Measuring and modeling evapotranspiration of a Populus euphratica forest in northwestern China  

作　　者：Guanlong Gao Qi Feng Xiande Liu Yonghua Zhao 

机构地区：[1]College of Environment and Resource,Shanxi University,Taiyuan 030006,People’s Republic of China [2]Shaanxi Key Laboratory of Land Consolidation,Chang’an University,Xi’an 710064,People’s Republic of China [3]Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,People’s Republic of China [4]Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Zhangye 734000,People’s Republic of China

出　　处：《Journal of Forestry Research》2021年第5期1963-1977,共15页林业研究（英文版）

基　　金：supported financially by the Shanxi Province Science Foundation for Youth(201801D221286);the Chinese Post-doctoral Science Foundation(2018M643769);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2020L0028);the Fundamental Research Funds for the Central Universities CHD(300102279505);the Shaanxi Key Laboratory of Land Consolidation(2018–JC13)。

摘　　要：Vegetation is sparsely distributed in the arid regions of northwestern China,and accurately measuring and partitioning of evapotranspiration is of importance for ecosystems in such areas.In this study,we measured and analyzed diurnal and phenological variations in evapotranspiration using the eddy-covariance method based on the Penman-Monteith,Priestley-Taylor,Shuttleworth-Wallace models,a newly proposed improved dual source model and a clumped model in a forest reserve in the Ejin oasis of Populus euphratica in 2015 and 2016 growing seasons.A sensitivity analysis was performed for the models with higher accuracies and we examined the biotic and abiotic controls on evapotranspiration.The results show that the total amounts of evapotranspiration during the two growing seasons in 2015 and 2016 were 622 and 612 mm,respectively.Phenological variations in evapotranspiration produced single-peak curves,while diurnal variations reflected the influence of high temperatures on some afternoons.The Priestley-Taylor and the improved dual source models gave the most accurate evapotranspiration values at the daily scale and appeared to be most suitable for the estimation of evapotranspiration for the species in arid regions.In addition,both models were the most sensitive to net radiation(Rn).

关 键 词：EVAPOTRANSPIRATION EDDY-COVARIANCE Populus euphratica Northwestern China 

分 类 号：S718.5[农业科学—林学]