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《Journal of Glaciolgy and Geocryology》 2001-03
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A Mathematical Model Predicting Water Content in Desert Soil with Plant Growth

ZHU Yong-hua 1 , WU Yan-qing 1 , L Hai-shen 2 , PU Jin-chun 1 (1. Cold and Arid Region Environmental and Engineering Research Institute, CAS, Gansu Lanzhou 730000, China; 2. Department of Mathematics, Lanzhou University, Gansu Lan  
In the soil-plant-atmosphere continuum (SPAC), water transfer is an important process. How to describe water transfer in the SPAC is a key to know and understand the SPAC. But the key to describe water transfer in quantity is to determine how plant roots absorb soil water and to predict how soil moisture content changes in profile. Luotuoci is a typical kind of subshrub in inland desert regions of China and its lateral roots are very rich. A concept of plant root growth radius is developed in order to precisely describe the subshrub with rich lateral roots. The authors also studied the root distribution pattern of three-year-old Luotuoci and its volumetric soil water content in profile, and analyzed the relations between root water uptake and its restricted factors. Equation (5) for Lutuoci root water uptake is set up by multivariate regression analysis. Equations for calculation of evapotranspiration at time t (\%ET\%), change of roots growth radius (\%R\-h\%) and root depth at a given time (\%\%) are also worked out. At last, the authors simulated the soil water dynamics in the experimented Luotuoci growth site by the established root water uptake model. The comparison between the simulated and measured values shows that the accuracy of the established model is approving and realistic, and the method to establish the model of Luotuoci root water uptake can be useful to other kind of subshrub in inland desert regions.
【Fund】: 中国科学院知识创新工程重大项目(KZCX1-10 -0 3) ;; 中国科学院寒区旱区环境与工程研究所知识创新工程项目 (CACX2 10 0 2 1) ;; 国家自然科学基金重点项目 ( 497310 30 ) ;; 国家 \九五”重点科技攻关项目 ( 96-912 -0 3-0 3S)资助
【CateGory Index】: S152.7
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