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Shang B, Agathokleous E, Calatayud V, Peng J, Xu Y, Li S, Liu S, Feng Z. Drought mitigates the adverse effects of O 3 on plant photosynthesis rather than growth: A global meta-analysis considering plant functional types. PLANT, CELL & ENVIRONMENT 2024; 47:1269-1284. [PMID: 38185874 DOI: 10.1111/pce.14808] [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: 05/16/2023] [Accepted: 12/21/2023] [Indexed: 01/09/2024]
Abstract
Tropospheric ozone (O3 ) is a phytotoxic air pollutant adversely affecting plant growth. High O3 exposures are often concurrent with summer drought. The effects of both stresses on plants are complex, and their interactions are not yet well understood. Here, we investigate whether drought can mitigate the negative effects of O3 on plant physiology and growth based on a meta-analysis. We found that drought mitigated the negative effects of O3 on plant photosynthesis, but the modification of the O3 effect on the whole-plant biomass by drought was not significant. This is explained by a compensatory response of water-deficient plants that leads to increased metabolic costs. Relative to water control condition, reduced water treatment decreased the effects of O3 on photosynthetic traits, and leaf and root biomass in deciduous broadleaf species, while all traits in evergreen coniferous species showed no significant response. This suggested that the mitigating effects of drought on the negative impacts of O3 on the deciduous broadleaf species were more extensive than on the evergreen coniferous ones. Therefore, to avoid over- or underestimations when assessing the impact of O3 on vegetation growth, soil moisture should be considered. These results contribute to a better understanding of terrestrial ecosystem responses under global change.
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Affiliation(s)
- Bo Shang
- Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
- Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration (ECSS-CMA), School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
| | - Evgenios Agathokleous
- Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
- Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration (ECSS-CMA), School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
| | - Vicent Calatayud
- Fundación CEAM, c/Charles R. Darwin 14, Parque Tecnológico, Paterna, Valencia, Spain
| | - Jinlong Peng
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Yansen Xu
- Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
- Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration (ECSS-CMA), School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
| | - Shuangjiang Li
- Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
- Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration (ECSS-CMA), School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
| | - Shuo Liu
- Zhejiang Carbon Neutral Innovation Institute, Zhejiang University of Technology, Hangzhou, Zhejiang, China
| | - Zhaozhong Feng
- Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
- Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration (ECSS-CMA), School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
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2
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Ren P, Li P, Tang J, Li T, Liu Z, Zhou X, Peng C. Satellite monitoring reveals short-term cumulative and time-lag effect of drought and heat on autumn photosynthetic phenology in subtropical vegetation. ENVIRONMENTAL RESEARCH 2023; 239:117364. [PMID: 37827373 DOI: 10.1016/j.envres.2023.117364] [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: 04/18/2023] [Revised: 09/26/2023] [Accepted: 10/09/2023] [Indexed: 10/14/2023]
Abstract
Comparing with the effect of the average climate change on vegetation phenology, the impacts of extreme climate events remain unclear, especially considering their characteristic cumulative and time-lag effects. Using solar-induced chlorophyll fluorescence (SIF) satellite records, we investigated the cumulative and time-lag effects of drought and heat events on photosynthesis, particularly for the end date of autumn photosynthesis (EOP), in subtropical vegetation in China. Our results showed a negative effect of drought on the delay of EOP, with the cumulative effect on 30.12% (maximum continuous dry days, CDD), 34.82% (dry days, DRD), and 26.14% (dry period, DSDI) of the study area and the general time-lag effect on 50.73% (maximum continuous dry days), 56.61% (dry days), and 47.55% (dry period) of the study area. The cumulative and lagged time were 1-3 months and 2-3 months, respectively. In contrast, the cumulative effect of heat on EOP was observed in 16.27% (warm nights, TN90P), 23.66% (moderate heat days, TX50P), and 19.19% (heavy heat days, TX90P) of the study area, with cumulative time of 1-3 months. The lagged time was 3-4 months, detected in 31.02% (warm nights), 45.86% (moderate heat days), and 36.52% (heavy heat days) of the study area. At the vegetation community level, drought and heat had relatively rapid impacts on EOP in the deciduous broadleaved forest, whereas evergreen forests and bushes responded to heat slowly and took a longer time. Our results revealed that drought and heat have short-term cumulative and time-lag effects on the EOP of subtropical vegetation in China, with varying effects among different vegetation types. These findings provide new insights into the effect of drought and heat on subtropical vegetation and confirm the need to consider these effects in the development of prediction models of autumn phenology for subtropical vegetation.
