基于NDVI的干旱区典型绿洲植被覆盖动态变化分析——以策勒绿洲为例

Dynamic changes of vegetation cover in typical oasis of arid areas based on NDVI——A case study in Cele Oasis

绿洲是干旱气候特有的产物，植被变化可以很好反映绿洲的展缩，而策勒绿洲是典型的干旱区绿洲。因此，文中选取策勒绿洲两个不同时期的TM影像，通过归一化植被指数和植被覆盖度像元分解模型，研究了1990～2000年策勒绿洲植被覆盖度的动态变化。研究表明：在此期间策勒绿洲植被呈退化、绿洲缩减、荒漠化加剧；最后结合自然与社会因素对植被覆盖变化原因进行详细分析，并提出相应对策。

Oasis is the unique product of arid climate, where the vegetation change can reflect the oasis change well. Cele oasis is a typical arid oasis, so its two different periods of TM images were chosen to study the dynamic changes from 1990 to 2000 based on the NDVI and the sub - pixel vegetation coverage model. Research showed that during this period, the vegetation in Cele oasis degenerated , oasis reduced , desertification intensified. At the same time, the reason that cause the vegetation cover change was analyzed with the natural and social factors detailedly, and the remedial measures were proposed.