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半湿润地区沙地在植被作用下土壤水分动态随季节变化，可以划分为春、夏、秋、冬四个阶段。随土层深度而增加可划分出几个明显层次；浅耕层，根系作用下水分极活跃变化层，地下水持续影响层。由于不同植物生氏季不同，植物发育状况不同，生长所处位置不同而呈现出特定的土壤水分变化形势。降水、土壤性质、地下水强烈地影响着本沙地土壤水分的动态变化。植物根系对土壤水分动态变化影响明显。植被覆盖下的半湿润沙地表层干沙层发育最大可达４—５ｃｍ。
Semi-humid sandy land under the action of vegetation changes in soil moisture with the seasons, can be divided into spring, summer, autumn and winter four stages. With the depth of the soil increases can be divided into several obvious levels; shallow tillage, the root system under the action of extreme changes in water layer, groundwater continues to affect the layer. Due to the different plant growth rate of different plants, different plant development status, the location of growth presents a specific situation of soil moisture change. Precipitation, soil properties and groundwater strongly influence the dynamic changes of soil moisture in this sandy land. The effect of plant roots on the dynamic changes of soil moisture is obvious. The dry sandy layer on the surface of sub-humid sand covered by vegetation covers up to 4-5cm.