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对盐碱地土壤水盐运动的定量描述是控制区域土壤次生盐碱化的基础，其中的土壤水分扩散率是研究土壤水盐运动的重要参数之一。文章通过非稳定流水平土柱法对实验区扰动的盐碱地土壤水分扩散率进行了测定，并将实验结果拟合为经验公式，然后将测定的土壤水分扩散率应用于水平入渗方程，用数值计算软件Mathcad6.0对土柱水分水平入渗进行了数值模拟，将实测结果和方程模拟的土壤水分分布状况进行了对比。结果表明本研究得出的土壤水分扩散率的经验方程误差较小。最后讨论了影响土壤水分扩散的土壤质地因素及土壤水分扩散率和含水率之间的单值函数关系。
Quantitative description of water and salt movement in saline-alkali soil is the basis of secondary salinization of soil in controlled area. Among them, the soil moisture diffusivity is one of the important parameters to study soil water and salt movement. In this paper, the soil moisture diffusivity of saline-alkali soil disturbed by the experimental area was measured by the unsteady flow-horizontal soil column method, and the experimental results were fitted to the empirical formula. The measured soil moisture diffusivity was then applied to the horizontal infiltration equation, Computational software Mathcad6.0 was used to simulate water column infiltration in soil column. The measured results were compared with the soil moisture distribution simulated by equation. The results show that the error of empirical equation of soil moisture diffusivity obtained in this study is small. Finally, we discuss the single factor function relationship between soil texture factor affecting soil moisture diffusion and soil moisture diffusivity and water content.