Analysis Of Spatial And Temporal Evolution Characteristics And Influencing Factors Of Domestic Air Cargo Network

With the rapid development of the domestic air cargo industry,the air cargo and mail transportation between cities shows a continuous growth,and the spatial and temporal complexity of the domestic air cargo network continues to emerge.And in recent years,China’s macro policy strongly supports the development of the central and western regions,the phenomenon that the growth rate of air cargo development in the central and western regions exceeds that of the eastern regions.Meanwhile,influenced by the New Crown Pneumonia epidemic,the domestic air cargo network has also seen large changes during the New Crown Pneumonia epidemic.Therefore,it is important to study the spatial and temporal evolution of the domestic air cargo network.Based on this,this paper constructs a domestic air cargo network from 2014 to 2021 with the weight of air cargo and mail traffic between city nodes,and uses a combination of social network analysis and Arc GIS geospatial analysis methods to specifically analyze the spatial and temporal complexity and geospatial characteristics of the domestic air cargo network.Meanwhile,panel data regression and QAP analysis methods are used to analyze the influencing factors of the domestic air cargo network and explore the driving mechanisms of the evolution of the domestic air cargo network.The findings of the study are as follows:First,from the node characteristics,Beijing and Shanghai have a decreasing trend of node importance in the network,and the node importance of regional hubs such as Guangzhou,Shenzhen,Hangzhou and Chengdu has increased.And important nodes are mainly concentrated in the eastern and western regions.In terms of overall characteristics,the domestic air cargo network has a "core-edge" structure,with the core zone mainly consisting of nodes in the eastern and western cities;the Newcastle pneumonia epidemic had a great impact on the topology of the first linked air cargo flow network,with nodes in Beijing and Shanghai having The first and second levels of domestic air cargo transport links form an obvious core framework of diamond-shaped structure,and the eastern region is the most concentrated area of domestic air cargo links;the geographic spatial aggregation of the association structure of domestic air cargo network is not strong,and the matching with the administrative geographic boundaries of China is relatively weak.Second,in terms of node characteristics,gross city product and city air passenger throughput have significant positive effects on connectivity,air cargo and mail transportation intensity,accessibility and intermediation capacity of city nodes.Geographical distribution has a smaller effect on connectivity and accessibility,and a larger effect on air cargo and mail transportation intensity and intermediation capacity.In terms of overall characteristics,gross product,administrative rank and geospatial distance have a positive contribution to air cargo and mail traffic between cities.City passenger throughput had a significant positive contribution to inter-city air cargo traffic before the epidemic,but under the influence of the New Crown Pneumonia epidemic,city air passenger throughput no longer has a significant effect on inter-city air cargo traffic in 2020 and 2021.