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Wilkening JV, Feng X, Dawson TE, Thompson SE. Different roads, same destination: The shared future of plant ecophysiology and ecohydrology. PLANT, CELL & ENVIRONMENT 2024; 47:3447-3465. [PMID: 38725360 DOI: 10.1111/pce.14937] [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: 01/11/2024] [Revised: 04/13/2024] [Accepted: 04/23/2024] [Indexed: 08/16/2024]
Abstract
Terrestrial water fluxes are substantially mediated by vegetation, while the distribution, growth, health, and mortality of plants are strongly influenced by the availability of water. These interactions, playing out across multiple spatial and temporal scales, link the disciplines of plant ecophysiology and ecohydrology. Despite this connection, the disciplines have provided complementary, but largely independent, perspectives on the soil-plant-atmosphere continuum since their crystallization as modern scientific disciplines in the late 20th century. This review traces the development of the two disciplines, from their respective origins in engineering and ecology, their largely independent growth and maturation, and the eventual development of common conceptual and quantitative frameworks. This common ground has allowed explicit coupling of the disciplines to better understand plant function. Case studies both illuminate the limitations of the disciplines working in isolation, and reveal the exciting possibilities created by consilience between the disciplines. The histories of the two disciplines suggest opportunities for new advances will arise from sharing methodologies, working across multiple levels of complexity, and leveraging new observational technologies. Practically, these exchanges can be supported by creating shared scientific spaces. This review argues that consilience and collaboration are essential for robust and evidence-based predictions and policy responses under global change.
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Affiliation(s)
- Jean V Wilkening
- Civil, Environmental, and Geo- Engineering, University of Minnesota, Minneapolis, Minnesota, USA
- St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, Minnesota, USA
| | - Xue Feng
- Civil, Environmental, and Geo- Engineering, University of Minnesota, Minneapolis, Minnesota, USA
- St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, Minnesota, USA
| | - Todd E Dawson
- Integrative Biology, University of California, Berkeley, California, USA
- Environmental Science, Policy, and Management, University of California, Berkeley, California, USA
| | - Sally E Thompson
- Civil, Environmental, and Mining Engineering, University of Western Australia, Perth, Western Australia, Australia
- Centre for Water and Spatial Science, University of Western Australia, Perth, Western Australia, Australia
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2
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Knowles JF, Bjarke NR, Badger AM, Berkelhammer M, Biederman JA, Blanken PD, Bretfeld M, Burns SP, Ewers BE, Frank JM, Hicke JA, Lestak L, Livneh B, Reed DE, Scott RL, Molotch NP. Bark beetle impacts on forest evapotranspiration and its partitioning. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 880:163260. [PMID: 37028665 DOI: 10.1016/j.scitotenv.2023.163260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 03/10/2023] [Accepted: 03/31/2023] [Indexed: 05/27/2023]
Abstract
Insect outbreaks affect forest structure and function and represent a major category of forest disturbance globally. However, the resulting impacts on evapotranspiration (ET), and especially hydrological partitioning between the abiotic (evaporation) and biotic (transpiration) components of total ET, are not well constrained. As a result, we combined remote sensing, eddy covariance, and hydrological modeling approaches to determine the effects of bark beetle outbreak on ET and its partitioning at multiple scales throughout the Southern Rocky Mountain Ecoregion (SRME), USA. At the eddy covariance measurement scale, 85 % of the forest was affected by beetles, and water year ET as a fraction of precipitation (P) decreased by 30 % relative to a control site, with 31 % greater reductions in growing season transpiration relative to total ET. At the ecoregion scale, satellite remote sensing masked to areas of >80 % tree mortality showed corresponding ET/P reductions of 9-15 % that occurred 6-8 years post-disturbance, and indicated that the majority of the total reduction occurred during the growing season; the Variable Infiltration Capacity hydrological model showed an associated 9-18 % increase in the ecoregion runoff ratio. Long-term (16-18 year) ET and vegetation mortality datasets extend the length of previously published analyses and allowed for clear characterization of the forest recovery period. During that time, transpiration recovery outpaced total ET recovery, which was lagged in part due to persistently reduced winter sublimation, and there was associated evidence of increasing late summer vegetation moisture stress. Overall, comparison of three independent methods and two partitioning approaches demonstrated a net negative impact of bark beetles on ET, and a relatively greater negative impact on transpiration, following bark beetle outbreak in the SRME.
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Affiliation(s)
- John F Knowles
- Department of Earth and Environmental Sciences, California State University, Chico, CA, USA.
| | - Nels R Bjarke
- Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, CO, USA
| | - Andrew M Badger
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA
| | - Max Berkelhammer
- Department of Earth and Environmental Sciences, University of Illinois Chicago, Chicago, IL, USA
| | - Joel A Biederman
- Southwest Watershed Research Center, USDA Agricultural Research Service, Tucson, AZ, USA
| | - Peter D Blanken
- Department of Geography, University of Colorado Boulder, Boulder, CO, USA
| | - Mario Bretfeld
- Department of Ecology, Evolution, and Organismal Biology, Kennesaw State University, Kennesaw, GA, USA
| | - Sean P Burns
- Department of Geography, University of Colorado Boulder, Boulder, CO, USA; National Center for Atmospheric Research, Boulder, CO, USA
| | - Brent E Ewers
- Department of Botany and Program in Ecology, University of Wyoming, Laramie, WY, USA
| | - John M Frank
- Rocky Mountain Research Station, USDA Forest Service, Fort Collins, CO, USA
| | - Jeffrey A Hicke
- Department of Earth and Spatial Sciences, University of Idaho, Moscow, ID, USA
| | - Leanne Lestak
- Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, USA
| | - Ben Livneh
- Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, CO, USA; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA
| | - David E Reed
- Environmental Science, University of Science and Arts of Oklahoma, Chickasha, OK, USA
| | - Russell L Scott
- Southwest Watershed Research Center, USDA Agricultural Research Service, Tucson, AZ, USA
| | - Noah P Molotch
- Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, USA
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3
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Wang YR, Buchmann N, Hessen DO, Stordal F, Erisman JW, Vollsnes AV, Andersen T, Dolman H. Disentangling effects of natural and anthropogenic drivers on forest net ecosystem production. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 839:156326. [PMID: 35654183 DOI: 10.1016/j.scitotenv.2022.156326] [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: 03/11/2022] [Revised: 05/06/2022] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
Net Ecosystem Production (NEP) of forests is the net carbon dioxide (CO2) fluxes between land and the atmosphere due to forests' biogeochemical processes. NEP varies with natural drivers such as precipitation, air temperature, solar radiation, plant functional type (PFT), and soil texture, which affect the gross primary production and ecosystem respiration, and thus the net C sequestration. It is also known that deposition of sulphur and nitrogen influences NEP in forest ecosystems. These drivers' respective, unique effects on NEP, however, are often difficult to be individually identified by conventional bivariate analysis. Here we show that by analyzing 22 forest sites with 231 site-year data acquired from FLUXNET database across Europe for the years 2000-2014, the individual, unique effects of these drivers on annual forest CO2 fluxes can be disentangled using Generalized Additive Models (GAM) for nonlinear regression analysis. We show that S and N deposition have substantial impacts on NEP, where S deposition above 5 kg S ha-1 yr-1 can significantly reduce NEP, and N deposition around 22 kg N ha-1 yr-1 has the highest positive effect on NEP. Our results suggest that air quality management of S and N is crucial for maintaining healthy biogeochemical functions of forests to mitigate climate change. Furthermore, the empirical models we developed for estimating NEP of forests can serve as a forest management tool in the context of climate change mitigation. Potential applications include the assessment of forest carbon fluxes in the REDD+ framework of the UNFCCC.
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Affiliation(s)
- You-Ren Wang
- Centre for Biogeochemistry in the Anthropocene, University of Oslo, Oslo 0316, Norway; Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, the Netherlands.
| | - Nina Buchmann
- Department of Environmental Systems Science, ETH Zurich, Zurich 8092, Switzerland
| | - Dag O Hessen
- Centre for Biogeochemistry in the Anthropocene, University of Oslo, Oslo 0316, Norway
| | - Frode Stordal
- Centre for Biogeochemistry in the Anthropocene, University of Oslo, Oslo 0316, Norway
| | - Jan Willem Erisman
- Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, the Netherlands; Institute of Environmental Sciences, Leiden University, Leiden 2311, the Netherlands
| | - Ane Victoria Vollsnes
- Centre for Biogeochemistry in the Anthropocene, University of Oslo, Oslo 0316, Norway
| | - Tom Andersen
- Centre for Biogeochemistry in the Anthropocene, University of Oslo, Oslo 0316, Norway
| | - Han Dolman
- Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, the Netherlands; Royal Netherlands Institute for Sea Research, Texel 1797 SZ, the Netherlands
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4
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Gazol A, Camarero JJ, Sánchez-Salguero R, Zavala MA, Serra-Maluquer X, Gutiérrez E, de Luis M, Sangüesa-Barreda G, Novak K, Rozas V, Tíscar PA, Linares JC, Martínez Del Castillo E, Ribas M, García-González I, Silla F, Camison Á, Génova M, Olano JM, Hereş AM, Yuste JC, Longares LA, Hevia A, Galván JD, Ruiz-Benito P. Tree growth response to drought partially explains regional-scale growth and mortality patterns in Iberian forests. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2022; 32:e2589. [PMID: 35333426 DOI: 10.1002/eap.2589] [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: 12/11/2020] [Revised: 10/07/2021] [Accepted: 10/18/2021] [Indexed: 06/14/2023]
Abstract
Tree-ring data has been widely used to inform about tree growth responses to drought at the individual scale, but less is known about how tree growth sensitivity to drought scales up driving changes in forest dynamics. Here, we related tree-ring growth chronologies and stand-level forest changes in basal area from two independent data sets to test if tree-ring responses to drought match stand forest dynamics (stand basal area growth, ingrowth, and mortality). We assessed if tree growth and changes in forest basal area covary as a function of spatial scale and tree taxa (gymnosperm or angiosperm). To this end, we compared a tree-ring network with stand data from the Spanish National Forest Inventory. We focused on the cumulative impact of drought on tree growth and demography in the period 1981-2005. Drought years were identified by the Standardized Precipitation Evapotranspiration Index, and their impacts on tree growth by quantifying tree-ring width reductions. We hypothesized that forests with greater drought impacts on tree growth will also show reduced stand basal area growth and ingrowth and enhanced mortality. This is expected to occur in forests dominated by gymnosperms on drought-prone regions. Cumulative growth reductions during dry years were higher in forests dominated by gymnosperms and presented a greater magnitude and spatial autocorrelation than for angiosperms. Cumulative drought-induced tree growth reductions and changes in forest basal area were related, but initial stand density and basal area were the main factors driving changes in basal area. In drought-prone gymnosperm forests, we observed that sites with greater growth reductions had lower stand basal area growth and greater mortality. Consequently, stand basal area, forest growth, and ingrowth in regions with large drought impacts was significantly lower than in regions less impacted by drought. Tree growth sensitivity to drought can be used as a predictor of gymnosperm demographic rates in terms of stand basal area growth and ingrowth at regional scales, but further studies may try to disentangle how initial stand density modulates such relationships. Drought-induced growth reductions and their cumulative impacts have strong potential to be used as early-warning indicators of regional forest vulnerability.
