韩江上游水土流失现状遥感分析

韩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。本文以2008年10m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，对韩江上游水土流失现状进行了遥感分析，结果表明：韩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5102．56km2，侵蚀强度以轻度为主，主要分布于广东境内梅江及其支流两岸五华、梅县、兴宁和平远县的山丘区，以及福建境内汀江流域上中游上杭、长汀、武平和永定县的山丘区。

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

The upper reaches of Hanjiang River is a typical region which has serious soil and water losses in the red soil areas of southern China, it is necessary to know clearly the soil erosion status in this area so as to provide the basis for the soil erosion comprehensive prevention and control policy making. Based on the Alos satellite images with 10m resolution in 2008, it was conducted the remote sensing analysis to the soil erosion status at the upper reaches of Han- jiang River by using the human - computer interactive interpretation method. The results showed that the main land use types in this area were forest and farmland with good vegetation cover. However, due to the steep terrain, the soil ero- sion areas still reached over 5,100 km2, that are slight erosion mainly distributed in the hilly areas of Wuhua, Meixian, Xingning ＆ Pingyuan Counties at both sides of the Meijiang River and its branch of Guangdong Province and the hilly areas of Shanghang, Changting, Wuping and Yongding Counties at the upper and middle reaches of Tingjiang River Basin in Fujian Province.