| During the "14th Five-Year Plan" period,China’s logistics flow is undergoing a transformation from the external circulation of single-ring flow to the two-way flow of internal circulation-external circulation,which puts forward new requirements and challenges for the layout of logistics channels and hubs.As an important carrier of logistics activities,logistics enterprises are an important force to promote urban economic and spatial development,and strengthening the research on the spatial pattern of logistics enterprises is conducive to promoting the rapid development of the logistics industry.As a major strategic development area in the new era,the Yangtze River Economic Belt is an important engine of China’s economic development.Based on this,this paper uses the panel data of A-level logistics enterprises in the Yangtze River Economic Belt from 2005 to 2020,uses the spatial comprehensive analysis method to empirically study the temporal and spatial evolution characteristics of logistics storage land and logistics enterprises in the Yangtze River Economic Belt,explores the relative influence size and interaction intensity of the influencing factors of the spatial distribution of logistics enterprises combined with geographic detectors,and proposes an optimization path for the spatial layout of logistics enterprises.The main conclusions are as follows:Second,the temporal and spatial evolution characteristics of logistics enterprises in the Yangtze River Economic Belt: analyzed from the perspectives of logistics land spread and logistics enterprise agglomeration.(1)Evolution characteristics and regional differences of logistics sprawl:(1)Logistics sprawl occurs in most cities in the Yangtze River Economic Belt,and in the T1～T2 stage,the degree of logistics sprawl in cities in the Yangtze River Economic Belt shows a high to low evolution process.(2)Characteristics of the temporal and spatial evolution of logistics enterprises:(1)The eastern provinces have the strongest degree of agglomeration,and all show a significant agglomeration state;The central provinces followed,with a state of random distribution;The western provinces are the weakest,with two discrete patterns and one random distribution.(2)The spatial distribution pattern of logistics enterprises in different periods showed a sparse upstream,a tight midstream,and a dense distribution trend downstream,all showing the direction of "east by north",and the direction of the center of gravity shifted significantly to the west.The directional distribution of provinces and cities is divided into three distribution types,including "southeast-northwest" type,"northeast-southwest" type and direction inconspicuous type.(3)Within different spatial scales,the Ripley’s K function of logistics enterprises in various provinces and cities in the Yangtze River Economic Belt showed the "inverted" characteristics of rapid growth and then slow decrease,and the spatial agglomeration intensity first rose to the maximum agglomeration scale and then slowly decreased.(4)Hot spot agglomeration areas are mainly concentrated in three areas: coastal riverside cities,inland transportation hub cities and provincial capitals.Second,this study examines the temporal and spatial evolution characteristics of logistics enterprises in the Yangtze River Economic Belt,focusing on logistics land expansion and logistics enterprise clustering.(1)Evolution characteristics and regional differences of logistics sprawl:(1)Logistics sprawl occurs in most cities in the Yangtze River Economic Belt,and in the T1～T2 stage,the logistics sprawl of cities in the Yangtze River Economic Belt shows a high to low evolution process.(2)Hot spot analysis shows that the distribution pattern of "hot in the west and cold in the east" is presented,and the urban logistics sprawl in the lower reaches of the Yangtze River is lower than that in the upper reaches of the Yangtze River.(3)The coefficient of variation indicates that the degree of logistics sprawl in downstream and non-provincial capital cities is reduced,the degree of logistics sprawl in midstream cities and provincial capitals is increasing but does not change much,and it is in a controllable range,and the logistics spread in upstream areas is relatively serious and needs to be treated as soon as possible.(2)Temporal and spatial evolution characteristics of logistics enterprise agglomeration:(1)The eastern provinces have the strongest degree of agglomeration,and all show a significant agglomeration state;The central provinces followed,with a state of random distribution;The western provinces are the weakest,with two discrete patterns and one random distribution.(2)The spatial distribution pattern of logistics enterprises in the three years showed a sparse upstream,a tight midstream,and a dense distribution trend downstream,all showing the direction of "east-north",and the direction of the center of gravity shifted significantly to the west.The directional distribution of provinces and cities is divided into three distribution types,including "southeast-northwest" type,"northeast-southwest" type and direction inconspicuous type.(3)Within different spatial scales,the Ripley’s K function of logistics enterprises in the Yangtze River Economic Belt as a whole showed the "barb" characteristic of rapid growth and then slow decrease,and logistics enterprises of all levels had significant spatial agglomeration characteristics,and the spatial agglomeration intensity first rose to the maximum agglomeration scale and then slowly decreased.(4)Hot spot agglomeration areas are mainly concentrated in three areas: coastal riverside cities,inland transportation hub cities and provincial capitals.Third,the detection of influencing factors of spatial differentiation of logistics enterprises in the Yangtze River Economic Belt.(1)Correlation analysis results: All correlation coefficients are greater than 0,indicating positive correlation.In addition,all detection factors except for the 2015 traffic capacity detection factor passed the significance test,which further proves that the selected impact factor is reasonable.(2)Factor detection results: the main influencing factors in different periods are not the same,the level of economic development,commercial development and urban road construction have been in a strong influencing intensity,the strength of the main influencing factors has gradually weakened,the strength of the weaker influencing factors has gradually increased,and the difference between the q values of most influencing factors has gradually decreased,indicating that the spatial pattern of A-grade logistics enterprises in the Yangtze River Economic Belt is jointly affected by multiple influencing factors,and at the same time develops in the direction of equilibrium.(3)Interaction detection results: The bivariate enhancement of all risk factors showed two-factor enhancement,and the interaction intensity generally decreased over time,the difference between the maximum and minimum Q values gradually decreased,and the interaction intensity gradually tended to be equalized.Fourth,countermeasures and suggestions to optimize the spatial layout of logistics enterprises in the Yangtze River Economic Belt.According to the analysis results of Chapters 4 and 5,corresponding suggestions are put forward from the two aspects of "deeply grasping the ’growth pole’,coordinated development to promote balance" and "actively promoting the ’source power’,and making overall planning to add vitality",so as to achieve the balanced development of the Yangtze River Economic Belt. |
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