石羊河流域地区城镇空间扩展格局演化

基于石羊河流域地区土地利用综合数据,结合多种模型包括间隙度指数、相关分形维数、扩展强度指数、空间关联模型、空间变差函数,从时间和空间尺度上研究石羊河流域地区城镇建设用地扩展过程与格局。结果表明:20多a来,石羊河流域地区城镇用地以市区和县城为中心向周边辐射,同时沿祁连山边缘海拔2 500 m以下石羊大河沿岸和045丹拉高速、312国道轴线集聚,流域零散分布的乡镇用地变化不大。城镇用地以显著的"点-轴"模式扩展,形成内陆地区城市独特的扩展极核和扩张轴线,为石羊河流域各种规划的编制提供参考。

Urban Spatial Expansion Process and Pattern in Shiyang River Basin

Urban spatial expansion is an inevitable result of regional development.It is important to find out the expansion mechanism so that we can control the region in harmony.Based on the land use data of Shiyang River Basin,combined with a variety of models including lacunarity index,fractal correlation coefficient,expansion intensity index,spatial association measurements and semivarigram,the investigation of the process and pattern of urban spatial expansion from space and time scales was analyzed in the paper.The results showed a urban spatial expansion in Shiyang River Basin in 20 years.And it concentrated along the Shiyang River,Danla Highway 045 and State Road NO.312.There is a little change of township land.It expanded with "point-axis" mode significantly.That becomes the unique expansion of inland cities.And a reference about Shiyang River Basin of various regional planning was provided in the article.