摘要
城市中心性既体现在城市的等级位序,亦表现为城市在网络体系中的节点连通性以及节点之间的"流"强度。将区域城市等级体系和关系网络研究相结合,是城市体系理论与实践研究可探索的方向。以泛长江三角洲52个城市为研究对象,通过中心城市指数表征城市的等级中心性,企业网络联系测度城市的网络中心性,结合城市的等级中心性和网络中心性特征进行中心城市评价。将泛长江三角洲地区中心城市划分为了5个等级和7种类型,分别是:1个全球城市:上海;3个国家中心城市:杭州、南京、苏州;温州等6个区域等级中心城市;宁波等8个区域网络枢纽城市;盐城等8个地区等级中心城市;淮北等6个地区网络枢纽城市以及19个地方一般城市。基于对中心城市的类型划分,可进一步研究提出针对不同类型城市的分类引导政策。通过提升基础设施连通度、延伸产业链等措施来提升等级中心性较高城市的系统开放性;通过强化要素资源集聚,提高城市服务水平等促进关系网络枢纽城市的等级水平。
The centrality of a city can be defined as several parameters such as its rank-size rule,the node connectivity in the network system,and the flow intensity of different network nodes. A combined study of the hierarchy structure of regional cities and their connected network is widely regarded as a feasible direction that remains to be explored in the field of the urban system theoretically and practically. 52 cities in the region of Yangtze River Delta were study subjects in this paper. Firstly,a pyramid structure can be found in the hierarchy system of cities through the establishment of a center city index which was used to measure the centrality of cities in the study. Meanwhile, the distribution of different hierarchy cities suggests a spatial trend for ＂circle development plus axis extension ＂in this area. Secondly,an analysis of the urban network system in Yangtze River region was conducted through dissecting the associative network of listed companies. As the result implied,a shifting from the traditional ＂Z＂-shape to a ＂π＂-shape was emerging in the distribution of cities with dominant positions in centrality. Also, a cross-administrative connection, along with a neighboring effect have both contributed to the formation of the current network system of cities. Therefore,the hierarchy system coexists with the connection network,together forming the two urban systems in the context of multiple organization modes of economic activities in cities. Based on a framework of hierarchy system-network analysis,this paper presented distinctive urban character through studying the synthetic relation combine the centrality of city hierarchy and nodality of city network of each city. Hence,the hierarchy and classification of major cities in this region have been achieved. Cities have been divided into 5 ranks and 7 types,including： one global city-Shanghai; three national cities-Hangzhou,Nanjing,Suzhou; six major cities in provincial level-Wenzhou and other five; eight network pivots in provincial level-Ningbo and other seven; eight major cities in sub-regional level-Yancheng and other seven; six network pivots in sub-regional level-Huaibei and other five; and other nineteen local cities. A further study on the guiding policy of cities＇ classification in accordance with their types can be conducted in the future on the basis of the dividing method adopted in this paper. Several factors can be taken into consideration in such policy,including to improve the systematic openness of cities with relatively high centrality by promoting their infrastructure connectivity,extending the industrial chains and etc; as well as to advance the rank of network pivots by intensifying the resource agglomeration effects,and improving their services.
作者
李玏
顾朝林
LI Le;GU Chao-lin(School of Architecture, Tsinghua University, Beijing 100084, China)
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2018年第5期949-959,共11页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金重大项目(41590844)
清华大学自主科研计划项目(2015THZ01)
关键词
中心城市
等级体系
关系网络
泛长江三角洲
central city
hierarchy structure
city network
Yangtze River Delta Region
