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中文摘要：
采用三次样条函数计算土壤含水量分布，用土壤含水量分布计算土壤水分扩散率，并将其与Bruce和Klute方法的结果进行比较，结果表明：除了土壤含水量在接近饱和时计算结果偏差较大外，采用三次样条函数得出的土壤水分扩散率与经典的Bruce和Klute方法结果接近。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。
英文摘要：
Cubic spline function was used to assess soil water distribution, and then further to calculate soil water diffusivity. From the experiments, it was found that the soil water diffusivity estimated with the method mentioned above was close to that obtained with the classic Bruce and Klute method except when soil water content was near saturation. The whole process could be done quickly with the aid of a computer program without the trouble of freehand drawing. Therefore, the method is a simple workable one for calculation of soil water diffusivity.
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