云南干热河谷旱坡地两种覆盖措施对土壤水分的影响

Effect of the Soil Water of dry sloping field to ground-slipcovers in Yunnan Dry-hot River Valley

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。

Due to the climatic characteristics of dry-hot area, the movement of soil water in different periods under ground-slipcover with sands and film were preliminary studied. Observed data of soil water from 2003 and 2005 showed that under ground-slipcover, the soil water above the surface layer 40 cm is change with rainfall and evaporate intensity, but the soil water under the deep layer 60 cm is stabilization. Through the covering with film and sands, the soil water has increased with the different deep. The cover with the film is the best method, the increase amplitude can be 5 %, then the second one is the covering with sands, which increased 2. 612 % than the comparison.