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.
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。
Therefore, the method is a simple workable one for calculation of soil water diffusivity.
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。
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.
土壤容重、孔隙大小、孔隙类型及土壤颗粒组成中粘粒含量对土壤水分扩散率都有一定的影响。
Then, the bulk density, porosity, the type of pore and clay content in the soil affected the soil moisture diffusivity.
因热扩散、含水率梯度引起的水分迁移可以忽略不计。
Moisture transfer caused by heat diffusion and a moisture content gradient could be neglected.
在微波真空干燥过程中，就整个板材而言，热扩散效应对木材中水分迁移的影响不大，但在局部的有限范围内，它对自动平衡木材内含水率具有显著的作用。
During the drying process of MV, for the whole board, the effect of thermal diffusion on moisture movement is not significant, but it can cause a leveling of moisture profile in a local range of wood.
当含水率低于纤维饱和点时 ，水分扩散系数随含水率的下降而减少。
P. ), the moisture diffusion coefficients of Maasson pine timber are increasing with moisture content decreasing; when moisture content below F. S. P.
当含水率低于纤维饱和点时 ，水分扩散系数随含水率的下降而减少。
P. ), the moisture diffusion coefficients of Maasson pine timber are increasing with moisture content decreasing; when moisture content below F. S. P.
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