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摘要： 在若尔盖湿地以1989、2000、2005和2010年的Landsat TM/ETM数据为信息源提取土地覆盖以及植被覆盖度信息,结合ASTER DEM数据,在地理信息系统技术空间分析功能的支持下,依据水利行业《土壤侵蚀分类分级标准》(SL190-2007),通过叠加分析对研究区近20 a水土流失变化状况进行评估并分析了其与沼泽萎缩的关系。研究结果表明:若尔盖湿地土壤水力侵蚀面积广,但是程度轻;2000年以前水土流失程度加重,泥沙淤积是沼泽快速萎缩的原因之一;之后在相关生态环境建设和恢复措施作用下水土流失程度有所减轻,沼泽萎缩也呈减缓趋势。 关键词： 若尔盖湿地;  水土流失;  遥感评价     Abstract: This paper takes Zoige Wetland as the study area to get the water and soil loss change and its effects on the shrink of marshes.In the study,the Landsat TM/the ETM data acquired in 1989,2000,2005 and 2010 which have been used to derive the land cover and vegetation fraction data,and Aster DEM derive the grade of slope.According to ‘Standards for classification and gradation of soil erosion (SL190-2007)’,the data in the raster format have been overlaid to assess the status and change trend of soil erosion in Zoige Wetland in last 20 years with the support of spatial analysis of GIS.The results show that the hydraulic soil erosion area is widely spread in Zoige Wetland,but the gradation of water and soil erosion is slight.The degree of soil and water loss is aggravating and sediment deposition resulted from the soil erosion is also one of the main reasons for the rapid shrinkage of marshes before 2000.Its degree has shown the decreasing trend under the ecological environment construction and recovery measures after 2000,and  the marsh shrinking speed has also slowed down.

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