The Evolution And Influencing Factors Of County Economic Connection Network In Chengdu Plain Economic Zone

With the continuous and sound development of the modern economic system,the intensity,breadth and depth of the flow of economic elements are constantly strengthened,the economic links between regions are becoming closer and closer,the interaction is becoming more and more frequent,and the flattening and networking trend of regional economic development is becoming more and more obvious..In this context,experts and scholars pay special attention to the characteristics and evolution of regional economic networks.With the development space of big cities and the carrying capacity of resources gradually breaking through the upper limit,it is inevitable to explore the economic development center of gravity,showing the pattern that the prefecture-level cities transfer some urban functions to the surrounding areas at the provincial scale,and the central urban areas develop together with the surrounding counties.As the basic unit of implementing the national economic development strategy and policy,the county economy is not only the cornerstone of regional economic development,but also the important link node of regional economic network development.Therefore,it has become an important research direction to study regional development on the scale of county economy.This thesis takes 68 counties of Chengdu plain economic zone as the research unit,adopts the modified gravity model,measures the economic connection strength,constructs the economic connection network,uses the ArcGis software to visualize the economic connection network pattern,and combines the social network analysis method to study the structural characteristics,evolution process and influencing factors of the economic connection network of Chengdu plain economic zone in 2007,2012 and 2017.The aim is to provide some reference and basis for the coordinated development and pattern optimization of Chengdu Plain Economic Zone.The research results show that:(1)The network of economic contacts shows the characteristic of "one city alone ".The economic radiation and attraction ability of the central city of Chengdu is further expanded,which plays the role of regional growth pole and has a strong influence on the whole region.The economic network structure of the whole Chengdu Plain Economic Zone presents a super center and radiates the influence around it.(2)The spatial distribution of economic links varies greatly,and the trend of multi-center co-development begins to take shape.The degree of economic connection between the counties in the economic zone is still quite different,and the degree of economic connection between other regions far away from Chengdu is not high,so there is still a large room for improvement on the whole.The effect of Chengdemian integration process is obvious,at the same time,the agglomeration and radiation intensity of Suining and Meishan to the surrounding areas are significantly enhanced.The whole network has begun to change from the single-core agglomeration stage to the parallel development of agglomeration and diffusion.This trend has taken place and will be further strengthened in the future.It can be expected to form a spatial structure with Chengdu as the central economic development core and Suining and Meishan as the secondary core of economic development in the east and southwest in the future.(3)The economic link network presents a "small group" structure with distinct proximity-pointing features.Through the analysis of the condensed subgroups of th e economic connection network,the economic zone of Chengdu plain can be divid ed into four subgroups on the three time sections,and the members of the subgrou ps will be adjusted somewhat with the change of time.The economic relation betw een the four condensed subgroups is very different.The results show that the count y economic connection network of Chengdu Plain Economic Zone forms four sub-g roups with layers from northeast to southwest,and each county is composed of De yang-Mianyang-Sui Ning sub-group(sub-group 2),Chengdu-Dueyang-Ziyang sub-gro up(sub-group 1),Chengdu-Ya'an sub-group(sub-group 3)and Leshan-Mei Shan sub-group(sub-group 4).At the same time,the results of the analysis of condensed subgroups in Chengdu plain economic zone are consistent with the geographical loc ation of each district,county and city,and the subgroups are divided into distinct adjacent points.(4)A variety of factors contribute to the evolution of economic link networks.The evolution of economic network is influenced by the level of urbanization construction,location conditions,industrial structure,resource agglomeration and diffusion capacity.The four influencing factors of geographical proximity,urbanization rate,tertiary industry proportion and fixed assets investment were positively correlated with economic connection intensity.The proximity of geographical location has a very important influence on the evolution of the economic connection network,and the other three factors have a significant positive effect on the evolution of the economic connection network.Through research and analysis,based on the problems existing in the county economic connection network of Chengdu Plain Economic Zone,this paper puts forward some suggestions to optimize the county economic connection network of Chengdu Plain Economic Zone to promote the coordinated development of Chengdu Plain Economic Zone.