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Affiliation(s)
- Peixin Ren
- School of Geographical Sciences, Hunan Normal University, Changsha, 410081, China
| | - Peng Li
- School of Geographical Sciences, Hunan Normal University, Changsha, 410081, China.
| | - Jiayi Tang
- School of Geographical Sciences, Hunan Normal University, Changsha, 410081, China
| | - Tong Li
- School of Geographical Sciences, Hunan Normal University, Changsha, 410081, China
| | - Zelin Liu
- School of Geographical Sciences, Hunan Normal University, Changsha, 410081, China
| | - Xiaolu Zhou
- School of Geographical Sciences, Hunan Normal University, Changsha, 410081, China
| | - Changhui Peng
- School of Geographical Sciences, Hunan Normal University, Changsha, 410081, China; Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, C.P. 8888, Succ. Centre-Ville, Montreal, H3C 3P8, Canada.
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3
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Kim EH, Hitchmough JD, Cameron RW, Schrodt F, Martin KWE, Cubey R. Applying the concept of niche breadth to understand urban tree mortality in the UK. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 902:166304. [PMID: 37619719 DOI: 10.1016/j.scitotenv.2023.166304] [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: 06/03/2023] [Revised: 08/11/2023] [Accepted: 08/12/2023] [Indexed: 08/26/2023]
Abstract
Accelerated climate change has raised concerns about heightened vulnerability of urban trees, spurring the need to reevaluate their suitability. The urgency has also driven the widespread application of climatic niche-based models. In particular, the concept of niche breadth (NB), the range of environmental conditions that species can tolerate, is commonly estimated based on species occurrence data over the selected geographic range to predict species response to changing conditions. However, in urban environments where many species are cultivated out of the NB of their natural distributions, additional empirical evidence beyond presence and absence is needed not only to test the true tolerance limits but also to evaluate species' adaptive capacity to future climate. In this research, mortality trends of Acer and Quercus species spanning a 21-year period (2000-2021) from tree inventories of three major UK botanic gardens - the Royal Botanic Gardens, Kew (KEW), Westonbirt, the National Arboretum (WESB), and the Royal Botanic Garden Edinburgh (RBGE) - were analyzed in relation to their NB under long-term drought stress. As a result, Acer species were more responsive to drought and heat stress. For Acer, positioning below the lower limits of the precipitation of warmest quarter led to an increase in the probability of annual mortality by 1.2 and 1.3 % at KEW and RBGE respectively. In addition, the mean cumulative mortality rate increased corresponding to an increase in the number of niche positions below the lower limits of the selected bioclimatic variables. On the other hand, Quercus species in general exhibited comparable resilience regardless of their niche positions. Moreover, Mediterranean oaks were most tolerant, with cumulative mortality rates that were lower than those of native oaks in the UK. These findings further highlight the importance of incorporating ecological performance and recognizing species-specific adaptive strategies in climatic niche modeling.
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Affiliation(s)
- Eun Hye Kim
- Department of Landscape Architecture, University of Sheffield, Arts Tower, Sheffield S10 2TN, UK.
| | - James D Hitchmough
- Department of Landscape Architecture, University of Sheffield, Arts Tower, Sheffield S10 2TN, UK
| | - Ross W Cameron
- Department of Landscape Architecture, University of Sheffield, Arts Tower, Sheffield S10 2TN, UK
| | - Franziska Schrodt
- Department of Geography, University of Nottingham, University Park, Nottingham NG7 2RD, UK
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4
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Spafford L, MacDougall A, Steenberg J. Climate-driven shifts in leaf senescence are greater for boreal species than temperate species in the Acadian Forest region in contrast to leaf emergence shifts. Ecol Evol 2023; 13:e10362. [PMID: 37533970 PMCID: PMC10390504 DOI: 10.1002/ece3.10362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 06/20/2023] [Accepted: 07/17/2023] [Indexed: 08/04/2023] Open
Abstract
The Acadian Forest Region is a temperate-boreal transitional zone in eastern North America which provides a unique opportunity for understanding the potential effects of climate change on both forest types. Leaf phenology, the timing of leaf life cycle changes, is an important indicator of the biological effects of climate change, which can be observed with stationary timelapse cameras known as phenocams. Using four growing seasons of observations for the species Acer rubrum (red maple), Betula papyrifera (paper/white birch) and Abies balsamea (balsam fir) from the Acadian Phenocam Network as well as multiple growing season observations from the North American PhenoCam Network we parameterized eight leaf emergence and six leaf senescence models for each species which span a range in process and driver representation. With climate models from the Fifth Phase of the Coupled Model Intercomparison Project (CMIP5) we simulated future leaf emergence, senescence and season length (senescence minus emergence) for these species at sites within the Acadian Phenocam Network. Model performances were similar across models and leaf emergence model RMSE ranged from about 1 to 2 weeks across species and models, while leaf senescence model RMSE ranged from about 2 to 4 weeks. The simulations suggest that by the late 21st century, leaf senescence may become continuously delayed for boreal species like Betula papyrifera and Abies balsamea, though remain relatively stable for temperate species like Acer rubrum. In contrast, the projected advancement in leaf emergence was similar across boreal and temperate species. This has important implications for carbon uptake, nutrient resorption, ecology and ecotourism for the Acadian Forest Region. More work is needed to improve predictions of leaf phenology for the Acadian Forest Region, especially with respect to senescence. Phenocams have the potential to rapidly advance process-based model development and predictions of leaf phenology in the context of climate change.
