利用1982—1999年的AVHRR—NDVI数据和贵州省的气象观测数据,依据距平均一化植被指数(NDVI)和距平湿润指数(MI),通过与非喀斯特地区的对比分析,研究了贵州喀斯特地区植被覆盖的变化趋势及其与气候湿润程度的关系,并对贵州省的生态建设进行了简要的评估,得出以下结论:贵州喀斯特地区的植被覆盖总体处于上升趋势;20世纪80年代处于湿润程度逐渐下降的时期,90年代初,湿润程度缓慢上升;喀斯特地区存在相对干旱和相对湿润两种不同的地表环境,从而其植被覆盖变化与气候湿润程度的关系也存在较大差异;贵州近20年的生态建设和保护工作取得了一定成效。
The vegetation cover is a major feature for the ecological system. The karst region, especially in Guizhou province, possesses quite fragile ecological environment because of its peculiar cavern geomorphology. It is necessary to study the changes of vegetation cover in the karst region, which will help us understand the climate influences and the impacts of human activities. In order to understand the changes of vegetation cover and its relation to climate humidity in karst region, the data of AVHRR-NDVI and the information from meteorological stations in Guizhou province covering 1982-1999 are used in the analysis. The following conclusions are drawn. Firstly, the vegetation cover is increasing over the time. Secondly, the humid degree is descending from 1982 to 1990 and ascending since 1990s. Thirdly, there are two different kind of conditions—relatively humid and relatively arid in the karst region, so regional differences between vegetation cover and climate humidity also exist. Lastly, certain achievement has been made on ecological reconstruction and protection in Guizhou province.