A Physicoempirical Model for Soil Water Simulation in Crop Root Zone  

作　　者：SHANG Song-Hao MAO Xiao-Min 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084 (China) [2]Center for Agricultural Water Research in China, College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083 (China)

出　　处：《Pedosphere》2011年第4期512-521,共10页土壤圈（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Nos. 50879041 and 50939004);the Program for New Century Excellent Talents in University of the Ministry of Education of China (Nos. 06-0059 and 07-0814)

摘　　要：To predict soil water variation in the crop root zone, a general exponential recession （GER） model was developed to depict the recession process of soil water storage. Incorporating the GER model into the mass balance model for soil water, a GER-based physicoempirical （PE-GER） model was proposed for simulating soil water variation in the crop root zone. The PE-GER model was calibrated and validated with experimental data of winter wheat in North China. Simulation results agreed well with the field experiment results, as well as were consistent with the simulation results from a more thoroughly developed soil water balance model which required more detailed parameters and inputs. Compared with a previously developed simple exponential recession （SER） based physicoempirical （PF^SER） model, PE-GER was more suitable f0r application in a broad range of soil texture, from light soil to heavy soil. Practical application of PE-GER showed that PE-GER could provide a convenient way to simulate and predict the variation of soil water storage in the crop root zone, especially in case of insufficient data for conceptual or hydrodynamic models.To predict soil water variation in the crop root zone,a general exponential recession (GER) model was developed to depict the recession process of soil water storage.Incorporating the GER model into the mass balance model for soil water,a GER-based physicoempirical (PE-GER) model was proposed for simulating soil water variation in the crop root zone.The PE-GER model was calibrated and validated with experimental data of winter wheat in North China.Simulation results agreed well with the field experiment results,as well as were consistent with the simulation results from a more thoroughly developed soil water balance model which required more detailed parameters and inputs.Compared with a previously developed simple exponential recession (SER) based physicoempirical (PE-SER) model,PE-GER was more suitable for application in a broad range of soil texture,from light soil to heavy soil.Practical application of PE-GER showed that PE-GER could provide a convenient way to simulate and predict the variation of soil water storage in the crop root zone,especially in case of insufficient data for conceptual or hydrodynamic models.

关 键 词：general exponential recession model irrigation scheduling recession process soil texture 

分 类 号：S152.72[农业科学—土壤学] TG444[农业科学—农业基础科学]