西北典型生态脆弱区中小城市土地利用演变分析——以宁夏固原市为例

Analysis on Land Use Change of Small and Medium Sized Cities in Northwest Typical Ecological Fragile Region—A Case Study of Guyuan in Ningxia

以地处西北典型生态脆弱区的宁夏固原市为研究对象,以城市发展历程中3个典型时期的高分辨率卫星影像为信息源,借助GIS和RS技术获取其土地利用数据,从土地利用结构度、变化度、转移度和合理度4个方面展开研究,对2003—2014年研究区土地利用动态演变过程进行定量分析。结果表明:2003—2014年固原市土地利用类型的空间稳定性不断降低,农林与城市建设用地的优势主导地位发生易变;在城市建设用地中,居住用地、绿地与广场用地、公共管理和公共服务用地、道路和交通设施用地是城市主要的用地类型,也是农林用地流转的主要方向;建设用地扩展速度过快导致扩展弹性严重失调,应该引起地方政府警觉。

With Guyuan,Ningxia in northwest typical ecological fragile region as example,high resolution satellite image in three typical periods as data source,using GIS and RS technology to obtain land use data,four aspects including degree of land use structure,change,transfer and reasonable degree were studied,quantitative analysis was conducted on land use dynamic change process during 2003-2014. The results showed that during 2003-2014,spatial stability of land use type continuously reduces,agriculture,forestry and city construction land dominance position is variable in Guyuan; in city construction land,residential land,green space and square land,public administration and public services,roads and traffic facilities are the main types,and also the main direction of agricultural land transfer; construction land expansion over speed lead to serious imbalance in the expansion of flexibility,which should cause alert to local development.