毛乌素沙地南缘植被覆盖度动态监测——以陕西省靖边县为例

Dynamic Monitoring of Vegetation Coverage in Southern Edge of Maowusu Sandland

监测毛乌素沙地边缘的植被覆盖状况,为治理沙地提供科学的数据。以1986和2000年的TM影像为基础,利用RS、GIS技术和植被指数,动态监测毛乌素沙地南缘的植被覆盖度,揭示陕西省靖边县植被覆盖格局的变化趋势,并且利用ERDAS IMAGIG 8.6软件实现了植被覆盖度模型的建立及该模型输出图像的分类。1986-2000年间靖边县的植被覆盖度总体呈现上升的趋势,低度和中度覆盖度的区域分别减少了57 155.31和27 997.92 hm^2,高度覆盖度的区域增多了85 153.23 hm^2,这与靖边县加大水土流失治理力度有重要关系。1986和2000年的植被覆盖度比较表明,靖边县的生态恢复呈现了良好的态势。

The research aimed to monitor the vegetation coverage status in the edge of Maowusu sandland so as to provide scientific data for controlling sandland.On basis of TM Images in 1986 and 2000,with RS and GIS technologies and vegetation index, the vegetation coverage in southern edge of Maownsu sandy land was monitored dynamically to reveal change trend of vegetation covering pattern in Jingbian County of Shaanxi province. ERDAS IMAGIG 8.6 software was used to realize the establishment of vegetation coverage model and the classification of output image in this model. Vegetation coverage of Jingbian county in 1986 - 2000 showed a trend of increasing as a whole, the areas with low and middle coverage decreased 57 155.31 hm^2 and 27 997.92 hm^ respectively and the areas with high coverage increased 85 153.23 hm^2 ,which had important relationship with strengthening harnessing force of soil and water loss in Jingbian county. The comparison on vegetation coverage in 1986 and 2000 indicated that ecological restoration in Jingbian county presented a good situation.