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| 地膜覆盖滴灌棉田土壤上水分动态的数值模拟 | |
| 作者姓名： | LIU Mei-Xian YANG Jing-Song LI Xiao-Ming YU Mei WANG Jin |
| 作者单位： | State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science, Chinese Academy of Sciences;Institute of Subtropical Agriculture Chinese Academy of Sciences;Water Conservancy Bureau of Yuhuatai;Wulanwusu Agro-Meteorological Experiment Station |
| 基金项目： | the Special Fund of Industrial (Agriculture) Research for Public Welfare of China，the Special Fund of Industrial (Marine) Research for Public Welfare of China，the Jiangsu Provincial Science and Technology Support Program;China，the Knowledge Innovation Program of the Chinese Academy of Sciences，the National Natural Science Foundation of China |
| 摘 要： | Drip irrigation under plastic mulch has been widely applied in arid Northwest China as a water-saving irrigation technology.A comprehensive knowledge of the distribution and movement of soil water in root zone is essential for the design and management of irrigation regimes.Simulation models have been proved to be efcient methods for this purpose.In this study,the numerical model Hydrus -2D was used to simulate the temporal variations of soil water content in a drip irrigated cotton field under mulching.A concept of partitioning coefcient,calibrated to be 0.07,was introduced to describe the efect of plastic mulch on prevention of evaporation.The soil hydraulic parameters were optimized by inverse solution using the field data.At the optimized conditions,the model was used to predict soil water content for four field treatments.The agreements between the predictions and observations were evaluated using coefcient of determination (R2) and root mean square error (RMSE).The results suggested that the model fairly reproduced the variations in soil water content at all locations in four treatments,with R2 ranging from 0.582 to 0.826 and RMSE from 0.029 to 0.050 cm3 cm-3,indicating that the simulations agreed well with the observations. |
| 关 键 词： | arid area drip irrigation evapotranspiration Hydrus-2D model root zone |
| 收稿时间： | 30 November 2012 |
Numerical simulation of soil water dynamics in a drip irrigated cotton field under plastic mulch |
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| LIU Mei-Xian,YANG Jing-Song,LI Xiao-Ming,YU Mei,WANG Jin.Numerical simulation of soil water dynamics in a drip irrigated cotton field under plastic mulch[J].Pedosphere,2013,23(5):620-635. | |
| Authors: | LIU Mei-Xian YANG Jing-Song LI Xiao-Ming YU Mei and WANG Jin |
| Institution: | 1. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125(China) 2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China) 3. Water Conservancy Bureau of Yuhuatai, Nanjing 210012(China) 4. Wulanwusu Agro-Meteorological Experiment Station, Shihezi 832021(China) |
| Abstract: | Drip irrigation under plastic mulch has been widely applied in arid Northwest China as a water-saving irrigation technology. A comprehensive knowledge of the distribution and movement of soil water in root zone is essential for the design and management of irrigation regimes. Simulation models have been proved to be efficient methods for this purpose. In this study, the numerical model Hydrus-2D was used to simulate the temporal variations of soil water content in a drip irrigated cotton field under mulching. A concept of partitioning coefficient, calibrated to be 0.07, was introduced to describe the effect of plastic mulch on prevention of evaporation. The soil hydraulic parameters were optimized by inverse solution using the field data. At the optimized conditions, the model was used to predict soil water content for four field treatments. The agreements between the predictions and observations were evaluated using coefficient of determination (R2) and root mean square error (RMSE). The results suggested that the model fairly reproduced the variations in soil water content at all locations in four treatments, with R2 ranging from 0.582 to 0.826 and RMSE from 0.029 to 0.050 cm3 cm-3, indicating that the simulations agreed well with the observations. |
| Keywords: | arid area drip irrigation evapotranspiration Hydrus-2D model root zone |
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