蒸发条件下一维垂向非饱和土壤水分运动的数值模拟--以额济纳荒漠河岸胡杨林为例  

Numerical Simulation of Vertical Soil Water Movement in Unsaturated Soils during Evaporation:A Case Study of Desert Riparian Populus euphratica Forest in Ejin

作　　者：苏永红[1] 朱高峰[2] 冯起[1] 司建华[1] 常宗强[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,寒旱区流域水文及应用生态实验室,阿拉善荒漠生态-水文试验研究站,甘肃兰州730000 [2]兰州交通大学数理与软件工程学院,甘肃兰州730070

出　　处：《中国沙漠》2009年第2期236-240,共5页Journal of Desert Research

基　　金：国家自然科学基金项目(4070105440801001);国家社会科学基金(08XJY009);中国科学院西部行动计划项目(KZCX2-XB2-04-02)共同资助

摘　　要：根据额济纳荒漠河岸胡杨林的实际土壤层结构,建立了带有根系吸水项的垂向一维土壤水分非饱和运动基本方程,并采用有限差分法对蒸发条件下土壤水分运动方程进行离散化,编制了用于该模型数值模拟的计算程序。最后通过数值模拟对模型进行验证,结果表明,模拟值与实测值能够较好吻合,模拟精度在92%～98%之间,能较好地反映土壤水分的运动规律,为研究土壤-植被-大气连续体（SPAC）水分运移提供理论基础。A mathematical model with a volumetric sink term （represent the water uptake by plant roots） is established to simulate the vertical one-dimensional soil water flow process in unsaturated zone based on the Richards＇ equation of soil water movement and according to the actual layer structure of desert riparian Populus euphratica forest in Ejin, Inner Mongolia. The finite difference method was used to discrete the soil water movement equation with evaporation boundary conditions, and the procedure for the numerical simulation of the model was programmed. The results showed that the simulation values were consistent well with the measurements with a precision ranging between 92% and 98%. This work supplies a theoretical basis for the study of water movement in the soil-plant-atmosphere continuum （SPAC）.

关 键 词：额济纳 土壤 水分运动 数值模型 

分 类 号：S152.7[农业科学—土壤学]