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Affiliation(s)
- Antonio Gazol
- Instituto Pirenaico de Ecología (IPE-CSIC), Zaragoza, Spain
| | | | - Raúl Sánchez-Salguero
- Instituto Pirenaico de Ecología (IPE-CSIC), Zaragoza, Spain
- Departamento de Sistemas Físicos, Químicos y Naturales, Univ. Pablo de Olavide, Sevilla, Spain
| | - Miguel A Zavala
- Universidad de Alcalá, Grupo de Ecología y Restauración Forestal, Departamento Ciencias de la Vida, Campus Universitario, Madrid, Spain
| | | | - Emilia Gutiérrez
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
| | - Martín de Luis
- Departamento de Geografía y Ordenación del Territorio - IUCA, Universidad de Zaragoza, Zaragoza, Spain
| | - Gabriel Sangüesa-Barreda
- Instituto Pirenaico de Ecología (IPE-CSIC), Zaragoza, Spain
- EiFAB-iuFOR, Campus Duques de Soria, University of Valladolid, Soria, Spain
| | - Klemen Novak
- Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
- Departamento de Ecología, Universidad de Alicante, Alicante, Spain
| | - Vicente Rozas
- EiFAB-iuFOR, Campus Duques de Soria, University of Valladolid, Soria, Spain
| | - Pedro A Tíscar
- Centro de Capacitación y Experimentación Forestal, Cazorla, Spain
| | - Juan C Linares
- Departamento de Sistemas Físicos, Químicos y Naturales, Univ. Pablo de Olavide, Sevilla, Spain
| | | | - Montse Ribas
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
| | - Ignacio García-González
- Departamento de Botánica, Escola Politécnica Superior de Enxeñaría, Campus Terra, Universidade de Santiago de Compostela, Lugo, Spain
| | - Fernando Silla
- Departamento de Biología Animal, Parasitología, Ecología, Edafología y Química Agrícola, Universidad de Salamanca, Salamanca, Spain
| | - Álvaro Camison
- Ingeniería Forestal y del Medio Natural, Universidad de Extremadura, Plasencia, Spain
| | - Mar Génova
- Departamento de Sistemas y Recursos Naturales, Universidad Politécnica de Madrid, Madrid, Spain
| | - José M Olano
- EiFAB-iuFOR, Campus Duques de Soria, University of Valladolid, Soria, Spain
| | - Ana-Maria Hereş
- Department of Forest Sciences, Transilvania University of Braşov, Braşov, Romania
- Basque Centre for Climate Change (BC3), Leioa, Spain
| | - Jorge Curiel Yuste
- Basque Centre for Climate Change (BC3), Leioa, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - Luis A Longares
- Departamento de Geografía y Ordenación del Territorio - IUCA, Universidad de Zaragoza, Zaragoza, Spain
| | - Andrea Hevia
- Departamento de Ciencias Agroforestales, Universidad de Huelva, Huelva, Spain
| | | | - Paloma Ruiz-Benito
- Universidad de Alcalá, Grupo de Ecología y Restauración Forestal, Departamento Ciencias de la Vida, Campus Universitario, Madrid, Spain
- Remote Sensing Research Group, Department of Geology, Geography and Environment, University of Alcalá, Alcalá de Henares, Spain
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5
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Harrison Day BL, Carins-Murphy MR, Brodribb TJ. Reproductive water supply is prioritized during drought in tomato. PLANT, CELL & ENVIRONMENT 2022; 45:69-79. [PMID: 34705293 DOI: 10.1111/pce.14206] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 10/09/2021] [Accepted: 10/10/2021] [Indexed: 06/13/2023]
Abstract
Reproductive success largely defines the fitness of plant species. Understanding how heat and drought affect plant reproduction is thus key to predicting future plant fitness under rising global temperatures. Recent work suggests reproductive tissues are highly vulnerable to water stress in perennial plants where reproductive sacrifice could preserve plant survival. However, most crop species are annuals where such a strategy would theoretically reduce fitness. We examined the reproductive strategy of tomato (Solanum lycopersicum var. Rheinlands Ruhm) to determine whether water supply to fruits is prioritized above vegetative tissues during drought. Using optical methods, we mapped xylem cavitation and tissue shrinkage in vegetative and reproductive organs during dehydration to determine the priority of water flow under acute water stress. Stems and peduncles of tomato showed significantly greater xylem cavitation resistance than leaves. This maintenance of intact water supply enabled tomato fruit to continue to expand during acute water stress, utilizing xylem water made available by tissue collapse and early cavitation of leaves. Here, tomato plants prioritize water supply to reproductive tissues, maintaining fruit development under drought conditions. These results emphasize the critical role of water transport in shaping life history and suggest a broad relevance of hydraulic prioritization in plant ecology.
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Affiliation(s)
| | | | - Timothy J Brodribb
- School of Natural Sciences, University of Tasmania, Hobart, Tasmania, Australia
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6
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Sena PHA, Fonsêca NC, Lins-e-Silva ACB. Non-negligible role of dead organic matter in a rainforest remnant in Northeast Brazil. RODRIGUÉSIA 2022. [DOI: 10.1590/2175-7860202273041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract Dead organic matter represents an essential reservoir of carbon, especially that allocated in standing dead trees, coarse woody debris, and fine litter, playing a pivotal role in nutrient cycling and habitat provisioning. However, necromass is frequently disregarded in forest assessments. Here, we aimed to perform the first assessment of multiple necromass compartments in the Atlantic Forest of Northeast Brazil, providing a basis for future integrative studies related to necromass in this region. We registered 17 standing dead trees in 0.5 hectare and 239 logs of coarse woody debris. Necromass had 3.9 Mg.ha-1 of standing dead trees, 54.24 Mg.ha-1 of coarse woody debris and 7.2 Mg.ha-1 of litter. We indicate that standing dead trees and coarse debris were mostly in the intermediate and final stages of decomposition. Leaves were the dominant component of litter, and drier months had more litterfall. Finally, we highlight that assessing standing dead trees and coarse woody debris adds 25.6% on top of aboveground tree mass, improving information about organic matter storage in rainforest ecosystems. Our findings emphasize that the necromass compartment must be considered in forest assessments, also including small pieces of coarse woody debris, which could inform better practices of forest management.
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7
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Gough CM, Bohrer G, Hardiman BS, Nave LE, Vogel CS, Atkins JW, Bond-Lamberty B, Fahey RT, Fotis AT, Grigri MS, Haber LT, Ju Y, Kleinke CL, Mathes KC, Nadelhoffer KJ, Stuart-Haëntjens E, Curtis PS. Disturbance-accelerated succession increases the production of a temperate forest. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2021; 31:e02417. [PMID: 34278647 DOI: 10.1002/eap.2417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/19/2021] [Accepted: 03/22/2021] [Indexed: 06/13/2023]
Abstract
Many secondary deciduous forests of eastern North America are approaching a transition in which mature early-successional trees are declining, resulting in an uncertain future for this century-long carbon (C) sink. We initiated the Forest Accelerated Succession Experiment (FASET) at the University of Michigan Biological Station to examine the patterns and mechanisms underlying forest C cycling following the stem girdling-induced mortality of >6,700 early-successional Populus spp. (aspen) and Betula papyrifera (paper birch). Meteorological flux tower-based C cycling observations from the 33-ha treatment forest have been paired with those from a nearby unmanipulated forest since 2008. Following over a decade of observations, we revisit our core hypothesis: that net ecosystem production (NEP) would increase following the transition to mid-late-successional species dominance due to increased canopy structural complexity. Supporting our hypothesis, NEP was stable, briefly declined, and then increased relative to the control in the decade following disturbance; however, increasing NEP was not associated with rising structural complexity but rather with a rapid 1-yr recovery of total leaf area index as mid-late-successional Acer, Quercus, and Pinus assumed canopy dominance. The transition to mid-late-successional species dominance improved carbon-use efficiency (CUE = NEP/gross primary production) as ecosystem respiration declined. Similar soil respiration rates in control and treatment forests, along with species differences in leaf physiology and the rising relative growth rates of mid-late-successional species in the treatment forest, suggest changes in aboveground plant respiration and growth were primarily responsible for increases in NEP. We conclude that deciduous forests transitioning from early to middle succession are capable of sustained or increased NEP, even when experiencing extensive tree mortality. This adds to mounting evidence that aging deciduous forests in the region will function as C sinks for decades to come.
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Affiliation(s)
- Christopher M Gough
- Department of Biology, Virginia Commonwealth University, Box 842012, 1000 West Cary Street, Richmond, Virginia, 23284, USA
| | - Gil Bohrer
- Department of Civil, Environmental and Geodetic Engineering, Ohio State University, 2070 Neil Avenue, Columbus, Ohio, 43210, USA
| | - Brady S Hardiman
- Forestry and Natural Resources and Environmental and Ecological Engineering, Purdue University, West Lafayette, Indiana, 47907, USA
| | - Lucas E Nave
- Biological Station and Department of Ecology and Evolutionary Biology, University of Michigan, Pellston, Michigan, 49769, USA
| | - Christoph S Vogel
- Biological Station and Department of Ecology and Evolutionary Biology, University of Michigan, Pellston, Michigan, 49769, USA
| | - Jeff W Atkins
- Department of Biology, Virginia Commonwealth University, Box 842012, 1000 West Cary Street, Richmond, Virginia, 23284, USA
| | - Ben Bond-Lamberty
- Joint Global Change Research Institute, Pacific Northwest National Laboratory, 5825 University Research Court, College Park, Maryland, 20740, USA
| | - Robert T Fahey
- Department of Natural Resources and the Environment, Center for Environmental Sciences and Engineering, University of Connecticut, 1376 Storrs Road, Storrs, Connecticut, 06269, USA
| | - Alexander T Fotis
- Department of Evolution, Ecology, and Organismal Biology, Ohio State University, 318 W 12th Avenue, Columbus, Ohio, 43210, USA
| | - Maxim S Grigri
- Department of Biology, Virginia Commonwealth University, Box 842012, 1000 West Cary Street, Richmond, Virginia, 23284, USA
| | - Lisa T Haber
- Department of Biology, Virginia Commonwealth University, Box 842012, 1000 West Cary Street, Richmond, Virginia, 23284, USA
| | - Yang Ju
- Department of Civil, Environmental and Geodetic Engineering, Ohio State University, 2070 Neil Avenue, Columbus, Ohio, 43210, USA
| | - Callie L Kleinke
- Department of Civil, Environmental and Geodetic Engineering, Ohio State University, 2070 Neil Avenue, Columbus, Ohio, 43210, USA
| | - Kayla C Mathes
- Department of Biology, Virginia Commonwealth University, Box 842012, 1000 West Cary Street, Richmond, Virginia, 23284, USA
| | - Knute J Nadelhoffer
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, 48109, USA
| | - Ellen Stuart-Haëntjens
- Department of Biology, Virginia Commonwealth University, Box 842012, 1000 West Cary Street, Richmond, Virginia, 23284, USA
| | - Peter S Curtis
- Department of Evolution, Ecology, and Organismal Biology, Ohio State University, 318 W 12th Avenue, Columbus, Ohio, 43210, USA
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8
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Raczka B, Hoar TJ, Duarte HF, Fox AM, Anderson JL, Bowling DR, Lin JC. Improving CLM5.0 Biomass and Carbon Exchange Across the Western United States Using a Data Assimilation System. JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS 2021; 13:e2020MS002421. [PMID: 34434490 PMCID: PMC8365651 DOI: 10.1029/2020ms002421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 05/25/2021] [Accepted: 06/11/2021] [Indexed: 06/13/2023]
Abstract
The Western United States is dominated by natural lands that play a critical role for carbon balance, water quality, and timber reserves. This region is also particularly vulnerable to forest mortality from drought, insect attack, and wildfires, thus requiring constant monitoring to assess ecosystem health. Carbon monitoring techniques are challenged by the complex mountainous terrain, thus there is an opportunity for data assimilation systems that combine land surface models and satellite-derived observations to provide improved carbon monitoring. Here, we use the Data Assimilation Research Testbed to adjust the Community Land Model (CLM5.0) with remotely sensed observations of leaf area and above-ground biomass. The adjusted simulation significantly reduced the above-ground biomass and leaf area, leading to a reduction in both photosynthesis and respiration fluxes. The reduction in the carbon fluxes mostly offset, thus both the adjusted and free simulation projected a weak carbon sink to the land. This result differed from a separate observation-constrained model (FLUXCOM) that projected strong carbon uptake to the land. Simulation diagnostics suggested water limitation had an important influence upon the magnitude and spatial pattern of carbon uptake through photosynthesis. We recommend that additional observations important for water cycling (e.g., snow water equivalent, land surface temperature) be included to improve the veracity of the spatial pattern in carbon uptake. Furthermore, the assimilation system should be enhanced to maximize the number of the simulated state variables that are adjusted, especially those related to the recommended observed quantities including water cycling and soil carbon.
