Research on Vegetation Coverage Change in Sheng Jin Lake Wetland of Anhui Province

摘要

The vegetation coverage in different areas was calculated based on remote sensing images (TM images) in 1986, 2002 and 2011 by employing the method of dimidiate pixel model in Sheng Jin Lake of Anhui province. The vegetation fraction maps of different periods were generated to analyze the temporal change of the vegetation fraction of the Sheng Jin Lake area. The results showed that the vegetation fraction changed greatly from 1986 to 2011. The average vegetation fraction increased from 57.02 to 60.30 %, the medium vegetation coverage continued to increase. The vegetation coverage decreased sharply from 1986 to 2002, and then increased slightly, from 2002 to 2011. The vegetation coverage presented the trend of degradation to recovery. The proportion of the experimental area affected by this trend was larger, which played a considerable role in the environmental quality. In the future, ecological environmental construction should be considered in the experimental area, because of the increasing environment problem in recent decades.