长江中游城市群铁路客运联系及其空间格局演变

基于铁路客运交通流数据,借助社会网络分析方法,从外部连通、内部连通两方面分析长江中游城市群铁路客运联系及其空间格局的演变。结果表明:(1)2009年~2015年间,长江中游城市群内武汉、长沙、南昌3大中心城市在对外联系和对内联系方面均呈现"武汉最强,长沙次之,南昌最弱","马太效应"日益显著;(2)武汉、长沙、南昌三市的对外联系主导方向各异,存在明显的空间错位现象;(3)2009年~2015年间长江中游城市群内31个城市的铁路交通地位发生较大变化,武汉、长沙、南昌三市的铁路枢纽地位得到巩固与提升,与其作为三大战略支点的地位逐渐匹配;(4)长江中游城市群铁路客运网络中心化程度较低,集中趋势不明显,表现为较低水平的多中心格局;(5)2009年~2015年间,长江中游城市群铁路客运联系网络空间格局由五边形转变为"品"形,省际毗邻城市之间的联系有待进一步增强;南昌市和环鄱阳湖城市群的铁路网络建设也有待完善,以增强其在"中三角"中的支撑地位。

Evolution of railway passenger traffic linkage and spatial pattern in Yangtze River middle reaches clusters

Yangtze River Middle Reaches clusters, formed by the urban cluster around Wuhan in Hubei Province, the Changsha-Zhuzhou-Xiangtan city group in Hunan Province and the cluster around Poyang Lake in Jiangxi Province, will create a new economic growth engine by promoting urbanization and help address the imbalanced regional development across China. Based on the data of railway passenger traffic flow and with the aid of social network analysis, the evolu-tion of railway passenger traffic linkage and spatial pattern in Yangtze River Middle Reaches clusters has been discussed from external connectivity and in-ternal connectivity two aspects. The results are shown as follows. Firstly, from 2009 to 2015, the intensity of three central cities tends to“Wuhan > Changsha > Nanchang”both in external contact and internal contact, and“Matthew effect”is increasingly significant. Secondly, there is a different predominating direction of external contact among Wuhan, Changsha and Nan-chang, and now it is in an obvious spatial mismatch. Thirdly, great changes have taken place in railway traffic status of 31 cities in Yangtze River Mid-dle Reaches clusters during 2009~2015, for instance, Wuhan, Changsha and Nan-chang, consolidated and upgraded their positions of rail hubs, match with their position of three major strategic pivot gradually. However, the central-ized degree of railway passenger transport network in Yangtze River Middle Reaches clusters is still in a lower level, and centralized tendency is not obvious, thus, Yangtze River Middle Reaches clusters has characterized by a multi-center pattern with a lower level. Finally, during the period between 2009 and 2015, the spatial pattern of railway passenger contact network has changed from the“pentagon”shape to the“品”shape, and contacts among inter-provincial neighboring cities remain to be further strengthened. Furthermore, it’s time for Nanchang and cluster around Poyang Lake to develop their railway network construction to enhance their support function in“triangle”in the central China.