Estimating daily actual evapotranspiration of a rice–wheat rotation system in typical farmland in the Huai River Basin using a two-step model and two one-step models  

作　　者：LI Meng CHU Rong-hao Abu Reza Md.Towfiqul ISLAM JIANG Yue-lin SHEN Shuang-he 

机构地区：[1]School of Resources and Environment,Anhui Agricultural University,Hefei 230036,P.R.China [2]Hefei Scientific Observing and Experimental Station of Agro-Environment,Ministry of Agriculture and Rural Affairs,P.R.China [3]Anhui Public Meteorological Service Center,Anhui Meteorological Bureau,Hefei 230031,P.R.China [4]Department of Disaster Management,Begum Rokeya University,Rangpur 5400,Bangladesh [5]Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)ZJoint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CICFEMD)/Jiangsu Key Laboratory of Agricultural Meteorology,College of Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,P.R.China

出　　处：《Journal of Integrative Agriculture》2021年第1期274-288,共15页农业科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (41905100);the Anhui Provincial Natural Science Foundation, China (1908085QD171);the Anhui Agricultural University Science Foundation for Young Scholars, China (2018zd07);the Anhui Agricultural University Introduction and Stabilization of Talent Fund, China (yj2018-57);the National Key Research and Development Program of China (2018YFD0300905);the Postgraduate Research and Practice Innovation Program of Jiangsu Province, China (KYCX17_0885)。

摘　　要：The objective of this study is to evaluate the performance of three models for estimating daily evapotranspiration(ET) by employing flux observation data from three years(2007, 2008 and 2009) during the growing seasons of winter wheat and rice crops cultivated in a farmland ecosystem(Shouxian County) located in the Huai River Basin(HRB), China. The first model is a two-step model(PM-Kc);the other two are one-step models(e.g., Rana-Katerji(R-K) and advection-aridity(AA)). The results showed that the energy closure degrees of eddy covariance(EC) data during winter wheat and rice-growing seasons were reasonable in the HRB, with values ranging from 0.84 to 0.91 and R2 of approximately 0.80. Daily ET of winter wheat showed a slow decreasing trend followed by a rapid increase, while that of rice presented a decreasing trend after an increase. After calibrating the crop coefficient(Kc), the PM–Kc model performed better than the model using the Kc recommended by the Food and Agricultural Organization(FAO). The calibrated key parameters of the R-K model and AA model showed better universality. After calibration, the simulation performance of the PM-Kc model was satisfactory. Both the R-K model and AA model underestimated the daily ET of winter wheat and rice. Compared with that of the R-K model, the simulation result of the AA model was better, especially in the simulation of daily ET of rice. Overall, this research highlighted the consistency of the PM-Kc model to estimate the water demand for rice and wheat crops in the HRB and in similar climatic regions in the world.

关 键 词：daily evapotranspiration crop coefficient crop water demand rice–wheat rotation system Huai River Basin 

分 类 号：S181[农业科学—农业基础科学]