旱地农田土壤水分动态平衡的模拟

从农田土壤水分平衡方程出发，综合考虑了农田水分的主要收支项，特别是对水分渗漏量估算进行了必要的改进，建立了旱地农田土壤水分的动态模型。运用地处半干旱气候区的甘肃天水和陕西经阳气象站气象资料和非灌溉作物地土壤水分观测资料摸拟了农田土壤水分的逐旬变化，其结果比较理想地描述了实际农田土壤水分变化规律。

MODELLING STUDY OF SOIL WATER BALANCE IN RAINFED FIELDS

Starting from the soil water balance equation for rainfed fields,a dynamic model isconstructed for arid-land soil water regime with the chief budget terms considered in a compre-hensive fashion and necessary improvement done on the percolation estimate. For the waterchange on a decade basis,simulation has been undertaken in terms of the data from non-irrigatedland measured by Tianstui Weather Station,Ganshu and Jingyang Station,Shanxi,both located insemi-arid climate. Restilts show that the modelling has yielded good outcome that best describesthe soil water change in these regions.