以长武王东沟小流域为研究对象,研究了黄土高原沟壑区小流域的土壤水分分布特征。结果表明:在王东沟小流域内,土壤剖面中 0-2m的土层经过一个雨季之后,土壤水分得到了部分的恢复;2 m以下土层,由于没有水分补给,相对比较干燥。该流域内农地的土壤贮水量高于草地,草地高于果园地,林地的土壤贮水量最低。而在同一地理位置,土壤的水分分布又受坡度、坡向、坡位、植被类型、植被密度和生物量的影响,表现出一定的空间变异特性
The distribution characteristics of soil water in Wangdonggou watershed in gully region of the loess plateau are studied. The results show that the soil water have renewed in a certain extent after a rainy period in 2m soil profile. In the soil profile below 2m, soil water is dry without water supply. In the whole watershed, the average soil water storage of farm land, grass land, orchard land, and forest land are 465.3mm, 452.8mm, 450.2mm, and 424mm in 2m soil profile; and 627 mm, 620.6 mm, 598.8 mm, and 542.7mm in 3m soil profile. In general, farm land grass land orchard landforest land in soil water content. In the same time, soil water distribution is affected by slope degree, slope direction, slope location, plant category, plant density, and biomass. Moreover, it has some spatial variability.