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Affiliation(s)
- Brett Raczka
- School of Biological SciencesUniversity of UtahSalt Lake CityUTUSA
- Now at National Center for Atmospheric ResearchBoulderCOUSA
| | | | - Henrique F. Duarte
- Department of Atmospheric SciencesUniversity of UtahSalt Lake CityUTUSA
- Now at Earth System Science CenterNational Institute for Space ResearchSão José dos CamposBrazil
| | - Andrew M. Fox
- Joint Center for Satellite Data AssimilationBoulderCOUSA
| | | | - David R. Bowling
- School of Biological SciencesUniversity of UtahSalt Lake CityUTUSA
- Department of Atmospheric SciencesUniversity of UtahSalt Lake CityUTUSA
| | - John C. Lin
- Department of Atmospheric SciencesUniversity of UtahSalt Lake CityUTUSA
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9
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Joseph J, Luster J, Bottero A, Buser N, Baechli L, Sever K, Gessler A. Effects of drought on nitrogen uptake and carbon dynamics in trees. TREE PHYSIOLOGY 2021; 41:927-943. [PMID: 33147631 DOI: 10.1093/treephys/tpaa146] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 10/29/2020] [Indexed: 05/21/2023]
Abstract
Research on drought impact on tree functioning is focussed primarily on water and carbon (C) dynamics. Changes in nutrient uptake might also affect tree performance under drought and there is a need to explore underlying mechanisms. We investigated effects of drought on (a) in situ nitrogen (N) uptake, accounting for both, N availability to fine roots in soil and actual N uptake, (b) physiological N uptake capacity of roots and (c) the availability of new assimilates to fine roots influencing the N uptake capacity using 15N and 13C labelling. We assessed saplings of six different tree species (Acer pseudoplatanus L., Fagus sylvatica L., Quercus petraea (Mattuschka) Liebl., Abies alba Mill., Picea abies (L.) H.Karst. and Pinus sylvestris L.). Drought resulted in significant reduction of in situ soil N uptake in deciduous trees accompanied by reduced C allocation to roots and by a reduction in root biomass available for N uptake. Although physiological root N uptake capacity was not affected by drought in deciduous saplings, reduced maximum ammonium but not nitrate uptake was observed for A. alba and P. abies. Our results indicate that drought has species-specific effects on N uptake. Even water limitations of only 5 weeks as assessed here can decrease whole-plant inorganic N uptake, independent of whether the physiological N uptake capacity is affected or not.
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Affiliation(s)
- Jobin Joseph
- Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Jörg Luster
- Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Alessandra Bottero
- Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Nathalie Buser
- Universitätsklinik für Hals, Nasen- und Ohrenkrankheiten Kopf- und Halschirurgie, Freiburgstrasse-16, 3010 Bern, Switzerland
| | - Lukas Baechli
- Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Krunoslav Sever
- Faculty of Forestry, Department of Forest Genetics, Dendrology and Botany, University of Zagreb, Svetošimunska cesta 25, 10000 Zagreb, Croatia
| | - Arthur Gessler
- Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
- Institute of Terrestrial Ecosystems, ETH Zurich, 8092 Zurich, Switzerland
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10
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Abstract
Population-level scaling in ecological systems arises from individual growth and death with competitive constraints. We build on a minimal dynamical model of metabolic growth where the tension between individual growth and mortality determines population size distribution. We then separately include resource competition based on shared capture area. By varying rates of growth, death, and competitive attrition, we connect regular and random spatial patterns across sessile organisms from forests to ants, termites, and fairy circles. Then, we consider transient temporal dynamics in the context of asymmetric competition, such as canopy shading or large colony dominance, whose effects primarily weaken the smaller of two competitors. When such competition couples slow timescales of growth to fast competitive death, it generates population shocks and demographic oscillations similar to those observed in forest data. Our minimal quantitative theory unifies spatiotemporal patterns across sessile organisms through local competition mediated by the laws of metabolic growth, which in turn, are the result of long-term evolutionary dynamics.
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11
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Bhattarai P, Zheng Z, Bhatta KP, Adhikari YP, Zhang Y. Climate-Driven Plant Response and Resilience on the Tibetan Plateau in Space and Time: A Review. PLANTS (BASEL, SWITZERLAND) 2021; 10:480. [PMID: 33806382 PMCID: PMC7998909 DOI: 10.3390/plants10030480] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 02/17/2021] [Accepted: 02/19/2021] [Indexed: 11/20/2022]
Abstract
Climate change variation on a small scale may alter the underlying processes determining a pattern operating at large scale and vice versa. Plant response to climate change on individual plant levels on a fine scale tends to change population structure, community composition and ecosystem processes and functioning. Therefore, we reviewed the literature on plant response and resilience to climate change in space and time at different scales on the Tibetan Plateau. We report that spatiotemporal variation in temperature and precipitation dynamics drives the vegetation and ecosystem function on the Tibetan Plateau (TP), following the water-energy dynamics hypothesis. Increasing temperature with respect to time increased the net primary productivity (NPP) on most parts of the Tibetan Plateau, but the productivity dynamics on some parts were constrained by 0.3 °C decade-1 rising temperature. Moreover, we report that accelerating studies on plant community assemblage and their contribution to ecosystem functioning may help to identify the community response and resilience to climate extremes. Furthermore, records on species losses help to build the sustainable management plan for the entire Tibetan Plateau. We recommend that incorporating long-term temporal data with multiple factor analyses will be helpful to formulate the appropriate measures for a healthy ecosystem on the Tibetan Plateau.
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Affiliation(s)
- Prakash Bhattarai
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (P.B.); (Z.Z.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhoutao Zheng
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (P.B.); (Z.Z.)
| | - Kuber Prasad Bhatta
- Department of Biological Sciences, University of Bergen, N-5020 Bergen, Norway;
| | - Yagya Prasad Adhikari
- Department of Biogeography, BayCEER, University of Bayreuth, 95447 Bayreuth, Germany;
| | - Yangjian Zhang
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (P.B.); (Z.Z.)
- University of Chinese Academy of Sciences, Beijing 100049, China
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12
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Gessler A, Bottero A, Marshall J, Arend M. The way back: recovery of trees from drought and its implication for acclimation. THE NEW PHYTOLOGIST 2020; 228:1704-1709. [PMID: 32452535 DOI: 10.1111/nph.16703] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Affiliation(s)
- Arthur Gessler
- Forest Dynamics, Swiss Federal Research Institute WSL, Zürcherstrasse 111, Birmensdorf, 8903, Switzerland
- Institute of Terrestrial Ecosystems, ETH Zurich, Universitätsstrasse 16, Zurich, 8092, Switzerland
- SwissForestLab, Birmensdorf, Zürcherstrasse 111, Birmensdorf, 8903, Switzerland
| | - Alessandra Bottero
- Forest Dynamics, Swiss Federal Research Institute WSL, Zürcherstrasse 111, Birmensdorf, 8903, Switzerland
- SwissForestLab, Birmensdorf, Zürcherstrasse 111, Birmensdorf, 8903, Switzerland
| | - John Marshall
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Skogens ekologi och skötsel, Umeå, 901 83, Sweden
| | - Matthias Arend
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, Basel, 4056, Switzerland
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13
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Carbon Balance and Streamflow at a Small Catchment Scale 10 Years after the Severe Natural Disturbance in the Tatra Mts, Slovakia. WATER 2020. [DOI: 10.3390/w12102917] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Natural disturbances (windthrow, bark beetle, and fire) have reduced forest cover in the Tatra National Park (Slovakia) by 50% since the year 2004. We analyzed carbon fluxes and streamflow ten years after the forest destruction in three small catchments which differ in size, land cover, disturbance type and post-disturbance management. Point-wise CO2 fluxes were estimated by chamber methods for vegetation-dominated land-use types and extrapolated over the catchments using the site-specific regressions with environmental variables. Streamflow characteristics in the pre- and post-disturbance periods (water years of 1965–2004 and 2005–2014, respectively) were compared to identify changes in hydrological cycle initiated by the disturbances. Mature Norway spruce forest which was carbon neutral, turned to carbon source (330 ± 98 gC m−2 y−1) just one year after the wind disturbance. After ten years most of the windthrow sites acted as carbon sinks (from −341 ± 92.1 up to −463 ± 178 gC m−2 y−1). In contrast, forest stands strongly infested by bark beetles regenerated much slowly and on average emitted 495 ± 176 gC m−2 year−1. Ten years after the forest destruction, annual carbon balance in studied catchments was almost neutral in the least disturbed catchment. Carbon uptake notably exceeded its release in the most severely disturbed catchment (by windthrow and fire), where net ecosystem exchange (NEE) was −206 ± 115 gC m−2. The amount of sequestered carbon in studied catchments was driven by the extent of fast-growing successional vegetation cover (represented by the leaf area index LAI) rather than by the disturbance or vegetation types. Different post-disturbance management has not influenced the carbon balance yet. Streamflow characteristics did not indicate significant changes in the hydrological cycle. However, greater cumulative decadal runoff, different median monthly flows and low flows and the greater number of flow reversals in the in the first years after the windthrow in two severely affected catchments could be partially related to the influence of the disturbances.
