摘要
以通用土壤侵蚀模型为基本思路,选择三江源地区作为研究对象,采用GIS方法对该地区不同土壤侵蚀类型的程度进行了半定量评价。评价结果表明,三江源地区水力侵蚀主要集中在东南和南部的玉树、囊谦、班玛、久治等地区的高山和极高山地区,其侵蚀程度和地形、降水、河流和人类活动等因素分布相关;冻融侵蚀主要分布在三江源区的西北大部分地区,全区中等侵蚀程度以上的地区约占全区面积的1/2以上。
In this paper,based on the common soil erosion model,the Three-River Headwaters region was select for study object. GIS methods are applied to conduct Semi-quantitative assessment for different types of soil erosion,and some results are concluded. The water erosion occurs in High Mountain and extra-high mountain of Yushu,Nangqian,Banma and Jiuzhi County in the southeast and south of the Three-River Headwaters region. The degree of erosion is prone to topography,precipitation,river and human activity. The freeze-thaw erosion mainly distributes in the northwest of the Three-River Headwaters region. The area of middle and above middle erosion degree accounts for roughly 50%.
