Spatio-temporal Distribution Evolution And Influencing Factors Of Logistics Enterprises In Chengdu-Chongqing Economic Circle

Under the background of global economic integration,logistics market in our country presents the situation of becoming increasingly hot.As an indispensable industry in the economic development of urban agglomerations,logistics industry largely determines the operation efficiency and comprehensive competitiveness of urban agglomerations.As the main body of logistics industry,logistics enterprises are the key to promote the healthy development of urban agglomeration.As one of the five major urban agglomerations in Chengdu-Chongqing region,the logistics industry of economic Circle has developed rapidly.But in the overall good development,but also exposed the logistics resources allocation is not reasonable,logistics development is not coordinated and other problems.In this context,this thesis takes the economic circle of Chengdu-Chongqing area as the research object,analyzes the spatial and temporal distribution evolution characteristics and influencing factors of logistics enterprises in the economic circle of Chengdu-Chongqing area.The main research contents and conclusions are as follows:First of all,the data of logistics enterprises in 16 cities of Economic circle in Chengdu-Chongqing area was collected by Eye scan,and the database of logistics enterprises from 2006 to 2020 was established.Buffer zone analysis is used to describe the spatial distribution of logistics enterprises in Chengdu-Chongqing economic circle.Secondly,spatial visualization analysis,average nearest neighbor analysis,kernel density analysis,standard deviation ellipse analysis and gravity center model are used to explore the spatial and temporal evolution characteristics of logistics enterprises distribution in Chengdu-Chongqing economic circle during 2006-2020.Logistics enterprises are classified by function and scale,and the heterogeneity of spatial and temporal distribution evolution of logistics enterprises with different functions and different scales is compared.Finally,per capita GDP,the proportion of added value of the tertiary industry in GDP,Internet broadband access users,the number of industrial enterprises above designated size,the total volume of post and telecommunications services,and the turnover of highway goods are selected as the influencing factors.Support vector regression(SVR)and genetic algorithm(GA)are used to study the factors affecting the temporal and spatial distribution of logistics enterprises in Chengdu-Chongqing economic circle.The results show that:From 2006 to 2020,logistics enterprises in economic circle in Chengdu-Chongqing area showed a rapid growth trend,mainly distributed in the buffer zone of 5km away from the traffic network.The distribution pattern of logistics enterprises is "collapse in the middle",Chengdu and Chongqing logistics has been in the highest scale;The degree of spatial agglomeration of logistics enterprises is increasing,and the distribution shows a trend of "northwest to southeast".The overall development of logistics enterprises in western region is better than that in eastern region.The spatial and temporal evolution characteristics of logistics enterprises with different functions and different scales are different,but the agglomeration centers is gradually increasing,and the radiation range is gradually expanding.Chengdu-Chongqing has always been the high density agglomeration area of logistics enterprises’ spatial and temporal distribution.From the driving factors,the number of logistics enterprises increases with the increase of variables;Each variable has more and more influence on logistics enterprises,among which the economic development level has the greatest influence,followed by the urban development level,and the logistics scale has the least influence.The conclusions of this thesis can provide reference for the development of logistics enterprises in urban agglomerations and the optimization of industrial structure layout.