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15
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Huber N, Bugmann H, Lafond V. Capturing ecological processes in dynamic forest models: why there is no silver bullet to cope with complexity. Ecosphere 2020. [DOI: 10.1002/ecs2.3109] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Affiliation(s)
- Nica Huber
- Forest Ecology Institute of Terrestrial Ecosystems Department of Environmental Systems Science ETH Zurich Zurich Switzerland
| | - Harald Bugmann
- Forest Ecology Institute of Terrestrial Ecosystems Department of Environmental Systems Science ETH Zurich Zurich Switzerland
| | - Valentine Lafond
- Forest Ecology Institute of Terrestrial Ecosystems Department of Environmental Systems Science ETH Zurich Zurich Switzerland
- Faculty of Forestry Department of Forest Resources Management University of British Columbia Vancouver British Columbia Canada
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16
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Kannenberg SA, Schwalm CR, Anderegg WRL. Ghosts of the past: how drought legacy effects shape forest functioning and carbon cycling. Ecol Lett 2020; 23:891-901. [DOI: 10.1111/ele.13485] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 12/29/2019] [Accepted: 02/12/2020] [Indexed: 01/06/2023]
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17
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Dirnböck T, Kraus D, Grote R, Klatt S, Kobler J, Schindlbacher A, Seidl R, Thom D, Kiese R. Substantial understory contribution to the C sink of a European temperate mountain forest landscape. LANDSCAPE ECOLOGY 2020; 35:483-499. [PMID: 32165789 PMCID: PMC7045765 DOI: 10.1007/s10980-019-00960-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 12/10/2019] [Indexed: 06/10/2023]
Abstract
CONTEXT The contribution of forest understory to the temperate forest carbon sink is not well known, increasing the uncertainty in C cycling feedbacks on global climate as estimated by Earth System Models. OBJECTIVES We aimed at quantifying the effect of woody and non-woody understory vegetation on net ecosystem production (NEP) for a forested area of 158 km2 in the European Alps. METHODS We simulated C dynamics for the period 2000-2014, characterized by above-average temperatures, windstorms and a subsequent bark beetle outbreak for the area, using the regional ecosystem model LandscapeDNDC. RESULTS In the entire study area, woody and non-woody understory vegetation caused between 16 and 37% higher regional NEP as compared to a bare soil scenario over the 15-year period. The mean annual contribution of the understory to NEP was in the same order of magnitude as the average annual European (EU-25) forest C sink. After wind and bark beetle disturbances, the understory effect was more pronounced, leading to an increase in NEP between 35 and 67% compared to simulations not taking into account these components. CONCLUSIONS Our findings strongly support the importance of processes related to the understory in the context of the climate change mitigation potential of temperate forest ecosystems. The expected increases in stand replacing disturbances due to climate change call for a better representation of understory vegetation dynamics and its effect on the ecosystem C balance in regional assessments and Earth System Models.
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Affiliation(s)
- T. Dirnböck
- Department for Ecosystem Research and Environmental Information Management, Environment Agency Austria, Spittelauer Lände 5, 1090 Vienna, Austria
| | - D. Kraus
- Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, Germany
| | - R. Grote
- Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, Germany
| | - S. Klatt
- Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, Germany
| | - J. Kobler
- Department for Ecosystem Research and Environmental Information Management, Environment Agency Austria, Spittelauer Lände 5, 1090 Vienna, Austria
| | - A. Schindlbacher
- Department of Forest Ecology, Federal Research and Training Centre for Forests, Natural Hazards and Landscape (BFW), Seckendorff-Gudent Weg 8, 1131 Vienna, Austria
| | - R. Seidl
- Department of Forest- and Soil Sciences, Institute of Silviculture, 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
| | - D. Thom
- Department of Forest- and Soil Sciences, Institute of Silviculture, University of Natural Resources and Life Sciences (BOKU) Vienna, Peter-Jordan Straße 82, 1190 Vienna, Austria
- Rubenstein School of Environment and Natural Resources, University of Vermont, 81 Carrigan Drive, Burlington, VT 05405 USA
- Ecosystem Dynamics and Forest Management Group, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
| | - R. Kiese
- Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, Germany
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18
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Zhang S, Shao L, Sun Z, Huang Y, Liu N. An atmospheric pollutant (inorganic nitrogen) alters the response of evergreen broad-leaved tree species to extreme drought. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 187:109750. [PMID: 31655412 DOI: 10.1016/j.ecoenv.2019.109750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 09/30/2019] [Accepted: 10/01/2019] [Indexed: 06/10/2023]
Abstract
Drought and nitrogen (N) deposition are important components of global climate and environmental change. In this greenhouse study, we investigated the ecophysiological responses of the seedlings of three subtropical forest plant species (Schima superba, Castanopsis fissa, and Michelia macclurei) to short-term experimental drought stress, N addition, and their interaction. The results showed that drought stress reduced the activities of antioxidant enzymes [superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)] and total antioxidant capacity (T-AOC), but increased the malondialdehyde (MDA), abscisic acid (ABA), and proline (PRO) contents in plants. The PRO content, T-AOC, and antioxidant enzyme activities were increased, and ABA and MDA contents were decreased by N addition alone. Furthermore, N addition under drought stress increased antioxidant enzymes activities, PRO content, and T-AOC. The treatments, however, did not significantly affect the chlorophyll fluorescence parameters of the species. T-AOC was positively correlated with antioxidant enzyme activities in each species, indicating that antioxidant enzymes were important for plant resistance to oxidative stress. MDA content increased with the increase of ABA content, indicating that ABA may help regulate stomatal movement and drought-induced oxidative injury in plants. T-AOC was positively correlated with PRO content, probably because PRO participated in osmotic regulation of cells and increased osmotic stress resistance. These results indicate that N addition can reduce drought stress of subtropical forest plants and will help researchers predict how evergreen broad-leaved forests will respond to global change in the future.
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Affiliation(s)
- Shike Zhang
- CAS Engineering Laboratory for Ecological Restoration of Islands and Coastal Zones, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ling Shao
- School of Food Pharmaceutical Engineering, Zhao Qing University, Zhaoqing, 526061, China
| | - Zhongyu Sun
- Guangdong Open Laboratory of Geospatial Information Technology and Application, Guangzhou Institute of Geography, Guangzhou, 510070, China
| | - Yao Huang
- CAS Engineering Laboratory for Ecological Restoration of Islands and Coastal Zones, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Nan Liu
- CAS Engineering Laboratory for Ecological Restoration of Islands and Coastal Zones, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
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19
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Bojórquez A, Álvarez-Yépiz JC, Búrquez A, Martínez-Yrízar A. Understanding and predicting frost-induced tropical tree mortality patterns. GLOBAL CHANGE BIOLOGY 2019; 25:3817-3828. [PMID: 31344294 DOI: 10.1111/gcb.14775] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 06/28/2019] [Accepted: 07/13/2019] [Indexed: 06/10/2023]
Abstract
Extreme climatic and weather events are increasing in frequency and intensity across the world causing episodes of widespread tree mortality in many forested ecosystems. However, we have a limited understanding about which local factors influence tree mortality patterns, restricting our ability to predict tree mortality, especially within topographically complex tropical landscapes with a matrix of mature and secondary forests. We investigated the effects of two major local factors, topography and forest successional type, on climate-induced tropical tree mortality patterns using an observational and modeling approach. The northernmost Neotropical dry forest endured an unprecedented episode of frost-induced tree mortality after the historic February 2011 cold wave hit northwestern Mexico. In a moderately hilly landscape covering mature and secondary tropical dry forests, we surveyed 454 sites for the presence or absence of frost-induced tree mortality. In addition, across forty-eight 1 ha plots equally split into the two forest types, we examined 6,981 woody plants to estimate a frost-disturbance severity metric using the density of frost-killed trees. Elevation is the main factor modulating frost effects regardless of forest type. Higher occurrence probabilities of frost-induced tree mortality at lowland forests can be explained by the strong influence of elevation on temperature distribution since heavier cold air masses move downhill during advective frosts. Holding elevation constant, the probability of frost-induced tree mortality in mature forests was twice that of secondary forests but severity showed the opposite pattern, suggesting a cautious use of occurrence probabilities of tree mortality to infer severity of climate-driven disturbances. Extreme frost events, in addition to altering forest successional pathways and ecosystem services, likely maintain and could ultimately shift latitudinal and altitudinal range margins of Neotropical dry forests.
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Affiliation(s)
- Adrián Bojórquez
- Instituto de Ecología, Universidad Nacional Autónoma de México, Hermosillo, Mexico
| | | | - Alberto Búrquez
- Instituto de Ecología, Universidad Nacional Autónoma de México, Hermosillo, Mexico
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20
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Kannenberg SA, Novick KA, Alexander MR, Maxwell JT, Moore DJP, Phillips RP, Anderegg WRL. Linking drought legacy effects across scales: From leaves to tree rings to ecosystems. GLOBAL CHANGE BIOLOGY 2019; 25:2978-2992. [PMID: 31132225 DOI: 10.1111/gcb.14710] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 05/10/2019] [Accepted: 05/22/2019] [Indexed: 05/23/2023]
Abstract
Severe drought can cause lagged effects on tree physiology that negatively impact forest functioning for years. These "drought legacy effects" have been widely documented in tree-ring records and could have important implications for our understanding of broader scale forest carbon cycling. However, legacy effects in tree-ring increments may be decoupled from ecosystem fluxes due to (a) postdrought alterations in carbon allocation patterns; (b) temporal asynchrony between radial growth and carbon uptake; and (c) dendrochronological sampling biases. In order to link legacy effects from tree rings to whole forests, we leveraged a rich dataset from a Midwestern US forest that was severely impacted by a drought in 2012. At this site, we compiled tree-ring records, leaf-level gas exchange, eddy flux measurements, dendrometer band data, and satellite remote sensing estimates of greenness and leaf area before, during, and after the 2012 drought. After accounting for the relative abundance of tree species in the stand, we estimate that legacy effects led to ~10% reductions in tree-ring width increments in the year following the severe drought. Despite this stand-scale reduction in radial growth, we found that leaf-level photosynthesis, gross primary productivity (GPP), and vegetation greenness were not suppressed in the year following the 2012 drought. Neither temporal asynchrony between radial growth and carbon uptake nor sampling biases could explain our observations of legacy effects in tree rings but not in GPP. Instead, elevated leaf-level photosynthesis co-occurred with reduced leaf area in early 2013, indicating that resources may have been allocated away from radial growth in conjunction with postdrought upregulation of photosynthesis and repair of canopy damage. Collectively, our results indicate that tree-ring legacy effects were not observed in other canopy processes, and that postdrought canopy allocation could be an important mechanism that decouples tree-ring signals from GPP.
