大方县退耕还林十年植被恢复变化的研究

摘要

To evaluate the benefit of returning cropland to forest, close attention has been paid to the changes during the project being put in practice in Dafang Country. By taking landsat TM images in 2000 and 2010 as data source and with the help of the platform of ARCGIS and ERDAS software, research and monitor of a lot of changes—the variation of vegetation coverage, vegetation types, different slope of vegetation restoration and the quality of ecological environment have been recorded since returning farmland to forest conducted in Dafang County so as to auantitative analysis them.It indicates that:compared to 2000, in the 2010 year, low vegetation coverage area has significantly reduced, above moderate coverage area of vegetation coverage in-creased significantly;farmland mainly converted to woodland, grassland and orchard, among which the most significant increase in forest area; the range of above15 degrees of slope forest area has increased from 18.67%in 2000 increased to 25.85%in 2010;the quality of ecological environment of the country has been improved and the index has been increased by 0.0443,the overall improvement of environmental quality ef-fect is remarkable.%为掌握大方县退耕还林前后植被恢复变化状况来评价退耕还林工程实施效果，以2000年和2010年landsat TM影像为数据源，借助ARCGIS和ERDAS平台，对该县退耕还林以来的植被覆盖度、植被类型变化、不同坡度植被恢复情况以及生态环境质量进行定量分析。结果表明：相较于2000年，2010年低等盖度植被覆盖度面积大幅减少，中等盖度以上的植被覆盖度面积大幅增加；耕地主要转变为林地、草地和园地，其中林地面积增加最为显著；以上坡度范围林地面积比例由2000年的18.67%提高到2010年的25.85%；大方县生态环境指数提高了0.0443，生态环境质量整体改善效果显著。