基于Kernel密度解释的江苏省城市规模结构演化研究

城市规模结构研究可以反映城市在不同规模等级中的分布状况及城市人口集聚或分散程度,有助于认识城市体系发展所处的阶段以及该区域城市化进程的特征。研究运用Kernel城市空间密度分析方法,直观的反映了江苏省城市规模分布格局的连续变化。分别从城市体系的空间格局、城镇密集带的结构变化和长三角城市群城镇网络构建等视角对城市规模结构进行探讨,指出全省城市规模空间分布的Kernel密度在整体上具有西高东低、南密北疏的态势;城市体系的空间模式由最初的核心-边缘结构,逐渐向点-轴-面结构演化;南京都市圈的进一步延伸,将促进长三角多核心巨型城市网络向更大地域范围拓展。由此提出全省在不断优化城市体系的同时,需要更加注重大中城市及小城镇协调发展机制的建设,加强对苏中、苏北地区城市人口规模的扩张和城市规模布局的均衡,建立具备完整城市功能的网络城市发展模式,以更好的促进区域一体化发展。

STUDY OF URBAN RANK-SIZE HIERARCHY EVOLUTION IN JIANGSU PROVINCE BASED ON KERNEL DENSITY INTERPRETATION

Research on urban rank-size hierarchy is supposed to display city distribution in different scales and assemblage levels of urban population. Previous studies have demonstrated that the substance of evolution on urban rank-size hierarchy could be considered as a dynamic procedure, in which city-size keeps expansion and getting together at first place, then transfers to distribution. Following the conclusion of previous results, this research attempts to introduce Kernel analysis, which is a method used more frequently in studies of spatial distribution into urban density calculation. With the method of Kernel analysis on urban density, research expects to display the continuous change trends of city-size distribution pattern more directly and visually, which could provide some new scope for urban rank-size hierarchy research, and come to a conclusion led by some kind of different points. It is concluded that, firstly, Kernel density of urban distribution in western area is much higher than the east part, while southern area is thicker than the north part, which highly keeps in step with the current situation of economic development over the whole province. Secondly, space pattern of urban system turns from core-periphery structure at the initial time of the evolution into pole-axis-cluster structure gradually. Thirdly, further extrude of Nanjing Metropolitan Circle would promote larger scale exploration of giant cyber city with multi-core in Yangtze River Delta, which would play a more significant role in the Yangtze River Delta Area. Finally, in order to promote regional integration development in Jiangsu Province, development modes of urban network with complete functions should be constructed, which sets an even higher demand on urbanization development in Jiangsu Province.