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Affiliation(s)
| | - Kimberly A Novick
- School of Public and Environmental Affairs, Indiana University, Bloomington, Indiana
| | | | - Justin T Maxwell
- Department of Geography, Indiana University, Bloomington, Indiana
- Harvard Forest, Harvard University, Petersham, Massachusetts
| | - David J P Moore
- School of Natural Resources and the Environment, University of Arizona, Tucson, Arizona
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21
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Contrasting Response to Drought and Climate of Planted and Natural Pinus pinaster Aiton Forests in Southern Spain. FORESTS 2019. [DOI: 10.3390/f10070603] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Extreme drought events and increasing aridity are leading to forest decline and tree mortality, particularly in populations near the limits of the species distribution. Therefore, a better understanding of the growth response to drought and climate change could show the vulnerability of forests and enable predictions of future dieback. In this study, we used a dendrochronological approach to assess the response to drought in natural and planted forests of the maritime pine (Pinus pinaster Aiton) located in its southernmost distribution (south of Spain). In addition, we investigated how environmental variables (climatic and site conditions) and structural factors drive radial growth along the biogeographic and ecological gradients. Our results showed contrasting growth responses to drought of natural and planted stands, but these differences were not significant after repeated drought periods. Additionally, we found differences in the climate–growth relationships when comparing more inland sites (wet previous winter and late spring precipitation) and sites located closer to the coast (early spring precipitation). Response functions emphasized the negative effect of defoliation and drought, expressed as the June standard precipitation-evapotranspiration index calculated for the 12-month temporal scale and the mean temperature in the current February, on growth. The strong relationship between climatic variables and growth enabled acceptable results to be obtained in a modeling approach. The study and characterization of this tree species’ response to drought will help to improve the adaptive management of forests under climate change.
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22
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Palomino J, Kelly M. Differing Sensitivities to Fire Disturbance Result in Large Differences Among Remotely Sensed Products of Vegetation Disturbance. Ecosystems 2019. [DOI: 10.1007/s10021-019-00367-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Bugmann H, Seidl R, Hartig F, Bohn F, Brůna J, Cailleret M, François L, Heinke J, Henrot A, Hickler T, Hülsmann L, Huth A, Jacquemin I, Kollas C, Lasch‐Born P, Lexer MJ, Merganič J, Merganičová K, Mette T, Miranda BR, Nadal‐Sala D, Rammer W, Rammig A, Reineking B, Roedig E, Sabaté S, Steinkamp J, Suckow F, Vacchiano G, Wild J, Xu C, Reyer CPO. Tree mortality submodels drive simulated long-term forest dynamics: assessing 15 models from the stand to global scale. Ecosphere 2019; 10:e02616. [PMID: 34853712 PMCID: PMC8609442 DOI: 10.1002/ecs2.2616] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 12/28/2018] [Indexed: 01/08/2023] Open
Abstract
Models are pivotal for assessing future forest dynamics under the impacts of changing climate and management practices, incorporating representations of tree growth, mortality, and regeneration. Quantitative studies on the importance of mortality submodels are scarce. We evaluated 15 dynamic vegetation models (DVMs) regarding their sensitivity to different formulations of tree mortality under different degrees of climate change. The set of models comprised eight DVMs at the stand scale, three at the landscape scale, and four typically applied at the continental to global scale. Some incorporate empirically derived mortality models, and others are based on experimental data, whereas still others are based on theoretical reasoning. Each DVM was run with at least two alternative mortality submodels. Model behavior was evaluated against empirical time series data, and then, the models were subjected to different scenarios of climate change. Most DVMs matched empirical data quite well, irrespective of the mortality submodel that was used. However, mortality submodels that performed in a very similar manner against past data often led to sharply different trajectories of forest dynamics under future climate change. Most DVMs featured high sensitivity to the mortality submodel, with deviations of basal area and stem numbers on the order of 10-40% per century under current climate and 20-170% under climate change. The sensitivity of a given DVM to scenarios of climate change, however, was typically lower by a factor of two to three. We conclude that (1) mortality is one of the most uncertain processes when it comes to assessing forest response to climate change, and (2) more data and a better process understanding of tree mortality are needed to improve the robustness of simulated future forest dynamics. Our study highlights that comparing several alternative mortality formulations in DVMs provides valuable insights into the effects of process uncertainties on simulated future forest dynamics.
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24
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Exploring the Sensitivity of Subtropical Stand Aboveground Productivity to Local and Regional Climate Signals in South China. FORESTS 2019. [DOI: 10.3390/f10010071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Subtropical forest productivity is significantly affected by both natural disturbances (local and regional climate changes) and anthropogenic activities (harvesting and planting). Monthly measures of forest aboveground productivity from natural forests (primary and secondary forests) and plantations (mixed and single-species forests) were developed to explore the sensitivity of subtropical mountain productivity to the fluctuating characteristics of climate change in South China, spanning the 35-year period from 1981 to 2015. Statistical analysis showed that climate regulation differed across different forest types. The monthly average maximum temperature, precipitation, and streamflow were positively correlated with primary and mixed-forest aboveground net primary productivity (ANPP) and its components: Wood productivity (WP) and canopy productivity (CP). However, the monthly average maximum temperature, precipitation, and streamflow were negatively correlated with secondary and single-species forest ANPP and its components. The number of dry days and minimum temperature were positively associated with secondary and single-species forest productivity, but inversely associated with primary and mixed forest productivity. The multivariate ENSO (EI Niño-Southern Oscillation) index (MEI), computed based on sea level pressure, surface temperature, surface air temperature, and cloudiness over the tropical Pacific Ocean, was significantly correlated with local monthly maximum and minimum temperatures (Tmax and Tmin), precipitation (PRE), streamflow (FLO), and the number of dry days (DD), as well as the monthly means of primary and mixed forest aboveground productivity. In particular, the mean maximum temperature increased by 2.5, 0.9, 6.5, and 0.9 °C, and the total forest aboveground productivity decreased by an average of 5.7%, 3.0%, 2.4%, and 7.8% in response to the increased extreme high temperatures and drought events during the 1986/1988, 1997/1998, 2006/2007, and 2009/2010 EI Niño periods, respectively. Subsequently, the total aboveground productivity values increased by an average of 1.1%, 3.0%, 0.3%, and 8.6% because of lagged effects after the wet La Niña periods. The main conclusions of this study demonstrated that the influence of local and regional climatic fluctuations on subtropical forest productivity significantly differed across different forests, and community position and plant diversity differences among different forest types may prevent the uniform response of subtropical mountain aboveground productivity to regional climate anomalies. Therefore, these findings may be useful for forecasting climate-induced variation in forest aboveground productivity as well as for selecting tree species for planting in reforestation practices.
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Kannenberg SA, Maxwell JT, Pederson N, D'Orangeville L, Ficklin DL, Phillips RP. Drought legacies are dependent on water table depth, wood anatomy and drought timing across the eastern US. Ecol Lett 2018; 22:119-127. [DOI: 10.1111/ele.13173] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 09/08/2018] [Accepted: 09/26/2018] [Indexed: 01/16/2023]
Affiliation(s)
- Steven A. Kannenberg
- School of Biological Sciences University of Utah Salt Lake City UT84112USA
- Department of Biology Indiana University Bloomington IN47405 USA
| | | | - Neil Pederson
- Harvard Forest Harvard University Petersham MA10366 USA
| | - Loïc D'Orangeville
- School of Biological Sciences University of Utah Salt Lake City UT84112USA
- Faculty of Forestry and Environmental Management University of New Brunswick Fredericton NBE3B 5A3 Canada
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Leitold V, Morton DC, Longo M, Dos-Santos MN, Keller M, Scaranello M. El Niño drought increased canopy turnover in Amazon forests. THE NEW PHYTOLOGIST 2018; 219:959-971. [PMID: 29577319 DOI: 10.1111/nph.15110] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 02/11/2018] [Indexed: 05/28/2023]
Abstract
Amazon droughts, including the 2015-2016 El Niño, may reduce forest net primary productivity and increase canopy tree mortality, thereby altering both the short- and the long-term net forest carbon balance. Given the broad extent of drought impacts, inventory plots or eddy flux towers may not capture regional variability in forest response to drought. We used multi-temporal airborne Lidar data and field measurements of coarse woody debris to estimate patterns of canopy turnover and associated carbon losses in intact and fragmented forests in the central Brazilian Amazon between 2013-2014 and 2014-2016. Average annualized canopy turnover rates increased by 65% during the drought period in both intact and fragmented forests. The average size and height of turnover events was similar for both time intervals, in contrast to expectations that the 2015-2016 El Niño drought would disproportionally affect large trees. Lidar-biomass relationships between canopy turnover and field measurements of coarse woody debris were modest (R2 ≈ 0.3), given similar coarse woody debris production and Lidar-derived changes in canopy volume from single tree and multiple branch fall events. Our findings suggest that El Niño conditions accelerated canopy turnover in central Amazon forests, increasing coarse woody debris production by 62% to 1.22 Mg C ha-1 yr-1 in drought years .
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Affiliation(s)
- Veronika Leitold
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
- Department of Geographical Sciences, University of Maryland, College Park, MD, 20742, USA
| | | | - Marcos Longo
- EMBRAPA Informática Agropecuária, Barão Geraldo, Campinas, 13083-886, SP, Brazil
| | | | - Michael Keller
- EMBRAPA Informática Agropecuária, Barão Geraldo, Campinas, 13083-886, SP, Brazil
- NASA Jet Propulsion Laboratory, Pasadena, CA, 91109, USA
- USDA Forest Service, International Institute of Tropical Forestry, Rio Piedras, PR, 00926, USA
| | - Marcos Scaranello
- EMBRAPA Informática Agropecuária, Barão Geraldo, Campinas, 13083-886, SP, Brazil
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Rogers BM, Solvik K, Hogg EH, Ju J, Masek JG, Michaelian M, Berner LT, Goetz SJ. Detecting early warning signals of tree mortality in boreal North America using multiscale satellite data. GLOBAL CHANGE BIOLOGY 2018; 24:2284-2304. [PMID: 29481709 DOI: 10.1111/gcb.14107] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 02/12/2018] [Indexed: 05/19/2023]
Abstract
Increasing tree mortality from global change drivers such as drought and biotic infestations is a widespread phenomenon, including in the boreal zone where climate changes and feedbacks to the Earth system are relatively large. Despite the importance for science and management communities, our ability to forecast tree mortality at landscape to continental scales is limited. However, two independent information streams have the potential to inform and improve mortality forecasts: repeat forest inventories and satellite remote sensing. Time series of tree-level growth patterns indicate that productivity declines and related temporal dynamics often precede mortality years to decades before death. Plot-level productivity, in turn, has been related to satellite-based indices such as the Normalized difference vegetation index (NDVI). Here we link these two data sources to show that early warning signals of mortality are evident in several NDVI-based metrics up to 24 years before death. We focus on two repeat forest inventories and three NDVI products across western boreal North America where productivity and mortality dynamics are influenced by periodic drought. These data sources capture a range of forest conditions and spatial resolution to highlight the sensitivity and limitations of our approach. Overall, results indicate potential to use satellite NDVI for early warning signals of mortality. Relationships are broadly consistent across inventories, species, and spatial resolutions, although the utility of coarse-scale imagery in the heterogeneous aspen parkland was limited. Longer-term NDVI data and annually remeasured sites with high mortality levels generate the strongest signals, although we still found robust relationships at sites remeasured at a typical 5 year frequency. The approach and relationships developed here can be used as a basis for improving forest mortality models and monitoring systems.
