Pedosphere 23(5): 620--635, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Numerical simulation of soil water dynamics in a drip irrigated cotton field under plastic mulch
LIU Mei-Xian1,2, YANG Jing-Song1, LI Xiao-Ming1, YU Mei3 and WANG Jin4
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125 (China)
3Water Conservancy Bureau of Yuhuatai, Nanjing 210012 (China)
4Wulanwusu 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.
Key Words:  arid area, drip irrigation, evapotranspiration, Hydrus-2D model, root zone
Citation: Liu, M. X., Yang, J. S., Li, X. M., Yu, M. and Wang, J. 2013. Numerical simulation of soil water dynamics in a drip irrigated cotton field under plastic mulch. Pedosphere. 23(5): 620-635.
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