Spatial differences of soil electrical resistivity and moisture content in slope grassland in Yunwu Mountains and in slope locust forestland in Jingchuan Mountains, Northwest China
In order to understand the spatial distribution of soil moisture along the slopes with dif-ferent vegetation types on Loess Plateau, a longitudinal line transect was installed on a 400-m long slope in Yunwu Mountains at Guyuan and in Guanshan Mountains at Jingchuan in early May 2010, respectively, and the method of multi-electrode electrical resistivity tomography (ERT) was adopted to measure the soil electrical resistivity and moisture content by points simultaneously and continuously. There was a good correlation ( Y=39. 596e-0.0075 x , R2 =0.78) between the soil electrical resistivity and moisture content in the slope grassland in Yunwu Mountains, suggesting that it would be feasible to ascertain the spatial variation of soil moisture on grass slope through measuring the spatial distribution of soil electrical resistivity. In Yunwu Mountains, the soil elec-trical resistivity increased gradually from slope top (308. 5 Ωm) to slope middle (360.44 Ωm) , and then decreased (318. 75 Ωm) on slope bottom; while in Guanshan Mountains, the soil elec-trical resistivity decreased gradually from slope top to slope bottom. The soil moisture content on the grass slope in Yunwu Mountains was higher than that on the locust forest slope in Guanshan Mountains. On the grass slope in Yunwu Mountains, the light, mild, and severe dry soil layers occurred at the depths 1-3 m, 3-4 m, and 6-17 m soil layers; while on the locust forest slope in Guanshan Mountains, the light, mild, and severe dry soil layers occurred at the depths 3 m, 6 m, and ≥ 10 m, respectively.
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维普
万方数据
