中文摘要：

通过在陕北神木县六道沟小流域调查和采样,对比分析了典型沙土二元结构剖面沙层和黄土层的容重、颗粒组成、孔隙度、饱和导水率及水分特征曲线等物理特性。结果表明：片沙覆盖黄土坡面沙土二元结构剖面沙层和黄土层土壤物理特性变化剧烈,差异明显,尤其是颗粒组成、饱和导水率和水分特征曲线。沙土二元结构剖面土壤物理特性的显著差异导致了该类型坡面发生不同于一元结构坡面的特殊入渗、产汇流和侵蚀过程。

英文摘要：

Investigating and sampling were conducted in Liudaogou watershed which located in Shenmu county of Shaanxi province and was a typical watershed in loess hilly region covered by sand of the Loess Plateau.Bulk density,particle composition,porosity,saturated hydraulic conductivity and moisture characteristic curve of sand and loess layer were analyzed in laboratory.The results showed that：The physical properties of sand and loess layer were significantly different,especially for particle composition,saturated hydraulic conductivity and moisture characteristic curve.The significant differences of the physical properties of sand and loess layer resulted in the special process of infiltration,runoff and erosion on this slope.