【摘要】 土地利用直接改变土壤侵蚀的方式和强度,具有突出的侵蚀环境效应。以黑惠江、龙川江、盘龙河流域为例,探讨了云南纵向岭谷区土壤侵蚀对土地利用的响应关系。研究表明,本区土地利用类型的内部转化和相互转化引起土壤侵蚀程度的明显变化;耕地向林地、草地的转化使侵蚀强度指数显著降低;林地向耕地、草地转化,均显著增加侵蚀强度指数;耕地、林地、草地的内部转化对土壤侵蚀也有少量影响。另外,以土地利用为主的人类活动明显影响河流悬移质含量,林地面积提高和土壤侵蚀减弱的区域,年输沙量也相应减少,相反则增加。更多还原

【Abstract】 Land use changes the pattern and extent of soil erosion directly,and it has outstanding erosion-environmental effect.This study,taking three drainage areas(Hehui River,Longchuanjiang River,Panlonghe River)as example,probes into the effect of land use on soil erosion in the Longitudinal Range-Gorge Region in the west Yunnan.The results show that an internal and mutual transformation of land-use types cause striking changes in soil erosion extents.The transition of infield to woodland and grassland medicates erosion intensity,and the one from forestland to infield and grassland aggravate erosion.In addition,land-use practices,including mainly human activities,impacts the content of suspended sediment.In the places with an increasement of forest area and a reducement of soil erosion,a decreasing of suspended sediment concentration can be funded.And a contrary result can be seen in poor forested and eroded areas.更多还原