多中心化与城市群经济发展关系研究

城市群成为我国国民经济空间拓展、发展功能转换的重要空间载体，也是新型城镇化进程中的主体形态。城市群空间结构因城市增长的空间异质性而发生动态演化，多中心化发展趋势日渐形成，直接推动系统空间结构演化，影响经济绩效。长三角城市群作为我国城市化发展程度最高的典型区域，已呈现出多中心化发展特征，对城市群系统层级体系演化发挥着显著作用。通过构建多中心性指数，衡量城市在城市群系统中的中心度，并在此基础上考虑空间效应的交互影响，探讨多中心化发展对城市经济增长的作用。结果表明，多中心化发展显著促进长三角城市经济绩效提升，而且首位城市、区域性中心城市发挥着异质性、非线性影响，与其自身发展所处阶段密切相关，具有差异化政策启示。

Study on the Relationship between Polycentric Development and Economic Performance of Urban Agglomeration

The urban agglomeration has become an important space carrier for the expansion and development of the national economic space, as well as the main form in the process of new urbanization. The spatial structure of urban agglomerations has a dynamic evolution based on the spatial heterogeneity of urban growth. The polycentric development trend of urban agglomeration directly promotes the evolution of the spatial structure of the system, and affects the economic performance. As the typical region with the highest degree of urbanization in China, the Yangtze River Delta mega city region has shown the characteristics of polycentric development, and has a significant impact on the hierarchy evolution of the urban agglomeration system. The centrality index is constructed to measure the centrality of the city in the urban agglomeration system. On the basis of this, the interaction of spatial effects is considered, and the effect of polycentric development on urban economic growth is discussed. The empirical results show that polycentric development significantly promote economic performance of city in Yangtze River Delta mega city region, but also the primacy city and the regional central cities play the heterogeneity and nonlinearity effect because of respective stages of economic development, which lead to the difference of the policy implications.