生态环境变化遥感评价指数的应用研究——以敖江流域为例

利用1994年5月12日与2009年6月6日的Landsat TM和2001年5月23日的Landsat ETM＋卫星影像,选用遥感生态指数（RSEI）,结合流域的植被覆盖度状况,定量评价了15年间敖江流域的生态环境变化与植被覆盖度变化情况,并对二者的关系进行了简要分析.结果表明：15年间,敖江流域生态等级为优所占的面积比例从13.48％上升到24.90％,增加了304.29 km2;植被覆盖度等级为极高的面积增加比例为29.31％.总体看来,敖江流域生态环境状况和植被覆盖状况均有明显的提高,两者具有较好的对应关系.

Application of Remote Sensing Index in Assesing Ecological Changes of Aojiang Watershed

Based on Landsat TM satellite image on May. 12,1994 and June. 6,2009 and the Landsat ETM ＋ satellite image on May. 23,2001, this study quantitatively assessed the ecological environment changes and the change of the vegetation coverage in Aojiang Watershed in the past 15 years using remote sensing ecological index （RSEI） combine with vegetation coverage status. The relationship between ecological environment and vegetation coverage are also briefly analyzed. The result shows that an in- crease of excellent level RSEI area from 13.48% to 24. 90%, and the area of excellent level RSEI increased by 304. 29 km2. The area of vegetation of extremely high coverage increased by 29. 31% for the Aojiang watershed in past 15 years. Overall, the eco- logical environment condition and the vegetation coverage status in Aojiang watershed have obviously improved, both have good corresponding relation.