【摘要】 以长江流域中下游防护林建设区湖北省红安县境内倒水河流域4期遥感影像为主要数据源,基于通用土壤流失方程,运用遥感和地理信息系统技术,对研究区20余年的土壤侵蚀进行估算,分析了自长江防护林建设以来的全区土壤侵蚀动态变化,以及林区土壤侵蚀动态特征。结果表明:随着长江防护林建设的深入开展,该流域的森林覆盖率从1979年的20.84%恢复到了2001年的37.25%,土壤侵蚀得到明显控制。侵蚀面积从75736.1 hm2减少到66707.8 hm2,共减少了9028.3 hm2。中度及以上强度的土壤侵蚀已基本消失,林区无明显侵蚀的面积从1928.6hm2增加到12803.1 hm2,增长了近6倍。林区土壤侵蚀已以中度侵蚀为主转变为以轻Ⅰ侵蚀为主,森林植被的恢复对流域的水土保持产生了十分重要的作用。更多还原

【Abstract】 Based on four phases of remote sensing image data in 1979,1987,1993 and 2001 from the region of Daoshuihe basin in Hongan county,Hubei province,which is a part of the Protection Forest Project at the middle and lower reaches of the Yangtze River,this paper estimated soil erosion in more than 20 years,and analyzed soil erosion dynamics in the whole studied region,especially in the forest area,using techniques of Universal Soil Loss Equation(USLE),remote sensing(RS) and geographic information system(GIS).The results indicated that the percentage of forest cover in this basin had been increased from 20.84% in 1979 to 37.25% in 2001,and soil erosion had been remarkably controlled.Soil erosion area was decreased from 75736.1 hm2 in 1979 to 66707.8 hm2 in 2001.The state of serious soil erosion in forest area had also been radically controlled,and the area without obvious erosion had been increased from 1928.6 hm2 to 12803.1 hm2.Middle degree erosion was replaced by Light erosionⅠin forest area.Vegetation recovery and restoration played a very important role in conserving soil and water.更多还原