Polycentricity of Urban Agglom-erations from the Perspective of Spatial Spillover Effects of Population Migration and Functional Specializa-tion
As urban agglomerations(UAs)evolve from a single-center to a multi-center and networked spatial structure,urban population migration and functional specialization can generate different spatial effects at different development stages.Specifically,urban agglomerations have a significant population agglomeration effect in terms of population and functional specialization when they have a single-center spatial structure.The crowding effect appears when the agglomeration effect reaches a certain extent.At this time,the feedback effect of population migration and functional specialization in urban agglomerations is not significant any longer.When urban agglomerations change from a single-center spatial structure to a multi-center one,population migration and functional specialization may produce not only stronger feedback effects but also pronounced spatial spillover effects.Using the cross-sectional data of the Yangtze River Delta and Beijing-Tianjin-Hebei urban agglomerations in 2015,this paper establishes a spatial Simultaneous Equation Model.The empirical analysis shows that with a single-center structure and a low level of development,the Beijing-Tianjin-Hebei urban agglomeration sees an insignificant feedback effect of population migration and functional specializa-tion;the Yangtze River Delta urban agglom-eration,with a multi-center spatial structure,has significant feedback and spillover effects of population migration and functional specialization.
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