内蒙古必鲁台地区沙漠化时空变化

Spatial and Temporal Changes of Desertification Land in Bilutai Area,Mongolia

[目的]了解内蒙古必鲁台地区土地荒漠化现状及其变化趋势。[方法]基于Landsat-5TM、Landsat-7ETM+及Landsat-8OLI遥感影像,利用决策树分类方法,对必鲁台地区地物信息进行分层提取,研究1985—2015年该地区沙漠化发展动态。[结果]1985年必鲁台地区荒漠化面积1 331.57 km^2,其中重度沙漠化面积300.44 km^2,占22.56%。2015年该地区荒漠化面积1 731.50 km^2,其中重度沙漠化面积398.09 km^2,占22.99%。[结论]1985—2015年必鲁台地区沙漠化总面积呈增加趋势,重度沙漠化面积也在增长,说明研究区沙漠化呈发展趋势。

[ Objective] In order to know the current situation of desertification and monitor its trends in Bilutai area, Mongolia.[Method] We extract multi-layer feature information in Bilutai area used decision tree based on Landsat-5TM, Landsat-7ETM ＋and Landsat-8OLI remote sensing data.And then we explore the land desertification variation tendency from 1985 to 2015.[ Result] The result showed that there was 1 331.57 km2 desertification land area in 1985, where severe desertification area of 300.44 km2 , accounting for 22.56% in study area.There was 1 731.50 km2 desertification land area in 2015, where severe desertification area of 398.09 km2, accounting for 22.99%.[Conclusion] During 1985-2015, the total area of desertification and severe desertification area increased obviously in Bilutai area.Land desertification presents development trend in study area.