globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12164
论文题名:
Forest water use and water use efficiency at elevated CO2: A model-data intercomparison at two contrasting temperate forest FACE sites
作者: De Kauwe M.G.; Medlyn B.E.; Zaehle S.; Walker A.P.; Dietze M.C.; Hickler T.; Jain A.K.; Luo Y.; Parton W.J.; Prentice I.C.; Smith B.; Thornton P.E.; Wang S.; Wang Y.-P.; Wårlind D.; Weng E.; Crous K.Y.; Ellsworth D.S.; Hanson P.J.; Seok Kim H.; Warren J.M.; Oren R.; Norby R.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期:6
起始页码: 1759
结束页码: 1779
语种: 英语
英文关键词: Climate change ; CO2 fertilization ; Elevated CO2 ; FACE ; Models ; Plant physiology ; Stomatal conductance ; Water
Scopus关键词: carbon dioxide ; water ; carbon dioxide ; climate change ; climate effect ; ecosystem modeling ; ecosystem response ; fertilizer application ; forest ecosystem ; interception ; physiology ; plant ; stomatal conductance ; transpiration ; water use efficiency ; article ; comparative study ; theoretical model ; Carbon Dioxide ; Models, Theoretical ; Water
英文摘要: Predicted responses of transpiration to elevated atmospheric CO2 concentration (eCO2) are highly variable amongst process-based models. To better understand and constrain this variability amongst models, we conducted an intercomparison of 11 ecosystem models applied to data from two forest free-air CO2 enrichment (FACE) experiments at Duke University and Oak Ridge National Laboratory. We analysed model structures to identify the key underlying assumptions causing differences in model predictions of transpiration and canopy water use efficiency. We then compared the models against data to identify model assumptions that are incorrect or are large sources of uncertainty. We found that model-to-model and model-to-observations differences resulted from four key sets of assumptions, namely (i) the nature of the stomatal response to elevated CO2 (coupling between photosynthesis and stomata was supported by the data); (ii) the roles of the leaf and atmospheric boundary layer (models which assumed multiple conductance terms in series predicted more decoupled fluxes than observed at the broadleaf site); (iii) the treatment of canopy interception (large intermodel variability, 2-15%); and (iv) the impact of soil moisture stress (process uncertainty in how models limit carbon and water fluxes during moisture stress). Overall, model predictions of the CO2 effect on WUE were reasonable (intermodel μ = approximately 28% ± 10%) compared to the observations (μ = approximately 30% ± 13%) at the well-coupled coniferous site (Duke), but poor (intermodel μ = approximately 24% ± 6%; observations μ = approximately 38% ± 7%) at the broadleaf site (Oak Ridge). The study yields a framework for analysing and interpreting model predictions of transpiration responses to eCO2, and highlights key improvements to these types of models. © 2013 Blackwell Publishing Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62429
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作者单位: Department of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia; Biogeochemical Integration Department, Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, Jena 07745, Germany; Oak Ridge National Laboratory, Environmental Sciences Division, Climate Change Science Institute, Oak Ridge, TN, United States; Department of Earth and Environment, Boston University, Boston, MA 02215, United States; Biodiversity and Climate Research Centre (BiK-F), Senckenberg Gesellschaft für Naturforschung, Senckenberganlage 25, Frankfurt/Main 60325, Germany; Department of Physical Geography, Goethe-University, Altenhöferalle 1, Frankfurt/Main 60438, Germany; Department of Atmospheric Sciences, University of Illinois, 105 South Gregory Street, Urbana, IL 61801, United States; Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, United States; Natural Resource Ecology Laboratory, Colorado State University, CSU, Fort Collins, CO 80523-1499, United States; Department of Physical Geography and Ecosystem Science, Lund University, Ole Römers väg 3, Lund 223 63, Sweden; Canada Centre for Remote Sensing, Natural Resources Canada, 580 Booth St, Ottawa, ON K1A 0E4, Canada; CSIRO Marine and Atmospheric Research, Centre for Australian Weather and Climate Research, Private Bag #1, Aspendale, VIC 3195, Australia; Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia; Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University, San 56-1, Gwanak-gu, Seoul 151-742, South Korea; Division of Environmental Science and Policy, Nicholas School of the Environment, Duke University, West Campus, Durham, NC 27708, United States; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå SE-901 83, Sweden

Recommended Citation:
De Kauwe M.G.,Medlyn B.E.,Zaehle S.,et al. Forest water use and water use efficiency at elevated CO2: A model-data intercomparison at two contrasting temperate forest FACE sites[J]. Global Change Biology,2013-01-01,19(6)
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