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

作者机构：School of Resources and EnvironmentAnhui Agricultural UniversityHefei 230036P.R.China Hefei Scientific Observing and Experimental Station of Agro-EnvironmentMinistry of Agriculture and Rural AffairsP.R.China Anhui Public Meteorological Service CenterAnhui Meteorological BureauHefei 230031P.R.China Department of Disaster ManagementBegum Rokeya UniversityRangpur 5400Bangladesh Key Laboratory of Meteorological DisasterMinistry 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 MeteorologyCollege of Applied MeteorologyNanjing University of Information Science&TechnologyNanjing 210044P.R.China 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2021年第20卷第1期

页      面：274-288页

核心收录：

学科分类：0710[理学-生物学] 0832[工学-食品科学与工程（可授工学、农学学位）] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 07[理学] 0905[农学-畜牧学] 0906[农学-兽医学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 0713[理学-生态学] 

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) 

主　　题：daily evapotranspiration crop coefficient crop water demand rice–wheat rotation system Huai River Basin 

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.