陕北沙黄土区现代侵蚀过程及其成因

本文根据野外考察,指出陕北沙黄土区的现代土壤侵蚀过程表现为风、水两相营力的共同作用,形成的地表形态具有风成和水成的双重性特征,在区域分布上具有交错性.这是由营力的季节性强弱对比和地表组成物质的区域差异所形成的.区内主要地面物质沙黄土可以分为细沙质沙黄土和粉沙质沙黄土,二者对风力和流水的抗侵蚀性不同.

The Ground Surface Material Features and the Erosipnal Interaction of Wind and Water in the Sandy Loess Terrain in North Shaanxi Province

It is the coarse and loose ground surface material which can be divided into two parts fine-sand sandy loess and silt-sand sandy loess that has low resistivity and easily eroded property in the sandy loess terrain in north Shaanxi Province. The wind processes are always accompanied with water processes in intensity, which happen alternatively in the four seasons and in districts. Owing to the interaction detween wind and raindrop impacting,laminar flow denudation and linear denudation, the vertical erosion zones are formed with doth windy and water erosion features on the hill slope. There have deen at least 14 cycle processes of shifting sand action since the earlier Q_2 in this area.