基于MODIS数据的羌塘国家自然保护区荒漠化遥感反演与评价

基于MODIS数据采用因子分析法,选取MSAVI、NDVI、LST、TVDI四个指标反演羌塘国家自然保护区荒漠化动态变化过程,并进行分级评价.结果表明:①近十年间保护区荒漠化面积总体呈增加趋势,中度和极重度荒漠化面积呈减小趋势,轻度、重度荒漠化面积呈增加趋势；②若拉核心区、缓冲区东部无明显荒漠化现象,实验区与缓冲区西部荒漠化较为严重,美马错核心区、玛依核心区、缓冲区中部荒漠化程度较轻.

DESERTIFICATION REMOTE SENSING INVERSION AND EVALUATION FOR THE QIANGTANG NATIONAL NATURE RESERVE BASED ON MODIS DATA

Based on the data of MODIS,using factor analysis method,inverses and make grading evaluation on the process of the desertification dynamics changes of the Qiangtang national nature reserve with selecting MSAVI,NDVI,LST and TVDI.The results show that(1)the desertification district of protected areas appeared an overall increasing trend in the past decade,moderate and severe desertification area experienced a decreasing trend,and mild and severe desertification area showed a rising trend,and(2)The core area of Ruola and the eastern part of the buffer zone shows no apparent phenomenon of desertification,and experimental zone and the western part of the buffer zone experienced more serious situation,and the core area of Meimacuo and Mayi,and the center of the buffer zone saw a to a lesser extent of desertification.