林学专业 右玉县三北防护林植被覆盖的变化趋势

右玉县三北防护林植被覆盖的变化趋势内容摘要本文根据朔州市右玉县在 Landsat 系列影像对 1990 年、2000 年、2010 年、2016年 4 期土地利用/覆被空间数据集，计算 3 个时间段内（1990-2000 年、2000-2010 年、2010-2016 年）覆被转变方向、土地利用/覆被转变指数、幅度及速度，分析右玉县三北防护林工程从 1990 年开始以林地及其他用地的时空变化。结果显示：① 1990-2016年，右玉县生态状况逐步好转，三北防护林面积不断扩大。各类用地中林地面积数量明显上升，草地面积数量的提升仅次于林地。②近 30 多年以来右玉县三北防护林地区地覆被状况指数变化以及土地利用/覆被转类指数表明林地面积变化三个阶段中，2010年到 2016 年土地利用类型转化量最大，为 13.028hm2，占右玉县土地所有占地面积的65.41%。这一系列的变化为右玉县发展可持续的生态环境保护工作提供科学参考。【关键词】土地利用/覆被变化 转类方向 右玉县三北防护林 林地扩张The Change Trend of Vegetation Cover in Three North Shelterbelts in Youyu CountyAbstractContent in this paper,According to Shuozhou Youyu county in Landsat5TM images for 1990, 2000, 2010, 2016, 4 land use/cover, spatial data collection, calculation of three periods (the 1990 s - 2000, 2000-2010, 2010-2016) of land use/cover conversion direction, index of land use/cover change and land use/cover change amplitude and speed, the analysis of Youyu three north shelter forest project began in 1990 with the changes of time and space of woodland and other lands. The results showed that the change of forestland area was the most obvious. From the 1990s to 2000, the ecological situation gradually improved and the woodland area expanded on a large scale. Over the past 30 years, the land cover status index changes in the three north shelterbelts of youyu county and the land use/cover conversion index indicate that the land use type conversion from 2010 to 2016 is the largest in the three stages of forest land area change, a...