长江经济带三大城市群之间及其内部城市间连通性

Connectivity of China’s Three Urban Agglomerations and Their Inner Cities in the Yangtze River Economic Belt

基于我国长江经济带东、中、西部有代表性的长江三角洲城市群、长江中游城市群和成渝城市群2013—2018年的GDP、人口、建成区面积、城市行政等级等数据,运用修正的四维引力模型、社会网络分析和城市流强度等方法,对国内大循环背景下三大城市群内部及之间的连通性进行分析。研究发现:从整体上看,2013—2018年三大城市群内部的经济联系程度都呈上升趋势,城市群内部的连通性趋于均衡化与网络化。其中,上海、武汉、成都等分别是长江三角洲城市群、长江中游城市群和成渝城市群的强经济联系城市。同时,由于区位优势等原因,长江三角洲城市群的城市流强度等指标数值比中西部城市群高,表明其综合对外服务能力与对周边地区的辐射带动作用更强。而成渝和长江中游城市群之间的连通性较弱,导致区域发展不均衡,阻碍国内大循环的通畅运行。

Based on the data of GDP,population,built-up area,and urban administrative level and other data of three urban agglomerations in the Yangtze River Delta,the middle reaches of Yangtze River and Chengdu-Chongqing in 2013-2018which are the representative urban agglomerations in the eastern,middle and western Yangtze River Economic Belt,this paper analyzes the connectivity within and between three urban agglomerations under the background of domestic large circulation using the modified four-dimensional gravity model,social network analysis and urban flow intensity.The results show that:On the whole,the economic links within three urban agglomerations show an upward trend from 2013to 2018.The connectivity within three urban agglomerations tends to be balanced and networked.Among them,Shanghai,Wuhan,Chengdu are the cities with strong economic links in three urban agglomerations.At the same time,due to location advantages and other reasons,the urban flow intensity and other indicators of the Yangtze River Delta urban agglomeration are higher than that of the central and western urban agglomerations,indicating that its comprehensive external service ability and radiation and driving effect on the surrounding areas are strong.However,the connectivity between urban agglomerations in the Chengdu-Chongqing and the middle reaches of Yangtze River is weak,which leads to uneven regional development and hinders the smooth operation of the domestic big circulation.