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

摘要/Abstract

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。

关键词: 额济纳, 土壤, 水分运动, 数值模型

Abstract: 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).

Key words: Ejin, soil water movement, numerical model

中图分类号:

S152.7

苏永红;朱高峰;冯起;司建华;常宗强. 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[J]. 中国沙漠, 2009, 29(2): 236-240.

SU Yong-hong;ZHU Gao-feng;FENG Qi;SI Jina-hua;CHANG Zong-qiang. Numerical Simulation of Vertical Soil Water Movement in Unsaturated Soils during Evaporation: A Case Study of Desert Riparian Populus euphratica Forest in Ejin[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(2): 236-240.

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