基于RUSLE的贵州省红枫湖流域土壤侵蚀时空变化特征

摘要

Based on the data of RS、rainfall、DEM and soil, a study of soil erosion of the Catchment of Lake Hongfenghu located in karst ecological fragile area in Guizhou Province during the past 40 years ( 1960 ～ 2004) is taken by using GIS and RUSLE Model. The main contents of the research include: computing the annual amount of soil erosion, assessing the soil erosion intensity in the catchment of Lake Hongfeng during the periods of 1960 ～ 1986、1987 ～ 1997 and 1998 ～ 2004, and discussing the relation between soil erosion and spatio - temporal changes of land use in the past 40 years. Soil erosion in the drainage basin has experienced a process of getting more intense and then weakening. Soil erosion in the west of drainage basin is more serious than in the east. In the three periods, the special change of soil erosion intensity in the west has the character of getting more intense and then getting slight, but the relevant change is slight in the east of the drainage basin.%以贵州省红枫湖流域为研究对象,运用GIS和RUSLE模型分析了该流域1960～1986年、1987～1997年、19982004年三个时段内的年平均土壤侵蚀量和土壤侵蚀强度,并探讨了40多年来流域土壤侵蚀变化的时空变化特征.结果表明,过去40多年来,流域的土壤侵蚀经历了一个先增强再减弱的过程,土壤侵蚀强度空间分布呈西强东弱的格局,且流域西部呈明显先增强再减弱的特征,东部变化相对较小.