基于NDVI的绿洲植被生态景观格局变化研究

使用经严格配准的同一季相 1990年和 1998年Landsat -TM和SPOT -HRV图像数据为基础底料 ,编制规一化植被指数 (NDVI)图 ,进而简化生成植被盖度图像。根据策勒绿洲特有的生态景观特征 ,利用两个图像所提供的各植被覆盖级的数量和空间密度分配状况 ,来评价图像所包括时段植被生态环境质量的变化 ,提出绿洲植被生态景观若干保护措施

Study on Oasis Vegetation Ecological Landscape Change Based on NDVI

The main purpose of the paper is to workout NDVI according to LANDSATTM image of 1990 and XI multi-spectral SPOT image of 1998 in Qira. In the foundation of ecological character of arid oasis and research achievement, corresponding relation of plant index pixel grade and cover grade are found and NDVI is transformed into plant cover graph . Finally, variation of vegetation environment quality from 1990 to 1998 is evaluated according to distribution of quantity and space condition rendered by plant cover digital image and exploiting and managing ways are pointed out. Comparing two periods plant cover grade images with local statistics materials, the paper points out that the trend of Cele region oasis-desert Ecotone is more weakening in a few years. So, in order to ameliorate the local ecological environment, this paper advocates in Cele country should work hard to plant numerously to preserve their homeland and reduce the degree of sandy wind offensive, develop social economy, carry out sustaining development.