中文摘要：

土壤侵蚀是造成地表水土流失的直接原因，也是我国国土整治的主要目标和任务。清江流域地处湖北省西南部，严重的土壤侵蚀是该地区生态环境恶化的主要原因，也是社会经济发展的主要限制因素之一。在野外调查的基础上，利用1：10地形图和1995年、2000年两期Landsat—TM遥感影像为基本信息源，在“3S”技术支持下对清江流域的土壤侵蚀进行动态监测。结果显示，5年来清江流域土壤侵蚀（轻度及轻度以上侵蚀、水土流失）面积共减少10．98km^2，减少了0．06％，但全区土壤侵蚀面积仍占土地总面积的40．70％，说明本区土壤侵蚀仍然十分严重。该区经过近5年的水土保持治理和生态环境建设，强度和极强度土壤侵蚀区治理取得了一定进展，没有进一步恶化，而微度、轻度和中度侵蚀区出现了侵蚀强度增大的现象，说明由于各种自然原因和人为原因的存在，该区的土壤侵蚀仍处于边治理边破坏的状态，虽然整体侵蚀面积在减少，但有些地区的侵蚀强度在加重，若不采取合理措施极可能继续恶化而进一步转化为强度和极强度侵蚀。

英文摘要：

Soil erosion is the direct cause of soil and water loss. Qingjiang River Basin lies in the southwest part of Hubei Province. The severe soil erosion is the main cause of environment deterioration and is also one of the main limiting factors on the development of economy in this area. Thus,the authors analyze the soil erosion dynamics in the Qingjiang River Basin using relief maps and remote sensing images of different periods. From 1995 to 2000,the soil erosion area has been reduced by 10.98 km^2 ,or 0.06% ,while soil ero- sion area still accounts for 40.70% of the total land area of the region. This shows that the soil erosion in this region is still severe. After five years of soil and water conservation control and ecological environment construction,the control work in the zones of the intensive degree and very intensive degree is steadily making progress,while it＇s not in other zones. All these imply that for the natural processes and the human activities,both the construction and destruction are still existing,and the degree of soil erosion is increasing, so some countermeasures for treating soil erosion in this region should be taken.