淤地坝内外坡地土壤水分含量对比研究

Comparative Study on Soil Moisture Content outside and inside Slope Land of Check-dam

以陕北神木六道沟流域的一个淤地坝为例,测定了坝内外坡地的土壤水分含量,旨在探讨淤地坝对坡地土壤水分含量的影响。结果表明：由于植被和环境影响等因素,淤地坝并未造成坝内坡地土壤平均含水量的增高,对坝内坡地土壤表层水分含量也没有明显影响,淤地坝只增加了坝内坡地80-200 cm深土壤的水分含量;沿垂直坝体方向,坝内坡地80-200 cm深土壤水分含量表现出从外到内线性增大的趋势;淤地坝的存在增加了坝内坡地的储水量,且不同坡位的储水量表现为坡下〉坡中〉坡上;坝内坡地土壤剖面水分含量的标准差与平均值、变异系数均呈极显著的正相关,而坝外则呈显著的正相关。

Based on a typical check-dam of shenmu six gap river basin in Shaanxi province, analyzed the soil moisture distribution both on the inside and outside slope of the check-dam to look into the effect of check-dam on soil moisture. The results showed that the check-dam had not increased the mean soil moisture in the inside slope for the cause of plant consuming and had little effect on the soil surface moisture which was effected by the environment conditions greatly, the depth of 80- 200 cm was effected by the check-dam. Along the vertical direction of the check-dam, the soil moisture content（ 80-200 cm） of the slope land increased linearly from inside to outside. The construction of check-dam could increase the storage of soil water of inside slope, the order in magnitude was： down slope〉mid slope〉up dope, For the inside slope, the standard deviation to the average soil moisture and the coefficient of variation were high significantly positive correlation （R^2〈0.01） , and outside slope was significantly positive correlation （R^2〈0.05）.