文献类型：期刊文献

英文题名：Ecosystem water use efficiency in a warm-temperate mixed plantation in the North China

作者：Tong, Xiaojuan[1] Zhang, Jinsong[2] Meng, Ping[2] Li, Jun[3] Zheng, Ning[2]

第一作者：Tong, Xiaojuan

通信作者：Tong, XJ[1]|[a00054f722f48ec14379a]同小娟;

机构：[1]Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat State Forestry A, Beijing 100091, Peoples R China;[3]Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China

年份：2014

卷号：512

起止页码：221-228

外文期刊名：JOURNAL OF HYDROLOGY

收录：;EI(收录号：20141317513191);Scopus(收录号：2-s2.0-84896496780);WOS:【SCI-EXPANDED(收录号:WOS:000335706900017)】；

基金：This study was sponsored by the National Natural Science Foundation of China (31100322), Special Public Sector Research (GYHY20110400904), and the Fundamental Research Funds for the Central Universities (Nos. YX2011-19; TD2011-07).

语种：英文

外文关键词：Mixed plantation; Gross primary productivity; Evapotranspiration; Water use efficiency; Eddy covariance

摘要：Water use efficiency (WUE) at the ecosystem level is an important ecophysiological index reflecting the coupling relationship between water and carbon cycles. CO2 and water vapor fluxes were measured by the eddy covariance method during the period 2006-2010 over a warm-temperate mixed plantation in the North China. The seasonal and interannual variations of gross primary productivity (GPP), evapotranspiration (ET) and ecosystem WUE were analyzed, and the impacts of climatic variables and soil moisture on GPP, ET and WUE were discussed. At the monthly scale, GPP and ET had similar relations with solar radiation, air temperature, vapor pressure deficit (VPD) and precipitation. It is suggested that photosynthesis and evapotranspiration were driven by climatic variables at the approximately equal strength. During the growing season, VVUE decreased significantly with the increase of VPD and solar radiation. Cloudiness can improve photosynthesis and enhance VVUE. GPP was 9-39% greater but ET was 8-26% lower under cloudy sky conditions than that under sunny sky conditions. Therefore, WUE was 29-72% higher under cloudy skies in comparison with that under sunny skies. Annual average VVUE ranged from 1.76 to 2.41 g C kg(-1) H2O. The major driver of interannual variability in WUE was soil water content in May. (c) 2014 Published by Elsevier B.V.