成渝经济区城市群空间结构要素特征分析

The Research on Urban Agglomeration Spatial Structure of Cheng-Yu Economic Zone

将成渝经济区147个区、县级行政区整合为124个研究单元,运用城市中心性、经济联系强度和空间断裂点等模型,分别对2015年成渝经济区城市群空间结构的"点、线、面"要素特征进行刻画,得到成渝经济区城市群空间格局的总体形态。研究发现:1成渝经济区城市群中心城市体系可划分为三级,其中成渝"双核"城市为一级中心城市,绵阳、南充、宜宾、万州等四个城市为二级中心城市,乐山、内江、达州、永川等4个城市为三级中心城市;2成渝经济区城市群形成了"3—7—4"三个等级的空间轴线网络,以3条成渝互通通道为第一等级,7条"双核"对外放射通道为第二等级,4条地市间互通通道为第三等级;3成渝经济区城市群经济腹地范围囊括现有成渝经济区中的117个区、县级行政区,边缘地区的30个区、县未能纳入;4成渝经济区正经历从行政经济向区域经济过渡的关键阶段,成渝城市群是推动成渝经济区发展的重要支撑。

The article concludes 124 integrated units within the scope of Cheng-Yu Economic Zone as research objects, using the econometric models of urban centrality, economic contact intensity and spatial fracture point model to analysis the feature of spatial factors as ＂point, line, plane＂ of Cheng-Yu Economic Zone in 2015, in order to reveal the spatial structure and abstract the whole agglomeration form. The results of the study show that： （1）Cheng-Yu Economic Zone has formed a three-classes urban system, Chengdu and Chongqing as the ＂dual core＂ are the first level, Mianyang, Nanchong, Yibin and Wanzhou are the second level, Leshan, Neijiang, Dazhou, Yongchuan are the third level. （2）Cheng-Yu Economic Zone has formed a three-dimension urban axes system, three axes between Chengdu and Chongqing are the first dimension, seven external radiation channel are the second dimension, and four axes connected townships are the third dimension. （3）The economic hinterland of Cheng-Yu Economic Zone agglomeration includes 117 existing county administrative unit, and 30 counties are excluded. （4）The Cheng-Yu Economic Zone is experiencing an important stage of economic transition from administrative region to economic region, and the agglomeration is becoming an important support to promote the development of Cheng-Yu Economic Zone.