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《Transactions of The Chinese Society of Agricultural Engineering》 2003-02
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Accuracy and stability of the inverse method to estimate the average root-water-uptake rate and its application

Zuo Qiang, Wang Dong, Luo Changshou(College of Resources and Environment, and Key Laboratory of Plant Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100094, China)  
The accuracy and convergence of the inverse method to estimate the average root water uptake rate, which was proposed by Zuo, et al.(2001), are mainly dependent on the following two factors: the time interval (T) between the two successive measurements of soil water content distributions, and the spatial interval (SI) of the measured data along the soil profile. Examples of the numerical experiment were taken to examine the effect of different T and SI on the accuracy and stability of the method in this paper. In practice, it is recommended to choose 5 d≤T15 d and SI20 cm so as to keep the maximal absolute error and the overall relative error between the estimated and the real average root water uptake rate within 0.0015 d -1 and 15%, respectively. Furthermore, the inverse method was applied to simulate the average root water uptake rate distributions of winter wheat at seedling stage under water stress. Winter wheat was planted in the soil columns and the experiment was conducted in a greenhouse with 2 water stress levels. The simulated results showed that water stress reduced root water uptake of winter wheat remarkably and probably inhibited the roots growth as well. The scope of winter wheat root water uptake was adjusted by itself to the lower soil layer where soil moisture was appropriate when soil water supply in the upper soil layer was deficient.
【Fund】: 国家重点基础研究发展规划项目 (G1 9990 1 1 70 9) ;; 国家高 技术研究发展计划 (863计划 ) (2 0 0 1 AA2 4 2 0 31 ) ;; 霍英东高等院校青 年教师基金项目
【CateGory Index】: S311
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