鄱阳湖生态经济区城镇体系空间结构演变

Evolution of Urban-system Spatial Structure in Poyang Lake Ecological Economic Zone

合理有序的空间结构可以助推区域实现空间效益最大化。借助GIS空间分析技术,采用"自下而上"的城市等级及腹地划分方法以及社会网络分析方法,从城市等级、腹地、网络3个角度对鄱阳湖生态经济区城镇体系空间结构演变特征进行研究。结果表明:鄱阳湖生态经济区城镇体系等级结构特征明显;南昌、九江周边区域空间邻近效应显著;城镇网络的"核心-边缘"结构特征趋向明显;南昌市对东部区域辐射能力持续偏弱;城市等级划分出现中心城市等级与行政级别"错位耦合"的现象;城市腹地划分"边界效应"明显。

The spatial structure that is reasonable and well-organized can boost regions achieve the maximum spatial benefit. With the help of the spatial analysis technology offering by GIS,meanwhile using the social network analysis method and the ＂bottom-up＂method to divide the city level and hinterland,this article studies the evolutional characteristics of urban-system spatial structure in Poyang Lake Ecological Economic Zone from the viewpoints of city level,the hinterland and the network. The results show that the urban system has a characteristic with obvious grade,and the spatial proximity effect of Nanchang and Jiujiang is significant. Besides,the urban network tends to be a character of ＂core-edge＂structure,especially,the radiation ability of Nanchang City to its eastern region is weak continuously. Therefore,the phenomenon of ＂malposition coupling＂emerges between the grade of central cities and administrational level when dividing the urban hierarchies,at the same time,the ＂boundary effect＂appears distinctly when dividing the urban hinterland.