酒嘉地区中心城区扩张的时空格局演化研究

Evolution of Integrated Expansion in Central Area of Jiuquan and Jiayuguan Region

基于统计数据和酒(泉)嘉(峪关)地区1987—2013年5个时相卫星遥感数据,采用空间关联、网格分割等方法分析了酒嘉地区中心城区建设用地空间扩张的集聚特征及时空格局演化过程。研究结果表明:1酒(泉)嘉(峪关)中心城区呈一体化扩张,2000年以前呈背向式扩张,2000年以后呈现出酒泉向西为主,向南为辅,嘉峪关向东为主,向西为辅的相向式扩张,预计未来3—5年两市将自然融合为一体。2酒嘉中心城区建设用地扩张规模变化具有明显的阶段性特征,2000年以后中心城区扩张速度明显高于以前,建设用地扩张强度指数表现出先增后减的特征。3建设用地扩张的热点区从孤立点逐渐轮换、跃迁、延伸、粘合,形成连片趋势发展的团状聚集结构,建设用地扩张高值簇的比重出现了先降后升再降的现象。4酒嘉中心城区扩张具有定向开发、沿交通线轴向发展、从中心向外围扩张、逐河流沿岸和绿洲盆地分布、较多占用戈壁荒草地的特征。

This paper analyzed the agglomeration features of central area construction spatial integrated expansion and the process of space - time pattern evolution in Jiuquan and Jiayuguan Region, based on the methods of spatial correlation and grid division, by statistical data and five phases satellite remote sensing data between 1987 and 2013, and discussed the problems and reasons existing in the integrated expansion. Finally, some conclusions were drawn as follows： （1）Before 2000, Jiujia Region had situation of reversed expansion. 2006 years later, the west was main, and the south was complementary in Jiuquan. The east was main, and the west was complementary in Jiayuguan. Jiuquan and Jiayuguan Region expansion had the situation of relative development. It could be predicted that those two cities would naturally get together in the next 3 to 5 years. （2）There were obvious stage characteristics of construction land expansion size change. From 2000, central area expansion sped significantly higher than before. （3） ＂Hot spots＂ developed from isolated point, alternate, leap, extend and bond gradually. As a result, it was formed a cluster structure of continuous trend. The proportion of high value in construction land expansion fall firstly, then rise and after fall. （4）Jiuquan and Jiayuguan region central area expansion had general rules of directional development, axial direction development along the traffic trend, expanding gradually from the center to the periphery, distribution by the river basin and oasis basin.