Evapotranspiration partitioning using an optimality-based ecohydrological model in a semiarid shrubland  

作　　者：Lajiao Chen Liying Sun Weijiang Liu Lizhe Wang Hui Wu A-Xing Zhu Yiqi Luo 

机构地区：[1]Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing,People’s Republic of China [2]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,People’s Republic of China [3]Chinese Academy For Environmental Planning,Beijing,People’s Republic of China [4]Computer Science and Geological Survey of CUG,China University of Geosciences,Wuhan,People’s Republic of China [5]Smart City Research Center,Hangzhou Dianzi University,Hangzhou,People’s Republic of China [6]Smart City Research Center of Zhejiang Province,Hangzhou,People’s Republic of China [7]Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,School of Geography,Nanjing Normal University,Nanjing,People’s Republic of China [8]Department of Geography,University of Wisconsin–Madison,Madison,WI,USA [9]Center for Ecosystem Science and Society,Northern Arizona University,Flagstaff,AZ,USA

出　　处：《International Journal of Digital Earth》2019年第12期1423-1440,共18页国际数字地球学报（英文）

基　　金：This work is supported by the National Key Research and Development Program of China[grant number 2017YFC050540503];National Natural Science Foundation of China[grant numbers 41301028,41571413,41701520 and 41471368];Lajiao Chen(201704910065)would like to acknowledge the fellowship from the China Scholarship Council(CSC).

摘　　要：Partitioning of evapotranspiration(ET)into biological component transpiration(T)and non-biological component evaporation(E)is crucial in understanding the impact of environmental change on ecosystems and water resources.However,direct measurement of transpiration is still challenging.In this paper,an optimality-based ecohydrological model named Vegetation Optimality Model(VOM)is applied for ET partitioning.The results show that VOM model can reasonably simulate ET and ET components in a semiarid shrubland.Overall,the ratio of transpiration to evapotranspiration is 49%for the whole period.Evaporation and plant transpiration mainly occur in monsoon following the precipitation events.Evaporation responds immediately to precipitation events,while transpiration shows a lagged response of several days to those events.Different years demonstrate different patterns of T/ET ratio dynamic in monsoon.Some of the years show a low T/ET ratio at the beginning of monsoon and slowly increased T/ET ratio.Other years show a high level of T/ET ratio for the whole monsoon.We find out that spring precipitation,especially the size of the precipitation,has a significant influence on the T/ET ratio in monsoon.

关 键 词：ET partitioning optimalitybased ecohydrological model VOM semiarid shrubland 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]