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Affiliation(s)
- Lynsay Spafford
- Climate and EnvironmentSaint Francis Xavier UniversityAntigonishNova ScotiaCanada
- Environmental SciencesMemorial UniversitySt. John'sNewfoundland and LabradorCanada
| | - Andrew MacDougall
- Climate and EnvironmentSaint Francis Xavier UniversityAntigonishNova ScotiaCanada
| | - James Steenberg
- Nova Scotia Department of Natural Resources and RenewablesTruroNova ScotiaCanada
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5
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Schmied G, Hilmers T, Mellert KH, Uhl E, Buness V, Ambs D, Steckel M, Biber P, Šeho M, Hoffmann YD, Pretzsch H. Nutrient regime modulates drought response patterns of three temperate tree species. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 868:161601. [PMID: 36646222 DOI: 10.1016/j.scitotenv.2023.161601] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 01/09/2023] [Accepted: 01/10/2023] [Indexed: 06/17/2023]
Abstract
Against the backdrop of global change, the intensity, duration, and frequency of droughts are projected to increase and threaten forest ecosystems worldwide. Tree responses to drought are complex and likely to vary among species, drought characteristics, and site conditions. Here, we examined the drought response patterns of three major temperate tree species, s. fir (Abies alba), E. beech (Fagus sylvatica), and N. spruce (Picea abies), along an ecological gradient in the South - Central - East part of Germany that included a total of 37 sites with varying climatic and soil conditions. We relied on annual tree-ring data to assess the influence of different drought characteristics and (micro-) site conditions on components of tree resilience and to detect associated temporal changes. Our study revealed that nutrient regime, drought frequency, and hydraulic conditions in the previous and subsequent years were the main determinants of drought responses, with pronounced differences among species. Specifically, we found that (a) higher drought frequency was associated with higher resistance and resilience for N. spruce and E. beech; (b) more favorable climatic conditions in the two preceding and following years increased drought resilience and determined recovery potential of E. beech after extreme drought; (c) a site's nutrient regime, rather than micro-site differences in water availability, determined drought responses, with trees growing on sites with a balanced nutrient regime having a higher capacity to withstand extreme drought stress; (d) E. beech and N. spruce experienced a long-term decline in resilience. Our results indicate that trees under extreme drought stress benefit from a balanced nutrient supply and highlight the relevance of water availability immediately after droughts. Observed long-term trends confirm that N. spruce is suffering from persistent climatic changes, while s. fir is coping better. These findings might be especially relevant for monitoring, scenario analyses, and forest ecosystem management.
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Affiliation(s)
- Gerhard Schmied
- Chair for Forest Growth and Yield Science, TUM School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany.
