北江上游水土流失现状遥感分析

Analysis on Soil and Water Losses in Upper Reaches of Beijiang River Basin Based on Remote Sensing

北江上游是我国南方红壤区水土流失较严重的典型区域,需要摸清该区域的水土流失状况,为水土流失综合防治决策提供依据。以2007—2008年10 m分辨率的Alos多光谱遥感影像为数据源,采用人机交互解译方法,对北江上游水土流失现状进行了遥感分析。结果表明:北江上游土地利用以林地和耕地为主,植被覆盖状况良好,但地形陡峭,水土流失面积达2 860余km^2,侵蚀强度以轻度、中度为主,主要分布于武江水系湖南境内宜章、临武两县和广东境内乐昌市,浈江水系广东境内的南雄市和始兴县,以及浈江、武江和干流段交汇处的曲江区和乳源县。

The upper reaches of Beijiang River is a typical region which has serious soil and water losses in southern china,and the sta-tus of soil and water losses in this region need to know with the purpose of providing basic data for soil and water losses preventing and control.The current status of soil and water losses in this region was analyzed based on Alos satellite images of 2007 -2008 in this pa-per,the results show that:the main land use types were forestry and farmland,and the vegetation covers were fine,but the slopes were steep,therefore the area of soil and water losses was more than 2860 km2 ,and the main erosion intensity grade was mild and moderate, and mainly distributed in the mountains and hills of Yizhang county,Linwu county and Lechang county along sides of Wuijiang River basin,and Nanxiong county,Shixing county along sides of Zhenjiang River basin,and Qujiang county and Ruyuan county.