DOI: 10.1111/gcb.13180
论文题名: Seasonal responses of terrestrial ecosystem water-use efficiency to climate change
作者: Huang M. ; Piao S. ; Zeng Z. ; Peng S. ; Ciais P. ; Cheng L. ; Mao J. ; Poulter B. ; Shi X. ; Yao Y. ; Yang H. ; Wang Y.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 6 起始页码: 2165
结束页码: 2177
语种: 英语
英文关键词: Climate change
; CO2 enrichment
; Process-based model
; Seasonal variation
; Terrestrial ecosystem
; Water-use efficiency
Scopus关键词: carbon dioxide
; climate change
; climate effect
; evapotranspiration
; seasonal variation
; terrestrial ecosystem
; water use efficiency
; carbon
; carbon dioxide
; nitrogen
; water
; carbon cycle
; climate change
; ecosystem
; evapotranspiration
; season
; theoretical model
; water cycle
; Carbon
; Carbon Cycle
; Carbon Dioxide
; Climate Change
; Ecosystem
; Models, Theoretical
; Nitrogen
; Plant Transpiration
; Seasons
; Water
; Water Cycle
英文摘要: Ecosystem water-use efficiency (EWUE) is an indicator of carbon-water interactions and is defined as the ratio of carbon assimilation (GPP) to evapotranspiration (ET). Previous research suggests an increasing long-term trend in annual EWUE over many regions and is largely attributed to the physiological effects of rising CO2. The seasonal trends in EWUE, however, have not yet been analyzed. In this study, we investigate seasonal EWUE trends and responses to various drivers during 1982-2008. The seasonal cycle for two variants of EWUE, water-use efficiency (WUE, GPP/ET), and transpiration-based WUE (WUEt, the ratio of GPP and transpiration), is analyzed from 0.5° gridded fields from four process-based models and satellite-based products, as well as a network of 63 local flux tower observations. WUE derived from flux tower observations shows moderate seasonal variation for most latitude bands, which is in agreement with satellite-based products. In contrast, the seasonal EWUE trends are not well captured by the same satellite-based products. Trend analysis, based on process-model factorial simulations separating effects of climate, CO2, and nitrogen deposition (NDEP), further suggests that the seasonal EWUE trends are mainly associated with seasonal trends of climate, whereas CO2 and NDEP do not show obvious seasonal difference in EWUE trends. About 66% grid cells show positive annual WUE trends, mainly over mid- and high northern latitudes. In these regions, spring climate change has amplified the effect of CO2 in increasing WUE by more than 0.005 gC m-2 mm-1 yr-1 for 41% pixels. Multiple regression analysis further shows that the increase in springtime WUE in the northern hemisphere is the result of GPP increasing faster than ET because of the higher temperature sensitivity of GPP relative to ET. The partitioning of annual EWUE to seasonal components provides new insight into the relative sensitivities of GPP and ET to climate, CO2, and NDEP. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61375
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China; Institute of Tibetan Plateau Research, 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.,Zeng Z.,et al. Seasonal responses of terrestrial ecosystem water-use efficiency to climate change[J]. Global Change Biology,2016-01-01,22(6)