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Affiliation(s)
| | | | - Edward H Hogg
- Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada, Edmonton, AB, Canada
| | - Junchang Ju
- Biospheric Science Laboratory (Code 618), NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Jeffrey G Masek
- Biospheric Science Laboratory (Code 618), NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Michael Michaelian
- Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada, Edmonton, AB, Canada
| | - Logan T Berner
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, USA
| | - Scott J Goetz
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, USA
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28
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Oberle B, Ogle K, Zanne AE, Woodall CW. When a tree falls: Controls on wood decay predict standing dead tree fall and new risks in changing forests. PLoS One 2018; 13:e0196712. [PMID: 29742158 PMCID: PMC5942820 DOI: 10.1371/journal.pone.0196712] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 04/18/2018] [Indexed: 12/04/2022] Open
Abstract
When standing dead trees (snags) fall, they have major impacts on forest ecosystems. Snag fall can redistribute wildlife habitat and impact public safety, while governing important carbon (C) cycle consequences of tree mortality because ground contact accelerates C emissions during deadwood decay. Managing the consequences of altered snag dynamics in changing forests requires predicting when snags fall as wood decay erodes mechanical resistance to breaking forces. Previous studies have pointed to common predictors, such as stem size, degree of decay and species identity, but few have assessed the relative strength of underlying mechanisms driving snag fall across biomes. Here, we analyze nearly 100,000 repeated snag observations from boreal to subtropical forests across the eastern United States to show that wood decay controls snag fall in ways that could generate previously unrecognized forest-climate feedback. Warmer locations where wood decays quickly had much faster rates of snag fall. The effect of temperature on snag fall was so strong that in a simple forest C model, anticipated warming by mid-century reduced snag C by 22%. Furthermore, species-level differences in wood decay resistance (durability) accurately predicted the timing of snag fall. Differences in half-life for standing dead trees were similar to expected differences in the service lifetimes of wooden structures built from their timber. Strong effects of temperature and wood durability imply future forests where dying trees fall and decay faster than at present, reducing terrestrial C storage and snag-dependent wildlife habitat. These results can improve the representation of forest C cycling and assist forest managers by helping predict when a dead tree may fall.
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Affiliation(s)
- Brad Oberle
- Department of Biological Sciences, George Washington University, Washington, DC, United States of America
- Center for Conservation and Sustainable Development, Missouri Botanical Garden, St. Louis, Missouri, United States of America
- Division of Natural Sciences, New College of Florida, Sarasota, Florida, United States of America
- * E-mail:
| | - Kiona Ogle
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, Arizona, United States of America
| | - Amy E. Zanne
- Department of Biological Sciences, George Washington University, Washington, DC, United States of America
- Center for Conservation and Sustainable Development, Missouri Botanical Garden, St. Louis, Missouri, United States of America
| | - Christopher W. Woodall
- Northern Forest Science and Applications, Northern Research Station, Durham, New Hampshire, United States of America
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Kautz M, Anthoni P, Meddens AJH, Pugh TAM, Arneth A. Simulating the recent impacts of multiple biotic disturbances on forest carbon cycling across the United States. GLOBAL CHANGE BIOLOGY 2018; 24:2079-2092. [PMID: 29105233 DOI: 10.1111/gcb.13974] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 10/13/2017] [Indexed: 06/07/2023]
Abstract
Biotic disturbances (BDs, for example, insects, pathogens, and wildlife herbivory) substantially affect boreal and temperate forest ecosystems globally. However, accurate impact assessments comprising larger spatial scales are lacking to date although these are critically needed given the expected disturbance intensification under a warming climate. Hence, our quantitative knowledge on current and future BD impacts, for example, on forest carbon (C) cycling, is strongly limited. We extended a dynamic global vegetation model to simulate ecosystem response to prescribed tree mortality and defoliation due to multiple biotic agents across United States forests during the period 1997-2015, and quantified the BD-induced vegetation C loss, that is, C fluxes from live vegetation to dead organic matter pools. Annual disturbance fractions separated by BD type (tree mortality and defoliation) and agent (bark beetles, defoliator insects, other insects, pathogens, and other biotic agents) were calculated at 0.5° resolution from aerial-surveyed data and applied within the model. Simulated BD-induced C fluxes totaled 251.6 Mt C (annual mean: 13.2 Mt C year-1 , SD ±7.3 Mt C year-1 between years) across the study domain, to which tree mortality contributed 95% and defoliation 5%. Among BD agents, bark beetles caused most C fluxes (61%), and total insect-induced C fluxes were about five times larger compared to non-insect agents, for example, pathogens and wildlife. Our findings further demonstrate that BD-induced C cycle impacts (i) displayed high spatio-temporal variability, (ii) were dominated by different agents across BD types and regions, and (iii) were comparable in magnitude to fire-induced impacts. This study provides the first ecosystem model-based assessment of BD-induced impacts on forest C cycling at the continental scale and going beyond single agent-host systems, thus allowing for comparisons across regions, BD types, and agents. Ultimately, a perspective on the potential and limitations of a more process-based incorporation of multiple BDs in ecosystem models is offered.
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Affiliation(s)
- Markus Kautz
- Institute of Meteorology and Climate Research - Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen, Germany
| | - Peter Anthoni
- Institute of Meteorology and Climate Research - Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen, Germany
| | - Arjan J H Meddens
- Department of Natural Resources and Society, University of Idaho, Moscow, ID, USA
| | - Thomas A M Pugh
- Institute of Meteorology and Climate Research - Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen, Germany
- School of Geography, Earth & Environmental Sciences and Birmingham Institute of Forest Research, University of Birmingham, Birmingham, UK
| | - Almut Arneth
- Institute of Meteorology and Climate Research - Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen, Germany
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30
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Gazol A, Camarero JJ, Sangüesa-Barreda G, Vicente-Serrano SM. Post-drought Resilience After Forest Die-Off: Shifts in Regeneration, Composition, Growth and Productivity. FRONTIERS IN PLANT SCIENCE 2018; 9:1546. [PMID: 30410500 PMCID: PMC6210004 DOI: 10.3389/fpls.2018.01546] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 10/03/2018] [Indexed: 05/12/2023]
Abstract
A better understanding on the consequences of drought on forests can be reached by paying special attention to their resilience capacity, i.e., the ability to return to a state similar to pre-drought conditions. Nevertheless, extreme droughts may surpass the threshold for the resilience capacity triggering die-off causing multiple changes at varying spatial and temporal scales and affecting diverse processes (tree growth and regeneration, ecosystem productivity). Combining several methodological tools allows reaching a comprehensive characterization of post-drought forest resilience. We evaluated the changes in the abundance, regeneration capacity (seedling abundance), and radial growth (annual tree rings) of the main tree species. We also assessed if drought-induced reductions in growth and regeneration of the dominant tree species scale-up to drops in vegetation productivity by using the Normalized Difference Vegetation Index (NDVI). We studied two conifer forests located in north-eastern Spain which displayed drought-induced die-off during the last decades: a Scots pine (Pinus sylvestris) forest under continental Mediterranean conditions and a Silver fir (Abies alba) forest under more temperate conditions. We found a strong negative impact of a recent severe drought (2012) on Scots pine growth, whereas the coexisting Juniperus thurifera showed positive trends in basal area increment (0.02 ± 0.003 cm2 yr-1). No Scots pine recruitment was observed in sites with intense die-off, but J. thurifera and Quercus ilex recruited. The 2012 drought event translated into a strong NDVI reduction (32% lower than the 1982-2014 average). In Silver fir we found a negative impact of the 2012 drought on short-term radial growth, whilst long-term growth of Silver fir and the coexisting Fagus sylvatica showed positive trends. Growth rates were higher in F. sylvatica (0.04 ± 0.003 cm2 yr-1) than in A. alba (0.02 ± 0.004 cm2 yr-1). These two species recruited beneath declining and non-declining Silver fir trees. The 2012 drought translated into a strong NDVI reduction which lasted until 2013. The results presented here suggest two different post-drought vegetation pathways. In the Scots pine forest, the higher growth and recruitment rates of J. thurifera correspond to a vegetation shift where Scots pine is being replaced by the drought-tolerant juniper. Conversely, in the Silver fir forest there is an increase of F. sylvatica growth and abundance but no local extinction of the Silver fir. Further research is required to monitor the evolution of these forests in the forthcoming years to illustrate the cumulative impacts of drought on successional dynamics.
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Affiliation(s)
- Antonio Gazol
- Instituto Pirenaico de Ecología (IPE-CSIC), Zaragoza, Spain
| | - J. Julio Camarero
- Instituto Pirenaico de Ecología (IPE-CSIC), Zaragoza, Spain
- *Correspondence: J. Julio Camarero,
| | - Gabriel Sangüesa-Barreda
- Instituto Pirenaico de Ecología (IPE-CSIC), Zaragoza, Spain
- Departamento de Ciencias Agroforestales, EU de Ingenierías Agrarias, Universidad de Valladolid, Soria, Spain
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31
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Cailleret M, Dakos V, Jansen S, Robert EMR, Aakala T, Amoroso MM, Antos JA, Bigler C, Bugmann H, Caccianaga M, Camarero JJ, Cherubini P, Coyea MR, Čufar K, Das AJ, Davi H, Gea-Izquierdo G, Gillner S, Haavik LJ, Hartmann H, Hereş AM, Hultine KR, Janda P, Kane JM, Kharuk VI, Kitzberger T, Klein T, Levanic T, Linares JC, Lombardi F, Mäkinen H, Mészáros I, Metsaranta JM, Oberhuber W, Papadopoulos A, Petritan AM, Rohner B, Sangüesa-Barreda G, Smith JM, Stan AB, Stojanovic DB, Suarez ML, Svoboda M, Trotsiuk V, Villalba R, Westwood AR, Wyckoff PH, Martínez-Vilalta J. Early-Warning Signals of Individual Tree Mortality Based on Annual Radial Growth. FRONTIERS IN PLANT SCIENCE 2018; 9:1964. [PMID: 30713543 PMCID: PMC6346433 DOI: 10.3389/fpls.2018.01964] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 12/18/2018] [Indexed: 05/22/2023]
Abstract
Tree mortality is a key driver of forest dynamics and its occurrence is projected to increase in the future due to climate change. Despite recent advances in our understanding of the physiological mechanisms leading to death, we still lack robust indicators of mortality risk that could be applied at the individual tree scale. Here, we build on a previous contribution exploring the differences in growth level between trees that died and survived a given mortality event to assess whether changes in temporal autocorrelation, variance, and synchrony in time-series of annual radial growth data can be used as early warning signals of mortality risk. Taking advantage of a unique global ring-width database of 3065 dead trees and 4389 living trees growing together at 198 sites (belonging to 36 gymnosperm and angiosperm species), we analyzed temporal changes in autocorrelation, variance, and synchrony before tree death (diachronic analysis), and also compared these metrics between trees that died and trees that survived a given mortality event (synchronic analysis). Changes in autocorrelation were a poor indicator of mortality risk. However, we found a gradual increase in inter-annual growth variability and a decrease in growth synchrony in the last ∼20 years before mortality of gymnosperms, irrespective of the cause of mortality. These changes could be associated with drought-induced alterations in carbon economy and allocation patterns. In angiosperms, we did not find any consistent changes in any metric. Such lack of any signal might be explained by the relatively high capacity of angiosperms to recover after a stress-induced growth decline. Our analysis provides a robust method for estimating early-warning signals of tree mortality based on annual growth data. In addition to the frequently reported decrease in growth rates, an increase in inter-annual growth variability and a decrease in growth synchrony may be powerful predictors of gymnosperm mortality risk, but not necessarily so for angiosperms.
