, USA
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