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.研究以黑惠江、龙川江、盘龙河流域为例,探讨了云南纵向岭谷区土地利用对土壤侵蚀的影响.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.
Land use changes the pattern and extent of soil erosion directly, and it has outstanding erosion - environmental effect. This study, taking three drainage areas as an example, probes into the effect of land use on soil erosion in the Longitudinal Range - Gorge Region in west Yunnan. The results show that an internal and mutual transformation of land - use types cause striking changes in soil erosion extent. The transition of cultivated land to woodland and grassland medicates erosion intensity, and the one from forestland to cultivated land and grassland aggravates erosion. In addition, land -use practices, including mainly human activities, have impacts on the content of suspended sediment. In the places with an increase of forest area and a decrease of soil erosion, suspended sediment concentration is reduced. A contrary result is seen in poorly forested and highly eroded areas.
出处
《昆明理工大学学报（理工版）》
CAS
北大核心
2009年第4期68-72,共5页
Journal of Kunming University of Science and Technology(Natural Science Edition)
基金
国家"973项目"专题(项目编号:2003CB415105-6)
云南省自然科学基金(项目编号:2006D0080M)