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Affiliation(s)
- Maxime Cailleret
- Department of Environmental Systems Science, Forest Ecology, Institute of Terrestrial Ecosystems, ETH Zürich, Zurich, Switzerland
- Swiss Federal Institute for Forest, Snow and Landscape Research – WSL, Birmensdorf, Switzerland
- *Correspondence: Maxime Cailleret,
| | - Vasilis Dakos
- CNRS, IRD, EPHE, ISEM, Université de Montpellier, Montpellier, France
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Ulm, Germany
| | - Elisabeth M. R. Robert
- CREAF, Cerdanyola del Vallès, Catalonia, Spain
- Ecology and Biodiversity, Vrije Universiteit Brussel, Brussels, Belgium
- Laboratory of Wood Biology and Xylarium, Royal Museum for Central Africa, Tervuren, Belgium
| | - Tuomas Aakala
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
| | - Mariano M. Amoroso
- Consejo Nacional de Investigaciones Científicas y Técnicas, CCT Patagonia Norte, Río Negro, Argentina
- Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural, Sede Andina, Universidad Nacional de Río Negro, Río Negro, Argentina
| | - Joe A. Antos
- Department of Biology, University of Victoria, Victoria, BC, Canada
| | - Christof Bigler
- Department of Environmental Systems Science, Forest Ecology, Institute of Terrestrial Ecosystems, ETH Zürich, Zurich, Switzerland
| | - Harald Bugmann
- Department of Environmental Systems Science, Forest Ecology, Institute of Terrestrial Ecosystems, ETH Zürich, Zurich, Switzerland
| | - Marco Caccianaga
- Dipartimento di Bioscienze, Università degli Studi di Milano, Milan, Italy
| | | | - Paolo Cherubini
- Swiss Federal Institute for Forest, Snow and Landscape Research – WSL, Birmensdorf, Switzerland
| | - Marie R. Coyea
- Centre for Forest Research, Département des Sciences du Bois et de la Forêt, Faculté de Foresterie, de Géographie et de Géomatique, Université Laval, Québec, QC, Canada
| | - Katarina Čufar
- Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Adrian J. Das
- United States Geological Survey, Western Ecological Research Center, Sequoia and Kings Canyon Field Station, Three Rivers, CA, United States
| | - Hendrik Davi
- Ecologie des Forêts Méditerranéennes (URFM), Institut National de la Recherche Agronomique, Avignon, France
| | - Guillermo Gea-Izquierdo
- Centro de Investigación Forestal (CIFOR), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
| | - Sten Gillner
- Institute of Forest Botany and Forest Zoology, TU Dresden, Dresden, Germany
| | - Laurel J. Haavik
- USDA Forest Service, Forest Health Protection, Saint Paul, MN, United States
- Department of Entomology, University of Arkansas, Fayetteville, AR, United States
| | - Henrik Hartmann
- Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, Germany
| | - Ana-Maria Hereş
- Department of Forest Sciences, Transilvania University of Brasov, Brașov, Romania
- BC3 – Basque Centre for Climate Change, Leioa, Spain
| | - Kevin R. Hultine
- Department of Research, Conservation and Collections, Desert Botanical Garden, Phoenix, AZ, United States
| | - Pavel Janda
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czechia
| | - Jeffrey M. Kane
- Department of Forestry and Wildland Resources, Humboldt State University, Arcata, CA, United States
| | - Viachelsav I. Kharuk
- Sukachev Institute of Forest, Siberian Division of the Russian Academy of Sciences, Krasnoyarsk, Russia
- Siberian Federal University, Krasnoyarsk, Russia
| | - Thomas Kitzberger
- Department of Ecology, Universidad Nacional del Comahue, Río Negro, Argentina
- Instituto de Investigaciones en Biodiversidad y Medioambiente, Consejo Nacional de Investigaciones Científicas y Técnicas, Río Negro, Argentina
| | - Tamir Klein
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Tom Levanic
- Department of Yield and Silviculture, Slovenian Forestry Institute, Ljubljana, Slovenia
| | - Juan-Carlos Linares
- Department of Physical, Chemical and Natural Systems, Pablo de Olavide University, Seville, Spain
| | - Fabio Lombardi
- Department of Agricultural Science, Mediterranean University of Reggio Calabria, Reggio Calabria, Italy
| | - Harri Mäkinen
- Natural Resources Institute Finland (Luke), Espoo, Finland
| | - Ilona Mészáros
- Department of Botany, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Juha M. Metsaranta
- Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada, Edmonton, AB, Canada
| | - Walter Oberhuber
- Department of Botany, University of Innsbruck, Innsbruck, Austria
| | - Andreas Papadopoulos
- Department of Forestry and Natural Environment Management, Technological Educational Institute of Stereas Elladas, Karpenisi, Greece
| | - Any Mary Petritan
- Swiss Federal Institute for Forest, Snow and Landscape Research – WSL, Birmensdorf, Switzerland
- National Institute for Research and Development in Forestry “Marin Dracea”, Voluntari, Romania
| | - Brigitte Rohner
- Swiss Federal Institute for Forest, Snow and Landscape Research – WSL, Birmensdorf, Switzerland
| | | | - Jeremy M. Smith
- Department of Geography, University of Colorado, Boulder, CO, United States
| | - Amanda B. Stan
- Department of Geography, Planning and Recreation, Northern Arizona University, Flagstaff, AZ, United States
| | - Dejan B. Stojanovic
- Institute of Lowland Forestry and Environment, University of Novi Sad, Novi Sad, Serbia
| | - Maria-Laura Suarez
- Grupo Ecología Forestal, CONICET – INTA, EEA Bariloche, Bariloche, Argentina
| | - Miroslav Svoboda
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czechia
| | - Volodymyr Trotsiuk
- Swiss Federal Institute for Forest, Snow and Landscape Research – WSL, Birmensdorf, Switzerland
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czechia
- Department of Environmental Systems Science, Institute of Agricultural Sciences, ETH Zürich, Zurich, Switzerland
| | - Ricardo Villalba
- Laboratorio de Dendrocronología e Historia Ambiental, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, CCT CONICET Mendoza, Mendoza, Argentina
| | - Alana R. Westwood
- Boreal Avian Modelling Project, Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada
| | - Peter H. Wyckoff
- Department of Biology, University of Minnesota, Morris, Morris, MN, United States
| | - Jordi Martínez-Vilalta
- CREAF, Cerdanyola del Vallès, Catalonia, Spain
- Departament de Biologia Animal, de Biologia Vegetal i d’Ecologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
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32
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Felton AJ, Smith MD. Integrating plant ecological responses to climate extremes from individual to ecosystem levels. Philos Trans R Soc Lond B Biol Sci 2017; 372:20160142. [PMID: 28483872 PMCID: PMC5434093 DOI: 10.1098/rstb.2016.0142] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/10/2017] [Indexed: 01/28/2023] Open
Abstract
Climate extremes will elicit responses from the individual to the ecosystem level. However, only recently have ecologists begun to synthetically assess responses to climate extremes across multiple levels of ecological organization. We review the literature to examine how plant responses vary and interact across levels of organization, focusing on how individual, population and community responses may inform ecosystem-level responses in herbaceous and forest plant communities. We report a high degree of variability at the individual level, and a consequential inconsistency in the translation of individual or population responses to directional changes in community- or ecosystem-level processes. The scaling of individual or population responses to community or ecosystem responses is often predicated upon the functional identity of the species in the community, in particular, the dominant species. Furthermore, the reported stability in plant community composition and functioning with respect to extremes is often driven by processes that operate at the community level, such as species niche partitioning and compensatory responses during or after the event. Future research efforts would benefit from assessing ecological responses across multiple levels of organization, as this will provide both a holistic and mechanistic understanding of ecosystem responses to increasing climatic variability.This article is part of the themed issue 'Behavioural, ecological and evolutionary responses to extreme climatic events'.
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Affiliation(s)
- Andrew J Felton
- Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA
| | - Melinda D Smith
- Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA
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33
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Cailleret M, Jansen S, Robert EMR, Desoto L, Aakala T, Antos JA, Beikircher B, Bigler C, Bugmann H, Caccianiga M, Čada V, Camarero JJ, Cherubini P, Cochard H, Coyea MR, Čufar K, Das AJ, Davi H, Delzon S, Dorman M, Gea-Izquierdo G, Gillner S, Haavik LJ, Hartmann H, Hereş AM, Hultine KR, Janda P, Kane JM, Kharuk VI, Kitzberger T, Klein T, Kramer K, Lens F, Levanic T, Linares Calderon JC, Lloret F, Lobo-Do-Vale R, Lombardi F, López Rodríguez R, Mäkinen H, Mayr S, Mészáros I, Metsaranta JM, Minunno F, Oberhuber W, Papadopoulos A, Peltoniemi M, Petritan AM, Rohner B, Sangüesa-Barreda G, Sarris D, Smith JM, Stan AB, Sterck F, Stojanović DB, Suarez ML, Svoboda M, Tognetti R, Torres-Ruiz JM, Trotsiuk V, Villalba R, Vodde F, Westwood AR, Wyckoff PH, Zafirov N, Martínez-Vilalta J. A synthesis of radial growth patterns preceding tree mortality. GLOBAL CHANGE BIOLOGY 2017; 23:1675-1690. [PMID: 27759919 DOI: 10.1111/gcb.13535] [Citation(s) in RCA: 175] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 09/12/2016] [Accepted: 10/11/2016] [Indexed: 05/23/2023]
Abstract
Tree mortality is a key factor influencing forest functions and dynamics, but our understanding of the mechanisms leading to mortality and the associated changes in tree growth rates are still limited. We compiled a new pan-continental tree-ring width database from sites where both dead and living trees were sampled (2970 dead and 4224 living trees from 190 sites, including 36 species), and compared early and recent growth rates between trees that died and those that survived a given mortality event. We observed a decrease in radial growth before death in ca. 84% of the mortality events. The extent and duration of these reductions were highly variable (1-100 years in 96% of events) due to the complex interactions among study species and the source(s) of mortality. Strong and long-lasting declines were found for gymnosperms, shade- and drought-tolerant species, and trees that died from competition. Angiosperms and trees that died due to biotic attacks (especially bark-beetles) typically showed relatively small and short-term growth reductions. Our analysis did not highlight any universal trade-off between early growth and tree longevity within a species, although this result may also reflect high variability in sampling design among sites. The intersite and interspecific variability in growth patterns before mortality provides valuable information on the nature of the mortality process, which is consistent with our understanding of the physiological mechanisms leading to mortality. Abrupt changes in growth immediately before death can be associated with generalized hydraulic failure and/or bark-beetle attack, while long-term decrease in growth may be associated with a gradual decline in hydraulic performance coupled with depletion in carbon reserves. Our results imply that growth-based mortality algorithms may be a powerful tool for predicting gymnosperm mortality induced by chronic stress, but not necessarily so for angiosperms and in case of intense drought or bark-beetle outbreaks.
