环渤海地区城市密集区的空间识别与集聚特征

在探讨城市密集区内涵和特征的基础上,以环渤海地区118个城市为研究区域,通过空间识别确定了6个城市密集区范围;利用城市GDP和人口数据,借助Theil系数、城市基尼系数和首位城市集聚度等方法,从空间差异、集聚程度和集聚效应三方面对城市密集区的集聚特征进行探究。结果显示:(1)以城市等级和社会经济数据为筛选标准确定了北京、天津等7个中心城市、38个标准市和77个其他城市;(2)以2 h通行时间确定了以京津、石家庄、沈阳、大连、济南和青岛为核心的城市密集区范围;(3)Theil系数表明环渤海地区整体差异较小,其中城市密集区区内差异大于区际,内部差异对整体差异的贡献率超过91%;(4)集聚类型划分中,京津地区属于强单中心,沈阳、大连和青岛地区属于弱单中心,济南和石家庄地区被归入弱多中心类型;(5)京津城市密集区强大的集聚效应破坏了"石家庄—黄骅"的双核结构链,重新构建了区域的经济结构格局。

The Spatial Identification and Clustering Characteristics of Urban Concentrated Areas in the Bohai Rim Region

Based on the discussion of the connotation and characteristics of urban concentrated areas,take the 118 cities in Bohai rim region as the research area, 6 urban concentrated areas were confirmed by the identification and utilization of city space;With the help of GDP and population data, Theil coefficient, Gini coefficient and the first city agglomeration method, the feature of urban concentrated areas were researched from the spatial difference, the degree of agglomeration and agglomeration effects.The results showed:( 1) The paper identified 7 central cities, 38 standard cities and 77 other cities by city level and social economic data for screening standard; ( 2 ) With the passage of time 2 hours to determine the Beijing and Tianjin, Shijiazhuang, Shenyang, Dalian, Jinan and Qingdao as the core city of urban concentrated areas;(3)Theil coefficient indicates that the overall difference of the Bohai rim region was small, the difference within the urban concentrated area is bigger than the inter regional differences, of the overall difference,the internal difference’s contribution rate is more than 91%;(4)The cluster classification indicates that, Beijing-Tianjin area belongs to the strong single center, Shenyang, Dalian and Qingdao area belongs to the weak single center, Jinan and the Shijiazhuang area belongs to the weak multi-single center;(5)Under the strong agglomeration effects of the Beijing-Tianjin urban concentrated areas, the “Shijiazhuang-Huanghua”dual core structure chain is destroyed, and urban concentrated areas construct the pattern of regional economic structure again.