针对干热区气候特点,设置了旱坡地地表盖沙和覆膜两土壤水分处理方式,2003~2005年连续测定其土壤水分变化情况。在地面覆盖物作用下,耕作层40 cm以上土壤水分随降雨量和蒸发强度变化而变化,土层40 cm下土壤水分较稳定;土壤原本含水量的高低影响土壤水分的变化程度。盖膜、盖沙措施使土壤水分只在土壤表层40 cm内有不同程度增加。总体来说,盖膜增加最多,比CK多5%;其次是盖沙,比CK多2.612%。深层土壤水分总体趋势是随土壤深度增加而增加,增加幅度随深度增加不断减少。 According to the climatic characteristics of dry-hot zone, two soil moisture treatments were set up on the surface slope cover and film mulching on the arid slope. The soil moisture change was continuously measured from 2003 to 2005. Under the effect of ground cover, the soil moisture above 40 cm in tillage changed with the change of rainfall and evaporation intensity. Soil moisture was stable at 40 cm of soil layer. The change of soil water content affected the original soil water content. Cover film, cover measures to make the soil moisture in the soil surface within only 40 cm have different degrees of increase. In general, the largest increase in membrane, more than CK 5%; followed by cover sand, 2.612% more than CK. The overall trend of deep soil moisture is to increase with the increase of soil depth, and the increasing amplitude decreases with depth.