文献类型：会议论文

英文题名：Evaluating the effects of future climate change and elevated CO2 on the water use efficiency in terrestrial ecosystems of China

作者：Zhu, Qiuan[1,2] Jiang, Hong[1,3] Peng, Changhui[2] Liu, Jinxun[4] Wei, Xiaohua[5] Fang, Xiuqin[6] Liu, Shirong[7] Zhou, Guomo[3] Yu, Shuquan[3]

第一作者：Zhu, Qiuan

通信作者：Jiang, H[1]

机构：[1]Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210093, Peoples R China;[2]Univ Quebec, Inst Environm Sci, Montreal, PQ H3C 3P8, Canada;[3]Zhejiang Forestry Univ, Int Res Ctr Spatial Ecol, Linan 311300, Peoples R China;[4]SGT Inc, EROS Ctr, Sioux Falls, SD 57198 USA;[5]Univ British Columbia Okanagan, Dept Earth & Environm Sci, Kelowna, BC V1V 1V7, Canada;[6]Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Peoples R China;[7]Chinese Acad Forestry, Inst Forest Ecol & Environm, Beijing 100091, Peoples R China

会议论文集：Conference of the International-Society-for-Ecological-Modelling

会议日期：OCT 06-09, 2009

会议地点：Quebec City, CANADA

语种：英文

外文关键词：Water use efficiency; WUE; Climate change; Ecosystem level; IBIS; DGVM; China

年份：2011

摘要：Water use efficiency (WUE) is an important variable used in climate change and hydrological studies in relation to how it links ecosystem carbon cycles and hydrological cycles together. However, obtaining reliable WUE results based on site-level flux data remains a great challenge when scaling up to larger regional zones. Biophysical, process-based ecosystem models are powerful tools to study VVUE at large spatial and temporal scales. The Integrated Biosphere Simulator (IBIS) was used to evaluate the effects of climate change and elevated CO2 concentrations on ecosystem-level VVUE (defined as the ratio of gross primary production (GPP) to evapotranspiration (ET)) in relation to terrestrial ecosystems in China for 2009-2099. Climate scenario data (IPCC SRES A2 and SRES B1) generated from the Third Generation Coupled Global Climate Model (CGCM3) was used in the simulations. Seven simulations were implemented according to the assemblage of different elevated CO2 concentrations scenarios and different climate change scenarios. Analysis suggests that (1) further elevated CO2 concentrations will significantly enhance the WUE over China by the end of the twenty-first century, especially in forest areas; (2) effects of climate change on WUE will vary for different geographical regions in China with negative effects occurring primarily in southern regions and positive effects occurring primarily in high latitude and altitude regions (Tibetan Plateau); (3) WUE will maintain the current levels for 2009-2099 under the constant climate scenario (i.e. using mean climate condition of 1951-2006 and CO2 concentrations of the 2008 level); and (4) WUE will decrease with the increase of water resource restriction (expressed as evaporation ratio) among different ecosystems. (C) 2010 Elsevier B.V. All rights reserved.