中文摘要：

在3S技术的支持下,利用额济纳天然绿洲80年代、1990年和2009年3期Landsat-TM影像,对额济纳天然绿洲植被类型进行判读,结合实地调查,采用景观生态空间分布格局分析方法,确定植被类型,将研究区可以分为林地、灌木、草地、水体、耕地、居民地、荒漠7个类型。使用GIS分析工具,从各类土地分布面积变化和类型转移趋向与幅度两个方面,分析了额济纳天然绿洲25年来LUCC及景观格局。研究表明：25年来额济纳天然绿洲各土地利用类型及景观格局指数均发生了重要变化,LUCC变化表现出草地和灌木大幅度减少,荒漠显著增加;景观类型多样性指数（H）及土地利用均匀度指数（E）减少,土地利用优势度指数（D）增加;反映额济纳天然绿洲生态环境逐渐恶化的趋势,绿洲主体景观类型的面积明显缩减,荒漠景观生态类型面积逐年递增,植被退化严重。

英文摘要：

Based on the interpreted Landsat-TM image data in 1980s,1900 and 2009,By the support of the ＂3S＂ technology we analyzed characteristics of landscape patterns in Ejin natural oasis,Seven types of land use were identified：woodland,bush,grassland,water,cultivated land,settlement place and desert.Using GIS analysis tools,various types of land distribution and transfer trend and amplitude were analyzed from two aspects by using 25 years Ejin oasis LUCC and landscape pattern.The results showed that various types of land use and the oasis of landscape structure index were changed in Ejin natural oasis over 25 years,LUCC showed Significant reduction in grass and shrubs,a significant increase in desert;Landscape diversity index and evenness index of land use decreased in land use.Contrary dominance index increased.It showed deteriorating trend for ecological environment of oasis.