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利用宜川森林水文观测站１０年长期定位监测资料，在对影响土壤水分的各单因子进行分析的基础上，把土壤水分视作一个系统进行研究，通过回归分析，建立了不同土层深度水分含量（ｙ）与蒸腾强度（ｘ１）、林地蒸发量（ｘ２）、降水量（ｘ３）、地表径流深（ｘ４）的回归方程ｙ＝Ａ＋Ｂｘ１＋Ｃｘ２＋Ｄｘ３＋Ｅｘ４，回归方程相关系数高，结果表明影响林地土壤水分的主要因子是降水和林木蒸腾作用，其次为林地蒸发，影响最小的为地表径流。同时还对各因子间相互关系进行了分析，为黄土丘陵区林草植被建设提供科学依据。
Based on the long-term monitoring data of Yichang Forest Hydrological Observatory over a period of 10 years and based on the analysis of each single factor affecting soil moisture, the soil moisture was regarded as a system to study. Through regression analysis, the depth of different soil moisture The regression equation y = A + Bx1 + Cx2 + Dx3 + Ex4 between the content (y) and the transpiration intensity (x1), the forestland evaporation (x2), the precipitation (x3) and the surface runoff depth (x4) showed a high correlation coefficient of the regression equation. The main factors are precipitation and forest transpiration, followed by forest land evaporation, with the least impact on surface runoff. At the same time, the interrelationships among the factors were also analyzed to provide a scientific basis for the construction of forest and grass vegetation in the loess hilly region.