长三角地区多尺度城市网络空间演化及互馈效应研究

基于2003—2018年长三角地区跨国、跨区以及区内企业异地投资数据，融合社会网络分析、面板向量自回归模型和地理加权回归模型等方法，探究长三角地区多尺度城市网络空间演化及其动态互馈效应。结果表明：① 全球、全国和区域尺度城市网络分别处于初步发展、稳步发展和完善发展阶段，各尺度网络均呈现出区域化倾向，以沪宁合杭甬发展廊道为支撑的网络空间结构正在形成。② 城市的全球与全国功能联系之间存在相互促进的关系；城市的区域功能联系提升能够促使其融入全球和全国尺度城市网络，反之，城市的全球与全国功能联系提升却未能促进其进一步融入长三角内部城市网络，融入全球尺度城市网络甚至对城市的区域功能联系产生显著的抑制作用。此外，多尺度城市网络互馈效应具有明显的空间异质性，并与区域经济发展格局相耦合。

Spatial Evolution and Interaction Effects of Multi-scalar Urban Networks in the Yangtze River Delta

Based on the cross-national, cross-regional and regional enterprises’ nonlocal investment data in the Yangtze River Delta (YRD) and applying the social network analysis, panel vector auto regression and geographically weighted regression, this paper reveals the spatial evolution characteristics and interaction effects of the YRD’s multi-scalar urban networks. The results are obtained as follows: Global, national, and regional urban networks in the YRD are in the preliminary, steady, and perfect development stages. Besides, the YRD’s multi-scalar urban networks tend to be regionalized: On a global scale, a dense regional network is gradually forming between the YRD and East Asia, Western Europe, and North America; on a national scale, the connectivity between the YRD and Beijing-Tianjin-Hebei and the Pearl River Delta becomes closer; on a regional scale, there are closer economic ties within the provinces compared with trans-provincial economic ties. Additionally, the network spatial structure dominated by the Shanghai-Nanjing-Hefei-Hangzhou-Ningbo development corridor is forming. When it comes to the interaction effects of the YRD’s multi-scalar urban networks, there is a mutual promotion relationship between the global and national functional connectivity. The improvement of the city’s regional functional connectivity can promote its integration into the global and national urban networks. However, the improvement of the city’s global and national functional connectivity cannot promote its further integration into the YRD’s regional urban network, and its integration into the global urban network even has a significant inhibitory effect on the city’s regional functional connectivity. Furthermore, obvious spatial heterogeneity of interaction effects can be observed, which is coupled with regional economic development patterns.