基于同城化与产业同构效应的城市层级体系研究——以长三角城市群为例

长三角城市群作为国内最大的城市综合体,随着交通基础设施的对接和区域信息一体化水平的提高,其内部城市间的同城化效应逐步增强,城市体系结构和产业结构也随之发生演变,目前已形成以上海为中心,南京、杭州为次中心的城市层级体系,并存在产业同构现象.文章通过因子分析法计算同城化指数,且利用经验数据分析了在多中心城市体系中的中心城市与外围城市之间的结构关系.此外,为了考察城市的初始禀赋对自身经济活动的长期影响,采用截面OLS回归的方法,并选取2006年和2012年的数据观察城市体系结构的变化.回归结果显示,长三角城市体系的中心外围结构在特定条件下显著,并通过比较发现2012年次级中心城市尤其是南京市对其外围城市的影响相对较大,同城化水平在提高的同时增加了产业相似度,且验证了城市体系的空间结构受到行政壁垒影响的假设.

Research on hierarchical urban system based on the effect of urban integration and industrial isomorphism: A case study of urban agglomeration of the Yangtze Delta region

The urban system of the Yangtze Delta region is the largest urban complex in China. With the infrastructure connected and improving level of information integration, the effect of urban integration of internal cities is strengthening and the change of urban architecture and industrial isomorphism phenomenon will occur. At present, the hierarchical urban system of the Yangtze Delta is that Shanghai is the center, while Nanjing and Hangzhou are sub-centers. The authors calculate urban integration index through factor analysis and analyze the structure of relationship in the polycentric urban system between centers and peripheral cities through empirical data. In addition, to consider the long-term impact of initial endowment on economic activities on their own, cross-sectional OLS regression is adopted in this paper. To compare the changes in urban architecture, 2006 and 2012 data are selected in this paper respectively. The regression result indicates that the core-periphery structure of the urban system of the Yangtze Delta is significant in particular situation. By comparison, the radiation effect of secondary urban centers especially Nanjing is strengthening, and the improvement of urban integration increases the similarity of the industry and then testifies the hypothesis that the spatial structure of cities is affected by administrative barrier simultaneously.