本文依据4年大田试验所取得的土壤水分资料,经过多次运算认为:不同植被条件下土壤水分的剖面动态,可用二次曲线进行拟合,求一种植被条件下,7—10月两条曲线的有效交点,可得该植被土壤水分的补偿深度,利用积分方法,可求得各种植被从7—10月份的相对耗水量及从10月至翌年4月的水分蒸发量,3—11月份各种植被的土壤水分含量的动态,符合我们提出的如下数字模型: y=Aexp {rt-B[1-exp(-ct)]} Based on the soil moisture data obtained from the 4-year field experiment, after several computations, the profile of soil moisture under different vegetation conditions can be fitted by the quadratic curve. Curve of the effective point of intersection to obtain the depth of compensation of soil moisture of the vegetation, the use of integral method can be obtained from various vegetation types from July to October relative water consumption and from October to April next year, the amount of water evaporation, 3-11 The dynamics of soil moisture content of various vegetation types in the month are in accordance with our proposed numerical model as follows: y = Aexp {rt-B [1-exp (-ct)]}