长江中游城市群铁路可达性及经济联系空间格局演变

Spatial Pattern Evolution of Rail Accessibility and Economic Co nnections in the Urban Agglomeration in the Middle Reaches of the Yangtze River

采用可达性水平评价、经济联系分析、块模型等方法,研究了2009、2018年长江中游城市群的铁路可达性和经济联系空间格局,结果显示:从2009到2018年,长江中游城市群的铁路可达性改善明显,城市通达度提升,中心城市日常可达性范围扩大,尤其是1 h经济圈扩张明显,各城市的加权平均旅行时间显著降低,呈现“核心-边缘”格局,但差异增大;长江中游城市群形成以武汉、长沙、南昌为核心的放射状经济联系空间格局,且武汉、长沙的中心作用较南昌更明显,主要高铁沿线形成较高水平的经济联系带,剩余绝大多数城市间经济联系水平较低;长江中游城市群可划分为4个凝聚子群,其中环长株潭子群、武汉城市圈子群内部经济联系较强,4个子群内部联系显著高于相互联系,区域网络化格局尚未形成。

Accessibility evaluation,economic connection analysis,block modeling are used to evaluate the spatial pattern evolution of rail accessibility and economic connections in the urban agglomeration in the Middle Reaches of the Yangtze River in 2009 and 2018.Results show:From 2009 to 2018,the railway accessibility of the urban agglomeration in the Middle Reaches of the Yangtze River has improved significantly,direct train cities have increased,and the daily accessibility of central cities has expanded,especially the 1h economic circle,and the weighted average travel time of each city has been significantly reduced,showing a“core-periphery”pattern,but the difference has been strengthened.The urban agglomeration in the middle reaches of the Yangtze River form a spatial pattern of radial economic connections with Wuhan,Changsha,and Nanchang as the core,and the central role of Wuhan and Changsha is more obvious than that of Nanchang.The main high-speed rail lines form a higher level of economic ties,and most of the remaining cities are in low economic connection.The urban agglomeration in the middle reaches of the Yangtze River can be divided into four sub-groups.The economic connection of cities in urban agglomeration around Changsha-Zhuzhou-Xiangtan and Wuhan metropolitan circles are stronger than that in urban agglomeration around the Poyang Lake and in western Hubei.The internal connection of the four subgroups is significantly higher than the mutual connection,which suggests that the regional network pattern has not yet formed.