基于遥感和GIS技术的祖厉河流域植被覆盖动态变化监测

Dynamic change of the vegetation coverage in the Zuli river basin with RS and GIS technology

利用祖厉河流域1987,1993,2003年的TM图像和2000年的ETM^+图像共四期数据提取归一化植被指数(NDVI),运用混合像元模型(MPM)及NDVI反演植被覆盖度,并划分为4个不同的盖度等级.根据盖度等级的空间分布特征,比较分析了祖厉河流域植被覆盖变化情况.结果表明:整个祖厉河流域植被覆盖在1987-2000年逐步退化,到2000年起开始逐步恢复,经历了从逐步退化到逐步恢复的过程,植被的变化和土地利用方式紧密相关.基于遥感技术进行祖厉河流域植被覆盖度动态变化分析的研究思路和方法,为祖厉河流域生态环境保护提供参考依据.

Using TM image in 1987, 1993, 2003 and ETM＋ image in 2000 of Zuli river basin, normalized difference vegetation index was extracted and the vegetation coverage was calculated according to the mixedpixel model based on NDVI. The vegetation coverage would be divided into four different degrees and the change of the vegetation coverage under spatial distribution was analyzed. The result indicated that the whole vegetation coverage level of Zuli river basin had a trend of gradual degradation from 1987 to 2000, but it began to recover since 2000, and Land Use/Land Cover Changes are closely related to vegetation variation. The method that analyzed dynamic changes about vegetation coverage in Zuli river basin provided the reference for the protection of ecological environment in Zuli river basin.