功能分工、经济集聚空间溢出视角下城市群多中心性研究

Polycentricity of urban agglomerations from the perspective of spatial spillover effects of functional urban specialization and economic agglomeration

伴随城市群空间结构由单中心向多中心、网络化转变,其功能分工与经济集聚会呈现出不同的空间效应。具体而言,当城市群处于单中心空间结构时,功能分工与经济集聚的极化效应显著;当城市群为多中心空间结构时,功能分工与经济集聚的空间溢出效应显著。利用2015年长三角、京津冀、珠三角城市群的截面数据,建立空间联立方程模型,通过实证分析认为,京津冀城市群为单中心发展模式,发育水平较低;珠三角城市群处于单中心向多中心模式的过渡阶段,发育水平较高;长三角城市群为多中心发展模式,发育最为成熟。从城市群一体化发展角度来看,应促进城市群内城市之间的功能分工,进而推动城市群内部城市之间的协同发展。

As Urban Agglomerations(UAs)evolve,functional urban specialization and economic agglomeration can generate different spatial spillover effects at different stages of development.Specially,functional urban specialization and economic agglomeration may produce not only stronger local agglomeration effects,but also more pronounced spatial spillover effects.This paper selected the major UAs in China,Yangtze-River Delta,Beijing-Tianjin-Hebei and Pearl-River Delta,as the samplesof analysis.Using county-level data in the year of 2015,we built simultaneous equation models to explore the spatial effects of migration and economic growth.Our results found consistent and positive spillover effects of migration across the three UAs in China.Moreover,as the development level of the UAs changes to be higher,the spatial links tend to be stronger,the positive spillover effect of economic agglomeration on the nearby areas’economy becomes more salient,and the spatial interdependencies between functional urban specialization and economic agglomeration tend to be more competitive.