| | - Torben Hilmers
- Chair for Forest Growth and Yield Science, TUM School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
| | - Karl-Heinz Mellert
- Bavarian Office for Forest Genetics, Bavarian State Ministry of Food, Agriculture and Forestry (StMELF), Forstamtsplatz 1, 83317 Teisendorf, Germany
| | - Enno Uhl
- Chair for Forest Growth and Yield Science, TUM School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany; Bavarian State Institute of Forestry (LWF), Bavarian State Ministry of Food, Agriculture and Forestry (StMELF), Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
| | - Vincent Buness
- Bavarian State Institute of Forestry (LWF), Bavarian State Ministry of Food, Agriculture and Forestry (StMELF), Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
| | - Dominik Ambs
- Chair for Forest Growth and Yield Science, TUM School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
| | - Mathias Steckel
- Forst Baden-Württemberg (AöR), State Forest Enterprise Baden-Württemberg, Germany
| | - Peter Biber
- Chair for Forest Growth and Yield Science, TUM School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
| | - Muhidin Šeho
- Bavarian Office for Forest Genetics, Bavarian State Ministry of Food, Agriculture and Forestry (StMELF), Forstamtsplatz 1, 83317 Teisendorf, Germany
| | - Yves-Daniel Hoffmann
- Bavarian Office for Forest Genetics, Bavarian State Ministry of Food, Agriculture and Forestry (StMELF), Forstamtsplatz 1, 83317 Teisendorf, Germany
| | - Hans Pretzsch
- Chair for Forest Growth and Yield Science, TUM School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
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6
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Liu Q, Peng C, Schneider R, Cyr D, McDowell NG, Kneeshaw D. Drought-induced increase in tree mortality and corresponding decrease in the carbon sink capacity of Canada's boreal forests from 1970 to 2020. GLOBAL CHANGE BIOLOGY 2023; 29:2274-2285. [PMID: 36704817 DOI: 10.1111/gcb.16599] [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: 07/20/2022] [Accepted: 01/03/2023] [Indexed: 05/28/2023]
Abstract
Canada's boreal forests, which occupy approximately 30% of boreal forests worldwide, play an important role in the global carbon budget. However, there is little quantitative information available regarding the spatiotemporal changes in the drought-induced tree mortality of Canada's boreal forests overall and their associated impacts on biomass carbon dynamics. Here, we develop spatiotemporally explicit estimates of drought-induced tree mortality and corresponding biomass carbon sink capacity changes in Canada's boreal forests from 1970 to 2020. We show that the average annual tree mortality rate is approximately 2.7%. Approximately 43% of Canada's boreal forests have experienced significantly increasing tree mortality trends (71% of which are located in the western region of the country), and these trends have accelerated since 2002. This increase in tree mortality has resulted in significant biomass carbon losses at an approximate rate of 1.51 ± 0.29 MgC ha-1 year-1 (95% confidence interval) with an approximate total loss of 0.46 ± 0.09 PgC year-1 (95% confidence interval). Under the drought condition increases predicted for this century, the capacity of Canada's boreal forests to act as a carbon sink will be further reduced, potentially leading to a significant positive climate feedback effect.
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Affiliation(s)
- Qiuyu Liu
- Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, Quebec, Canada
- Centre for Forest Research, University of Quebec at Montreal, Montreal, Quebec, Canada
| | - Changhui Peng
- Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, Quebec, Canada
- Centre for Forest Research, University of Quebec at Montreal, Montreal, Quebec, Canada
| | | | - Dominic Cyr
- Science and Technology Branch, Environment and Climate Change Canada, Gatineau, Quebec, Canada
| | - Nate G McDowell
- Atmospheric Sciences and Global Change Division, Pacific Northwest National Lab, Richland, Washington, USA
- School of Biological Sciences, Washington State University, Pullman, Washington, USA
| | - Daniel Kneeshaw
- Centre for Forest Research, University of Quebec at Montreal, Montreal, Quebec, Canada
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7
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Triviño M, Morán-Ordoñez A, Eyvindson K, Blattert C, Burgas D, Repo A, Pohjanmies T, Brotons L, Snäll T, Mönkkönen M. Future supply of boreal forest ecosystem services is driven by management rather than by climate change. GLOBAL CHANGE BIOLOGY 2023; 29:1484-1500. [PMID: 36534408 DOI: 10.1111/gcb.16566] [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: 05/09/2022] [Accepted: 11/04/2022] [Indexed: 05/26/2023]
Abstract
Forests provide a wide variety of ecosystem services (ES) to society. The boreal biome is experiencing the highest rates of warming on the planet and increasing demand for forest products. To foresee how to maximize the adaptation of boreal forests to future warmer conditions and growing demands of forest products, we need a better understanding of the relative importance of forest management and climate change on the supply of ecosystem services. Here, using Finland as a boreal forest case study, we assessed the potential supply of a wide range of ES (timber, bilberry, cowberry, mushrooms, carbon storage, scenic beauty, species habitat availability and deadwood) given seven management regimes and four climate change scenarios. We used the forest simulator SIMO to project forest dynamics for 100 years into the future (2016-2116) and estimate the potential supply of each service using published models. Then, we tested the relative importance of management and climate change as drivers of the future supply of these services using generalized linear mixed models. Our results show that the effects of management on the future supply of these ES were, on average, 11 times higher than the effects of climate change across all services, but greatly differed among them (from 0.53 to 24 times higher for timber and cowberry, respectively). Notably, the importance of these drivers substantially differed among biogeographical zones within the boreal biome. The effects of climate change were 1.6 times higher in northern Finland than in southern Finland, whereas the effects of management were the opposite-they were three times higher in the south compared to the north. We conclude that new guidelines for adapting forests to global change should account for regional differences and the variation in the effects of climate change and management on different forest ES.
