DOI: 10.1111/gcb.12873
论文题名: Change in terrestrial ecosystem water-use efficiency over the last three decades
作者: Huang M. ; Piao S. ; Sun Y. ; Ciais P. ; Cheng L. ; Mao J. ; Poulter B. ; Shi X. ; Zeng Z. ; Wang Y.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 6 起始页码: 2366
结束页码: 2378
语种: 英语
英文关键词: Climate change
; CO2 enrichment
; Nitrogen deposition
; Process-based model
; Remote-sensing
; Water-use efficiency
Scopus关键词: carbon cycle
; carbon dioxide
; climate change
; global change
; nitrogen
; physiological response
; remote sensing
; terrestrial ecosystem
; water use efficiency
; Amazonia
; Eastern Europe
; North America
; Siberia
; carbon dioxide
; nitrogen
; water
; carbon cycle
; climate change
; ecosystem
; evapotranspiration
; metabolism
; photosynthesis
; plant
; theoretical model
; Carbon Cycle
; Carbon Dioxide
; Climate Change
; Ecosystem
; Models, Theoretical
; Nitrogen
; Photosynthesis
; Plant Transpiration
; Plants
; Water
英文摘要: Defined as the ratio between gross primary productivity (GPP) and evapotranspiration (ET), ecosystem-scale water-use efficiency (EWUE) is an indicator of the adjustment of vegetation photosynthesis to water loss. The processes controlling EWUE are complex and reflect both a slow evolution of plants and plant communities as well as fast adjustments of ecosystem functioning to changes of limiting resources. In this study, we investigated EWUE trends from 1982 to 2008 using data-driven models derived from satellite observations and process-oriented carbon cycle models. Our findings suggest positive EWUE trends of 0.0056, 0.0007 and 0.0001 g C m-2 mm-1 yr-1 under the single effect of rising CO2 ('CO2 '), climate change ('CLIM') and nitrogen deposition ('NDEP'), respectively. Global patterns of EWUE trends under different scenarios suggest that (i) EWUE-CO2 shows global increases, (ii) EWUE-CLIM increases in mainly high latitudes and decreases at middle and low latitudes, (iii) EWUE-NDEP displays slight increasing trends except in west Siberia, eastern Europe, parts of North America and central Amazonia. The data-driven MTE model, however, shows a slight decline of EWUE during the same period (-0.0005 g C m-2 mm-1 yr-1), which differs from process-model (0.0064 g C m-2 mm-1 yr-1) simulations with all drivers taken into account. We attribute this discrepancy to the fact that the nonmodeled physiological effects of elevated CO2 reducing stomatal conductance and transpiration (TR) in the MTE model. Partial correlation analysis between EWUE and climate drivers shows similar responses to climatic variables with the data-driven model and the process-oriented models across different ecosystems. Change in water-use efficiency defined from transpiration-based WUEt (GPP/TR) and inherent water-use efficiency (IWUEt , GPP×VPD/TR) in response to rising CO2 , climate change, and nitrogen deposition are also discussed. Our analyses will facilitate mechanistic understanding of the carbon-water interactions over terrestrial ecosystems under global change. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61714
Appears in Collections: 影响、适应和脆弱性
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作者单位: Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China; Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Center for Excellence in Tibetan Earth Science, Chinese Academy of Sciences, Beijing, China; LSCE, UMR CEA-CNRS, Bat. 709, CE, L'Orme des Merisiers, Gif-sur-Yvette, France; CSIRO Land and Water Flagship, GPO Box 1666, Canberra, ACT, Australia; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN, United States; Institute on Ecosystems and the Department of Ecology, Montana State University, Bozeman, MT, United States; CSIRO Ocean and Atmosphere Flagship, PMB 1, Aspendale, VIC, Australia
Recommended Citation:
Huang M.,Piao S.,Sun Y.,et al. Change in terrestrial ecosystem water-use efficiency over the last three decades[J]. Global Change Biology,2015-01-01,21(6)