青海省龙羊峡库区生态环境变化的遥感分析

ECOLOGICAL AND ENVIRONMENTAL CHANGE INVESTIGATION THROUGH REMOTE SENSING AROUND LONG YANGXIA RESERVOIR, QINHAI PROVINCE

采用美国陆地卫星ETM、TM图像 ,对青海省龙羊峡库区 1 987、2 0 0 0年两个时相的生态环境进行遥感分析。结果表明 ,龙羊峡库区的地貌类型分别为 1 9类 ,查清了各类型的分布区域和面积。对龙羊峡库区 1 3年间生态环境的动态变化进行分析 ,发现该地区在水体、沙地。

Using American Landsat ETM, TM imagines data, the ecological and environmental change investigation through remote sensing in the region around Longyangxia Reservoir in 1987 and 2000 was carried out. The results show that around the Longyangxia Reservoir region, the physiognomy can be divided into 19 categories, of which the areas and distributions have been found out. The analysis of the dynamic changes in ecology and environment from 1987 to 2000 around the region of Longyangxia Reservoir indicates that the areas of water, dene and natural grassland are all changed. The areas of rivers and lakes decreased by 9.78 km 2 and 4.82 km 2 respectively. Up to 2000, the most part of the riverbeds was bare; Qiabuqia River had been dried out; and almost all the lakes in this region had shrunk to some extent. The distributions of the sand lands had the same changes mostly; its area increased by 5.08 km 2 annually; and the sporadic sand hills have joined together into large scale dense sand hills. The total area of the grasslands decreased by 59.47 km 2, and its annual degressive rate was 0.35%.