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Affiliation(s)
- María Triviño
- Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
- School of Resource Wisdom, University of Jyvaskyla, Jyvaskyla, Finland
| | - Alejandra Morán-Ordoñez
- Forest Science and Technology Center of Catalonia CTCF, Solsona, Spain
- Centre for Ecological Research and Forestry Applications (CREAF), Cerdanyola del Vallès, Spain
| | - Kyle Eyvindson
- Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
- School of Resource Wisdom, University of Jyvaskyla, Jyvaskyla, Finland
- Natural Resources Institute Finland (LUKE), Helsinki, Finland
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
| | - Clemens Blattert
- Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
- School of Resource Wisdom, University of Jyvaskyla, Jyvaskyla, Finland
- Forest Resources and Management, Swiss Federal Institute WSL, Birmensdorf, Switzerland
| | - Daniel Burgas
- Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
- School of Resource Wisdom, University of Jyvaskyla, Jyvaskyla, Finland
| | - Anna Repo
- Natural Resources Institute Finland (LUKE), Helsinki, Finland
| | | | - Lluís Brotons
- Forest Science and Technology Center of Catalonia CTCF, Solsona, Spain
- Centre for Ecological Research and Forestry Applications (CREAF), Cerdanyola del Vallès, Spain
- Spanish National Research Council (CSIC), Cerdanyola del Vallès, Spain
| | - Tord Snäll
- SLU Swedish Species Information Centre, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Mikko Mönkkönen
- Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
- School of Resource Wisdom, University of Jyvaskyla, Jyvaskyla, Finland
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8
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Krutovsky KV. Dendrogenomics Is a New Interdisciplinary Field of Research of the Adaptive Genetic Potential of Forest Tree Populations Integrating Dendrochronology, Dendroecology, Dendroclimatology, and Genomics. RUSS J GENET+ 2022. [DOI: 10.1134/s1022795422110059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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9
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The Interplay of the Tree and Stand-Level Processes Mediate Drought-Induced Forest Dieback: Evidence from Complementary Remote Sensing and Tree-Ring Approaches. Ecosystems 2022. [DOI: 10.1007/s10021-022-00793-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractDrought-induced forest dieback can lead to a tipping point in community dominance, but the coupled response at the tree and stand-level response has not been properly addressed. New spatially and temporally integrated monitoring approaches that target different biological organization levels are needed. Here, we compared the temporal responses of dendrochronological and spectral indices from 1984 to 2020 at both tree and stand levels, respectively, of a drought-prone Mediterranean Pinus pinea forest currently suffering strong dieback. We test the influence of climate on temporal patterns of tree radial growth, greenness and wetness spectral indices; and we address the influence of major drought episodes on resilience metrics. Tree-ring data and spectral indices followed different spatio-temporal patterns over the study period (1984–2020). Combined information from tree growth and spectral trajectories suggests that a reduction in tree density during the mid-1990s could have promoted tree growth and reduced dieback risk. Additionally, over the last decade, extreme and recurrent droughts have resulted in crown defoliation greater than 40% in most plots since 2019. We found that tree growth and the greenness spectral index were positively related to annual precipitation, while the wetness index was positively related to mean annual temperature. The response to drought, however, was stronger for tree growth than for spectral indices. Our study demonstrates the value of long-term retrospective multiscale analyses including tree and stand-level scales to disentangle mechanisms triggering and driving forest dieback.
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10
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Slette IJ, Hoover DL, Smith MD, Knapp AK. Repeated extreme droughts decrease root production, but not the potential for post‐drought recovery of root production, in a mesic grassland. OIKOS 2022. [DOI: 10.1111/oik.08899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ingrid J. Slette
- Dept of Biology and Graduate Degree Program in Ecology, Colorado State Univ. Fort Collins CO USA
| | - David L. Hoover
- USDA‐ARS Rangeland Resources and Systems Research Unit, Crops Research Laboratory Fort Collins CO USA
| | - Melinda D. Smith
- Dept of Biology and Graduate Degree Program in Ecology, Colorado State Univ. Fort Collins CO USA
| | - Alan K. Knapp
- Dept of Biology and Graduate Degree Program in Ecology, Colorado State Univ. Fort Collins CO USA
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