中文摘要：

基于Landsat 5 TM遥感影像,以塔里木河下游断流区的荒漠河岸林为例,选取植被指数随植被覆盖度增加的反映速率、植被指数的取值范围变化、植被与背景信息的区分度三个指标,对NDVI、SAVI、MSAVI、GEMI、EVI 5种植被指数探测低覆盖度植被信息的能力进行对比分析。研究表明：根据三个指标的综合分析,GEMI指数是塔里木河下游断流区探测低覆盖度植被信息的最佳植被指数。

英文摘要：

Taking desert riparian forest in the lower reaches of Tarim River as an example,five vegetation indices such as NDVI,SAVI,MSAVI,GEMI,and EVI were used to compare and analyze the ability of detecting low vegetation cover based on Landsat 5 TM imagery using three indicators such as change rate and the range of vegetation index,division degree.The results showed that GEMI is the best vegetation index to detect low coverage of vegetation information in the lower reaches of Tarim River according to the comprehensive analysis of the three indicators.