长三角城市群网络特征与省际边界效应——基于人口流动视角

Study of network characteristics and inter-provincial boundary effect of the Yangtze River Delta urban agglomeration:From the perspective of population flow

构建城市网络化与消除行政边界所导致的阻隔效应是城市群一体化过程中所面临的双重问题。网络视角下,行政边界呈现出何种程度的空间效应是揭示区域演化机制的科学问题。基于人口流动要素构建长三角城市群网络,定量识别城市网络中的省际边界效应问题。研究指出:①网络密度、平均中心性和平均控制力三项指标一致表明基于人口流动的长三角城市群网络呈现出强联结状态;②经济规模、政治资源、产业结构、历史基础、就业机会和劳动收益是人口流动网络形成的重要影响因素,而省际边界、跨界频数、时间距离是人口流动网络流向的关键引导因素;③基于二次指派程序(QAP)的人口流动影响因素和网络拓扑结构分析共同表明,长三角城市群网络中存在显著的边界效应,且人口流动网络中边界效应表现出明显差异。省际边界在长三角城市群人口流动网络中发挥了融合(沪苏边界上海-苏州段)、过滤(沪浙边界上海-嘉兴段等)、接触(浙皖边界湖州-宣城段等)、阻隔(苏皖边界常州-宣城段等)四种不同的空间效应。论文对于深入理解城市群一体化驱动机制具有理论和现实意义。

Construction of urban network and the barrier effect(caused by the elimination of administrative borders)are problems in the integration of urban agglomeration.From the perspective of network,the extent of spatial effect indicated by administrative borders reveals the mechanism of regional evolution.This study developed the Yangtze River Delta urban agglomeration network based on the population flow elements,and also quantitatively identified the problems of inter-provincial boundary effects in the urban network.The results showed that:(1)Network density,average centrality,and average control force indicate that the Yangtze River Delta urban agglomeration network shows a strong connection,based on the population flow.(2)Economic situation,political resources,industrial structure,historical basis,employment opportunities,and labor gains are important influencing factors in the formation of a population flow network,while inter-provincial border,cross-border frequency,and temporal distance are key guiding factors of the flow direction of the population flow networks.This conclusion also just proves that the traditional elements group is not able to fully explain the formation and development mechanism of urban network under the background of elements flow efficiently.(3)The analysis of influencing factors of population flow,based on the quadratic assignment procedure(QAP)and network topological structure,showed a significant boundary effect in the Yangtze River Delta urban agglomeration network.Furthermore,the boundary effect of population flow network showed obvious differences.The provincial boundary considers four spatial effects in the Yangtze River Delta urban agglomeration network,including:integration(the Shanghai-Suzhou section on the border between Shanghai and Jiangsu),filtration(e.g.the Shanghai-Jiaxing section on the border between Shanghai and Zhejiang),contact(e.g.the Huzhou-Xuancheng section on the border between Zhejiang and Anhui),and barrier(e.g.the Changzhou-Xuancheng section on the border between Jiangsu and Anhui).This study has theoretical and practical significance for further understanding of the driving mechanisms of urban agglomeration integration.