北京山区植被覆盖动态变化遥感监测研究

Study on the Vegetation Coverage Changes Monitoring of Beijing City by Remote Sensing

植被覆盖变化遥感监测是区域生态监测的一个重要部分,可为区域生态建设和可持续发展提供科学依据。利用北京市1979年7月14日和2005年7月25日的LandsatMSS和TM影像,采用基于归一化植被指数(ND-VI)的像元二分模型,计算了这2个时期的植被覆盖度,并对北京山区1979—2005年间植被覆盖的变化情况进行了遥感监测和定量分析。结果表明,北京山区的植被覆盖度由1979年的70.05%下降为2005年的66.14%;植被退化的总面积为3672.90km2;植被覆盖度在80%～100%的退化面积最大,为617.45km2。

Monitoring vegetation coverage change from remote sensing data is very important for ecological restoration. In this paper, there were two Landsat TM/MSS images of Beijing, which acquired on July 14,1979 and July 25,2005, selected. The vegetation coverage were calculated based on two components sub-pixel model. The vegetation coverage and its changes between 1979 and 2005 were also analyzed. The result showed that： the vegetation coverage decreased from 70.05% in 1979 to 66.14% in 2005 ; the total area of the vegetation degradation was 3672.90km^2; the pixels with a coverage larger than 0.8 were most seriously degraded, and the area is 617.45 km^2 .