Therefore, the method is a simple workable one for calculation of soil water diffusivity.
因此，三次样条函数法是计算土壤水分扩散率的一种简便可行的方法。
With the soil water characteristic curve, the expression of soil water diffusivity is also given in this paper.
并结合特征曲线方程，给出了土壤水分扩散率的表达式。
This paper discussed the unsaturated soil water diffusivity and its effect factors in waste water irrigation district in Beijing.
对北京市污灌区非饱和土壤水扩散率及其影响因素进行了研究。
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