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。
The concentration of ammonium nitrogen in horizontal migration decreased with the increase in unsaturated soil water diffusivity in power function.
铵态氮水平运移的浓度受非饱和土壤水扩散率的影响，并随非饱和土壤水扩散率的升高而呈幂函数曲线下降。
Unsaturated soil water diffusivity is a necessarily basal parameter to study soil water movement laws and quantificationally analyze soil water movement with method of mathematical simulation.
非饱和土壤水分扩散率是研究土壤水分运动规律必不可少的基本参数之一。
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。
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。
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