长三角地区城市空间相互作用的多维分析

Multidimensional Analysis of Urban Spatial Interaction in the Yangtze River Delta

基于修正的引力模型测度长三角地区41个城市间的空间相互作用,并与夜间灯光数据进行对比,应用标准差椭圆法通过叠加分析识别出中心区域,应用凝聚子群法对区域内部结构进行剖析,结果表明:1)长三角地区城市综合发展质量空间格局呈现“中心—外围”特征,城市体系较完善,但大部分城市空间相互作用有待提升;2)区域内最大引力线主要沿长江流域集聚,北部小范围集聚,南部较分散,空间相互作用总量中江苏省处于领先地位,浙江省提升空间较大;3)区域内城市空间相互作用总量与夜间灯光平均指数呈显著正相关,沿江地带呈现高值集聚状态,且两者叠加的中心区域与《长江三角洲区域一体化发展规划纲要》基本一致;4)长三角地区形成了自东南向西北层次鲜明的子群结构,空间相互作用密度由以上海为中心的子群向南北两端衰减。在此基础上,提出促进长三角地区一体化发展的相关对策建议。

Based on the modified gravity model,the spatial interaction of 41 cities in the Yangtze River Delta is measured,the nighttime light data are compared,the standard deviational ellipse is used for superposition analysis,the central area is identified,and the agglomerative subgroup method is used to analyze the internal structure of the region.It is found as follows.1)The quality of urban comprehensive development in the Yangtze River Delta presents the characteristics of"center-periphery",the urban system is relatively perfect,but most of the urban spatial interaction needs to be improved.2)The maximum gravity lines in the Yangtze River Delta are mainly concentrated along the Yangtze River Basin,concentrated in a small area in the north and scattered in the south.Jiangsu Province is in the leading position in the total amount of spatial interaction,and Zhejiang Province has more room to improve.3)The total amount of urban spatial interaction and the average index of nighttime light in the Yangtze River Delta show a highly aggregated state along the Yangtze River,with significant positive correlation.The central area defined by the superposition analysis of the two is basically consistent with the delimitation scope of the"Yangtze River Delta regional integration development planning outline".4)In the Yangtze River Delta,a distinct subgroup structure has been formed from southeast to northwest,and the spatial interaction density decreases from the subgroup centered on Shanghai to the north and south ends.On this basis,relevant countermeasures and suggestions are put forward to promote the integrated development of the Yangtze River Delta.