黄土残塬区泻溜侵蚀土体水分物理性质研究

Research on Hydro-Physical Properties of Slumping Erosion in Remained Loess Area

采用环刀法对红土泻溜侵蚀坡面0~50 cm深度和坡积物0~100 cm深度的土壤水分物理性质和贮水特征进行了对比研究,结果表明:(1)0~50 cm深度范围内,红土泻溜坡面土壤含水率、容重、总孔隙度均随土层深度的增大而增大,土层深度与土壤含水率成显著正相关关系、与土壤容重和紧实度均成极显著正相关关系,非毛管孔隙度与总孔隙度成极显著正相关关系;(2)0~100 cm深度范围内,红土泻溜坡积物的容重和孔隙度随着土层深度的增大无明显的层次变化趋势,与红土泻溜坡面相比,泻溜坡积物土体紧实度和容重显著降低,非毛管孔隙度减小,毛管孔隙度增大,而总孔隙度变化不大;(3)与同一深度(0~50 cm)的红土泻溜坡面相比,红土泻溜坡积物滞留贮水量减小了77.94%,吸持贮水量增大了28.74%,而饱和贮水量差异不大(仅增大8.28%)。

Based on the cutting-ring method,compartive study on soil hydro-physical properties and water storage capacity of red soil slumping erosion（ 0-50 cm） and slope sediment（ 0-100 cm） were carried out. The results show that： a） with the increase of soil depth within the range of 0-50 cm,soil moisture content,soil hardness and bulk density of red soil slumping erosion slope increase gradually. Soil depth and soil moisture content are of a significant positive correlation. Soil depth and the bulk density and soil hardness also have a significant positive correlation. Non-capillary porosity and total porosity have a significant positive correlation. b） With the increase of soil depth at the range of 0-100 cm,bulk density and porosity of slope sediments have no obvious layer variation tendency. Compared with red soil slumping erosion slope,soil hardness and bulk density of slope sediments are obviously decreased,soil non-capillary porosity is decreased,capillary porosity is increased,and total porosity changes a little. c） Compared with red soil slumping erosion slope at the same soil depth level（ 0-50 cm）,retention capacity of water storage of slope sediments is decreased by 77.94%,absorption capacity of water storage is increased by 28.74%and saturation water storage capacity is little different（ only reduced by 8.28%）.