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以新疆典型盐渍区——渭干河-库车河三角洲绿洲为研究对象。首先,基于1989,2001,2006年的TM/ETM+遥感数据,以RS为技术手段,借助GIS空间分析方法、植被指数法,根据像元二分原理,采用复合植被指数VBSI估算植被覆盖度,其估算精度达到83.52%;其次,生成渭干河-库车河三角洲绿洲植被覆盖度分级图,并对其格局变化进行分析与评价,揭示出渭干河-库车河三角洲绿洲植被覆盖的时空变化规律。中高覆盖度、高覆盖度以林地、草地和耕地为主,对保持植被覆盖度起重要作用;林地面积的变化对重心转移起关键作用,而草地、耕地的波动则会影响到重心转移方向;林地、草地和耕地对于保持地区植被覆盖率有重要作用,应在长期土地利用规划中坚持植树造林,保持草地、保护耕地和控制未利用地;最后,利用植被覆盖度图像所提供的各覆盖度级的数量和空间分配状况来评价该绿洲植被覆盖度的动态变化,并进一步分析植被覆盖度变化的原因。基于遥感技术进行渭干河-库车河三角洲绿洲植被覆盖度动态变化分析的研究思路和方法能够为该绿洲生态环境保护提供参考依据。
A typical saline area in Xinjiang - Weigan River - Kuqa River Delta oasis for the study. Firstly, based on TM / ETM + remote sensing data from 1989, 2001 and 2006, RSI was used as a technical measure to calculate the vegetation coverage based on the binomial principle of pixels with GIS spatial analysis method and vegetation index method, and its estimation And the accuracy is 83.52%. Secondly, a graded map of vegetation coverage of the Weigan-Kuqa River delta oasis is generated, and the change of its pattern is analyzed and evaluated to reveal the temporal and spatial variation of the vegetation coverage of the Weigan-Kuqa River delta oasis . Middle and high coverage and high coverage are dominated by woodland, grassland and arable land, which play an important role in maintaining vegetation coverage. Changes in woodland area play a key role in shifting the center of gravity, whereas fluctuations in grassland and arable land affect the direction of the center of gravity transfer. Forest land, grassland and cultivated land play an important role in maintaining the vegetation coverage in the region. They should insist on afforestation, grassland maintenance, farmland protection and unutilized land use in long-term land use planning. Finally, using the coverage provided by the vegetation coverage images The quantity and spatial distribution of the vegetation to evaluate the dynamic changes of the vegetation coverage of the oasis and further analyze the reasons for the changes of the vegetation coverage. The research ideas and methods of dynamic change analysis of vegetation coverage in the Weigan-Kuqa River delta based on remote sensing technology can provide reference for the protection of the ecological environment of the oasis.