摘要
以甘肃省古浪县冰草湾地区1991、2000和2009年3期Landsat TM影像为数据源,采用基于对象的影像分类方法提取研究区各时期的土地利用/土地覆盖信息,在此基础上分析了研究区土地利用结构变化、土地利用类型转换关系和导致土地利用变化的驱动力因素。结果表明:采用基于对象的影像分类方法精度较高,可以达到准确提取土地利用/土地覆盖信息的目的;1991~2009年,冰草湾地区农田和居民用地的面积持续增加,并向沙漠和盐碱地方向扩张,呈现"人进沙退"的格局;2000~2009年各种土地利用类型之间的相互转换速度明显低于1991~2000年,土地利用状况呈现趋于稳定的趋势。造成土地利用/土地覆盖变化的主要驱动力是引黄灌溉和生态移民工程的实施。
Bingcaowan area in Gulang County,Gansu Province,China,is at the south marginal part of Tengger Desert.Based on three Landsat TM images in 1991,2000 and 2009,land use/land cover distribution at the corresponding period was extracted by an object-based image classification method.On the basis of the classification,the pattern of land use and land cover and the conversion among types were analyzed.The result indicated that,(1)the overall precision of object-oriented classification was better than that of traditional classification method;(2)the area of farmland and residential land in Bingcaowan area continued to increase and expand towards the desert,saline,and alkaline land during 1991 and 2009;(3)mutual conversion among land use and land cover types which happened during 2000 and 2009is obviously slower than that during 1991 and 2000;(4)the main driving forces of land use and land cover change are the construction of the second Jingtai Electric-irrigating Project and ecological migration programs.
出处
《遥感技术与应用》
CSCD
北大核心
2015年第2期383-390,共8页
Remote Sensing Technology and Application
基金
国家自然科学基金项目(41271360)
