通榆县2000-2014年沙质及盐碱质荒漠化监测

利用landsat7、landsat5和landsat8三期遥感影像，对通榆县2000-2014年沙质及盐碱质土地荒漠化变化进行监测。研究结果表明：①研究区荒漠化程度有减轻趋势，荒漠化等级与面积以及破碎程度虽个别有小幅度改变与上升，但整体呈现优化与下降趋势；②整体破碎度指数在2000-2007年由4.57 km2变为5.46 km2，2014年降为3.17 km2，说明研究区2014年荒漠化分布较为破碎零散，连通性较差，而2007年分布较为集中；③质心分布图表明通榆县研究年限内各类型荒漠化质心的位移轨迹呈现出先向东北平移再向南平移的趋势。

Monitoring of sandy and saline-alkali desertification in Tongyu County during 2000-2014

Using landsat7,landsat5 and landsat8 remote sensing images, the changes of sandy and saline-alkali desertification of Tongyu County in 2000-2014 have been monitored. The results show that:① The desertification degree in studied area was decreased. Although there exist a small number of local increases of desertification area, level and fragmentation, it shows an overall optimization and downward trend.② The overall fragmentation index decreased from 4.57 km2 to 5.46 km2 during 2000-2007,and fell to 3.17 km2 in 2014, indicating that the desertification is relatively scattered with poor connectivity in 2014,but more concentratedly distributed in 2007.③ The centroid displacement map illustrated that the centroid of each type of desertification in Tongyu County was moving to the northeast first and then to the south during the studied period.