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Affiliation(s)
- Maxime Cailleret
- Forest Ecology, Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zürich, Universitätstrasse 22, 8092, Zürich, Switzerland
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Elisabeth M R Robert
- CREAF, Campus UAB, 08193, Cerdanyola del Vallès, Spain
- Laboratory of Plant Biology and Nature Management (APNA), Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussels, Belgium
- Laboratory of Wood Biology and Xylarium, Royal Museum for Central Africa (RMCA), Leuvensesteenweg 13, 3080, Tervuren, Belgium
| | - Lucía Desoto
- Department of Life Sciences, Centre for Functional Ecology, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal
| | - Tuomas Aakala
- Department of Forest Sciences, University of Helsinki, P.O. Box 27 (Latokartanonkaari 7), 00014, Helsinki, Finland
| | - Joseph A Antos
- Department of Biology, University of Victoria, PO Box 3020, STN CSC, Victoria, BC, V8W 3N5, Canada
| | - Barbara Beikircher
- Institute of Botany, University of Innsbruck, Sternwartestrasse 15, 6020, Innsbruck, Austria
| | - Christof Bigler
- Forest Ecology, Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zürich, Universitätstrasse 22, 8092, Zürich, Switzerland
| | - Harald Bugmann
- Forest Ecology, Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zürich, Universitätstrasse 22, 8092, Zürich, Switzerland
| | - Marco Caccianiga
- Dipartimento di Bioscienze, Università degli Studi di Milano, Via Giovanni Celoria 26, 20133, Milano, Italy
| | - Vojtěch Čada
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 961/129, 165 21, Praha 6-Suchdol, Czech Republic
| | - Jesus J Camarero
- Instituto Pirenaico de Ecología (IPE-CSIC), Avenida Montañana 1005, 50192, Zaragoza, Spain
| | - Paolo Cherubini
- Swiss Federal Institute for Forest, Snow and Landscape Research - WSL, Zürcherstrasse 111, 8903, Birmensdorf, Switzerland
| | - Hervé Cochard
- Unité Mixte de Recherche (UMR) 547 PIAF, Institut National de la Recherche Agronomique (INRA), Université Clermont Auvergne, 63100, Clermont-Ferrand, France
| | - Marie R Coyea
- Département des sciences du bois et de la forêt, Centre for Forest Research, Faculté de foresterie, de géographie et de géomatique, Université Laval, 2405 rue de la Terrasse, Québec, QC, G1V 0A6, Canada
| | - Katarina Čufar
- Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000, Ljubljana, Slovenia
| | - Adrian J Das
- U.S. Geological Survey, Western Ecological Research Center, 47050 Generals Highway, Three Rivers, CA, 93271, USA
| | - Hendrik Davi
- Ecologie des Forest Méditerranéennes (URFM), Institut National de la Recherche Agronomique (INRA), Domaine Saint Paul, Site Agroparc, 84914, Avignon Cedex 9, France
| | - Sylvain Delzon
- Unité Mixte de Recherche (UMR) 1202 BIOGECO, Institut National de la Recherche Agronomique (INRA), Université de Bordeaux, 33615, Pessac, France
| | - Michael Dorman
- Department of Geography and Environmental Development, Ben-Gurion University of the Negev, 84105, Beer-Sheva, Israel
| | - Guillermo Gea-Izquierdo
- Centro de Investigación Forestal (CIFOR), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Carretera La Coruña km 7.5, 28040, Madrid, Spain
| | - Sten Gillner
- Institute of Forest Botany and Forest Zoology, TU Dresden, 01062, Dresden, Germany
- Fachgebiet Vegetationstechnik und Pflanzenverwendung, Institut für Landschaftsarchitektur und Umweltplanung, TU Berlin, 10623, Berlin, Germany
| | - Laurel J Haavik
- Department of Entomology, University of Arkansas, Fayetteville, AR, 72701, USA
- Department of Ecology and Evolutionary Biology, University of Kansas, 1450 Jayhawk Boulevard, Lawrence, KS, 66045, USA
| | - Henrik Hartmann
- Max-Planck Institute for Biogeochemistry, Hans Knöll Strasse 10, 07745, Jena, Germany
| | - Ana-Maria Hereş
- CREAF, Campus UAB, 08193, Cerdanyola del Vallès, Spain
- Department of Biogeography and Global Change, National Museum of Natural History (MNCN), Consejo Superior de Investigaciones Científicas (CSIC), C/Serrano 115bis, 28006, Madrid, Spain
| | - Kevin R Hultine
- Department of Research, Conservation and Collections, Desert Botanical Garden, 1201 N Galvin Parkway, Phoenix, AZ, USA
| | - Pavel Janda
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 961/129, 165 21, Praha 6-Suchdol, Czech Republic
| | - Jeffrey M Kane
- Department of Forestry and Wildland Resources, Humboldt State University, 1 Harpst Street, Arcata, CA, 95521, USA
| | - Vyacheslav I Kharuk
- Siberian Division of the Russian Academy of Sciences (RAS), Sukachev Institute of Forest, Krasnoyarsk, 660036, Russia
| | - Thomas Kitzberger
- Department of Ecology, Universidad Nacional del Comahue, Quintral S/N, Barrio Jardín Botánico, 8400, San Carlos de Bariloche, Río Negro, Argentina
- Instituto de Investigaciones de Biodiversidad y Medio Ambiente (INIBOMA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Quintral 1250, 8400, San Carlos de Bariloche, Río Negro, Argentina
| | - Tamir Klein
- Institute of Soil, Water, and Environmental Sciences, Volcani Center, Agricultural Research Organization (ARO), PO Box 6, 50250, Beit Dagan, Israel
| | - Koen Kramer
- Alterra - Green World Research, Wageningen University, Droevendaalse steeg 1, 6700AA, Wageningen, The Netherlands
| | - Frederic Lens
- Naturalis Biodiversity Center, Leiden University, PO Box 9517, 2300RA, Leiden, The Netherlands
| | - Tom Levanic
- Department of Yield and Silviculture, Slovenian Forestry Institute, Večna pot 2, 1000, Ljubljana, Slovenia
| | - Juan C Linares Calderon
- Department of Physical, Chemical and Natural Systems, Pablo de Olavide University, Carretera de Utrera km 1, 41013, Seville, Spain
| | - Francisco Lloret
- CREAF, Campus UAB, 08193, Cerdanyola del Vallès, Spain
- Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain
| | - Raquel Lobo-Do-Vale
- Forest Research Centre, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017, Lisboa, Portugal
| | - Fabio Lombardi
- Department of Agricultural Science, Mediterranean University of Reggio Calabria, loc. Feo di Vito, 89060, Reggio Calabria, Italy
| | - Rosana López Rodríguez
- Forest Genetics and Physiology Research Group, Technical University of Madrid, Calle Ramiro de Maeztu 7, 28040, Madrid, Spain
- Hawkesbury Institute for the Environment, University of Western Sydney, Science Road, Richmond, NSW, 2753, Australia
| | - Harri Mäkinen
- Natural Resources Institute Finland (Luke), Viikinkaari 4, 00790, Helsinki, Finland
| | - Stefan Mayr
- Institute of Botany, University of Innsbruck, Sternwartestrasse 15, 6020, Innsbruck, Austria
| | - Ilona Mészáros
- Department of Botany, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary
| | - Juha M Metsaranta
- Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada, 5320-122nd Street, Edmonton, AB, T6H 3S5, Canada
| | - Francesco Minunno
- Department of Forest Sciences, University of Helsinki, P.O. Box 27 (Latokartanonkaari 7), 00014, Helsinki, Finland
| | - Walter Oberhuber
- Institute of Botany, University of Innsbruck, Sternwartestrasse 15, 6020, Innsbruck, Austria
| | - Andreas Papadopoulos
- Department of Forestry and Natural Environment Management, Technological Educational Institute (TEI) of Stereas Elladas, Ag Georgiou 1, 36100, Karpenissi, Greece
| | - Mikko Peltoniemi
- Natural Resources Institute Finland (Luke), PO Box 18 (Jokiniemenkuja 1), 01301, Vantaa, Finland
| | - Any M Petritan
- Swiss Federal Institute for Forest, Snow and Landscape Research - WSL, Zürcherstrasse 111, 8903, Birmensdorf, Switzerland
- National Institute for Research-Development in Forestry ''Marin Dracea'', Eroilor 128, 077190, Voluntari, Romania
| | - Brigitte Rohner
- Forest Ecology, Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zürich, Universitätstrasse 22, 8092, Zürich, Switzerland
- Swiss Federal Institute for Forest, Snow and Landscape Research - WSL, Zürcherstrasse 111, 8903, Birmensdorf, Switzerland
| | | | - Dimitrios Sarris
- Faculty of Pure and Applied Sciences, Open University of Cyprus, Latsia, 2252, Nicosia, Cyprus
- Department of Biological Sciences, University of Cyprus, PO Box 20537, 1678, Nicosia, Cyprus
- Division of Plant Biology, Department of Biology, University of Patras, 26500, Patras, Greece
| | - Jeremy M Smith
- Department of Geography, University of Colorado, Boulder, CO, 80309-0260, USA
| | - Amanda B Stan
- Department of Geography, Planning and Recreation, Northern Arizona University, PO Box 15016, Flagstaff, AZ, 86011, USA
| | - Frank Sterck
- Forest Ecology and Forest Management Group, Wageningen University, Droevendaalsesteeg 3a, 6708 PB, Wageningen, The Netherlands
| | - Dejan B Stojanović
- Institute of Lowland Forestry and Environment, University of Novi Sad, Antona Cehova 13, PO Box 117, 21000, Novi Sad, Serbia
| | - Maria L Suarez
- Instituto de Investigaciones de Biodiversidad y Medio Ambiente (INIBOMA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Quintral 1250, 8400, San Carlos de Bariloche, Río Negro, Argentina
| | - Miroslav Svoboda
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 961/129, 165 21, Praha 6-Suchdol, Czech Republic
| | - Roberto Tognetti
- Dipartimenti di Bioscienze e Territorio, Università del Molise, C. da Fonte Lappone, 86090, Pesche, Italy
- European Forest Institute (EFI) Project Centre on Mountain Forests (MOUNTFOR), Via E. Mach 1, 38010, San Michele all'Adige, Italy
| | - José M Torres-Ruiz
- Unité Mixte de Recherche (UMR) 1202 BIOGECO, Institut National de la Recherche Agronomique (INRA), Université de Bordeaux, 33615, Pessac, France
| | - Volodymyr Trotsiuk
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 961/129, 165 21, Praha 6-Suchdol, Czech Republic
| | - Ricardo Villalba
- Laboratorio de Dendrocronología e Historia Ambiental, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), CCT CONICET Mendoza, Av. Ruiz Leal s/n, Parque General San Martín, Mendoza, CP 5500, Argentina
| | - Floor Vodde
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, 51014, Tartu, Estonia
| | - Alana R Westwood
- Boreal Avian Modelling Project, Department of Renewable Resources, University of Alberta, 751 General Services Building, Edmonton, AB, T6G 2H1, Canada
| | - Peter H Wyckoff
- University of Minnesota, 600 East 4th Street, Morris, MN, 56267, USA
| | - Nikolay Zafirov
- University of Forestry, Kliment Ohridski Street 10, 1756, Sofia, Bulgaria
| | - Jordi Martínez-Vilalta
- CREAF, Campus UAB, 08193, Cerdanyola del Vallès, Spain
- Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain
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