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选取藏东南地区的典型小流域,通过网格法在流域的阴坡和阳坡分别采集表层(0-10cm)和底层(20-30cm)环刀土样,研究土壤饱和导水率和土壤容重在流域内的空间分布。结果表明:不同土层相比,表层土壤的饱和导水率以及土壤容重均低于底层值;阴坡和阳坡相比,阳坡的平均土壤饱和导水率和土壤容重高于阴坡,且其变异程度更大;沿坡长方向,土壤饱和导水率从坡顶到坡底呈增大趋势而土壤容重呈减小趋势;土壤饱和导水率与土壤容重之间呈显著负相关(P<0.05)。
A typical small watershed in the southeastern part of Tibet was selected. Soil samples of surface layer (0-10 cm) and bottom layer (20-30 cm) were collected by grid method on the shady and sunny slopes of the basin to study the effect of saturated hydraulic conductivity and soil bulk density Spatial distribution within the catchment. The results showed that the saturated hydraulic conductivity and the bulk density of surface soil were lower than those of the bottom layer in different soil layers. Compared with the sunny slope, the average soil saturated hydraulic conductivity and soil bulk density of the sunny slope were higher than those of the shady slope, And the degree of variation was greater. Along the slope length, the saturated hydraulic conductivity of the soil increased from the top of the slope to the bottom of the slope, while the bulk density of the soil showed a decreasing trend. There was a significant negative correlation between saturated hydraulic conductivity and soil bulk density P <0.05).