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为了解黄土区不同植被类型坡面土壤水分的空间分布,选择固原云雾山和泾川官山于2010年5月初采用多电极电阻仪法(ERT)在长约400m的坡面上设置纵向样线,并多点同步连续测定土壤含水率和电阻率。结果表明:云雾山土壤电阻率和含水率的相关性较好(Y=39.596e-0.0075x,R2=0.78),说明通过测定坡面电阻率推求土壤水分的坡面变化是可行的。云雾山电阻率沿坡面表现为坡上(308.5Ωm)至坡中(360.44Ωm)逐渐增大,到坡下部又逐渐减小(318.75Ωm);而泾川刺槐林坡面从坡上到坡下电阻率逐渐减小,且云雾山草坡含水率要大于泾川刺槐林。云雾山草坡在1～3m土层出现轻度干层,3～4m深度出现中度干层,6～17m出现重度干层;泾川刺槐林在3m土层出现轻度干层,6m深度出现中度干层,在≥10m层出现重度干层。
In order to understand the spatial distribution of soil moisture on different vegetation types in the Loess Plateau, Guiyang, Guyuan, Guyuan and Jingguan Mountains were chosen to set vertical line on the slope of 400m by multi-electrode resistance meter (ERT) , And multi-point continuous determination of soil moisture content and resistivity. The results show that the correlation between soil resistivity and moisture content is good (Y = 39.596e-0.0075x, R2 = 0.78), indicating that it is feasible to determine the slope change of soil moisture by measuring the slope resistivity. The resistivity of the Yunwu Mountain along the slope shows a gradual increase from the slope (308.5Ωm) to the slope (360.44Ωm) and the decrease to the lower slope (318.75Ωm). The slope of the Jingchuan locust forest slopes from slope to slope The resistivity decreased gradually, and the moisture content of the misty hillside slope is greater than Jingchuan locust forest. There was mild dry layer in 1-3 m soil layer, moderate dry layer in 3-4 m depth and heavy dry layer in 6-17 m. Light dry layer occurred in 3 m soil layer of Jingchuan acacia forest, and depth of 6 m Moderate dry layer appears, in the ≥ 10m layer appeared dry layer.