| 研究论文 |
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| Simulation of Soil Moisture Content Dynamics in SPAC System of Irrigated Farmland in Inland Oasis, Northwest China |
| JI Xi-bin, KANG Er-si, ZHAO Wen-zhi, CHENG Ren-sheng, ZHANG Xiao-you, ZHANG Zhi-hui |
| Linze Inland River Basin Comprehensive Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000，China |
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Abstract Based on the principle and general momentum equilibrium equation of soil moisture, a realistic model of soil moisture movement in SPAC system is established in this paper. The model is validated with data for evaporation and evapotranspiration obtained in spring wheat field with irrigation in 2003 and 2004.The results show that the model is capable of simulating soil water dynamical movement. Meanwhile, the sensitivity analysis of the soil saturated conductivity Ks, drainage modulus Wmax, net radiation Rn, wind speed Uz, vapour pressure deficit D and leaf area index (LAI) to soil moisture content, from which the results show that the variation of these parameters dynamic impact dramatically on the dynamic of soil moisture movement. Furthermore, the model system has been used for simulating the water balance in field planted spring wheat under the condition of irrigation at fore-mountain oasis belts in drought area of northwest China, and water uptake by roots and soil moisture movement in SPAC system.
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Received: 15 April 2005
Published: 20 March 2006
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2006, Vol. 26 
