三峡库区土地覆被动态变化遥感分析

利用 1 995年和 2 0 0 0年TM卫星影像资料 ,对三峡库区 5年内的土地覆被动态变化进行了分析。结果表明 ,该时期库区土地覆被的变化主要表现为林地向草地和耕地转化 ,以及耕地向建设用地转化 ;其次是林地向建设用地转化 ,有林地向灌丛转化 ,以及草地向林地转化。土地覆被的这种变化说明 ,三峡库区近几年来生态环境在总体上呈现继续恶化的趋势 ,仅局部地区有所好转。

Remote Sensing Analysis of Changes in Land Cover in the Three-Gorges Reservoir Region

By using the Landsat TM data of 1995 and 2000,changes in land cover in the Three-Gorges Reservoir region during the 5 years are analyzed.It is shown that the changes in land cover in this region during this period were mainly displayed as conversion of forestland into grassland and cultivated land and of cultivated land into construction land,and secondarily as conversion of forestland into construction land,of forestland into shrubs and of grassland into forestland.Such changes indicate that,in recent years,the ecological environment in the Three Gorges Reservoir region was worsening on the whole,except some local areas.Therefore,it is essential to enhance protection of the ecological environment with emphases on conservation and rehabilitation of forestland and control of alienation of cultivated land.