Using GeoDetector To Determine The Factors Affecting Evolution Of The Structure Of Information Flow In The Middle Reaches Of The Yangtze River

With the development of the Internet and the coverage of information networks,there is a large amount of information flowing between cities,and the connection between cities becomes more convenient,fast and complicated.The flow of information between cities breaks the hierarchical system and spatial distribution of the urban agglomeration(MYUA),reshapes the spatial structure of MYUA,and provides new impetus for the development of MYUA.With the implementation of the national "The rise of Central China" and "The Belt and Road" strategies,the middle reaches of the Yangtze River(MRYR)are expected to become the country's new core growth pole.In recent years,the MYUA in the MRYR has developed most rapidly,and it is a region where the information flow space has evolved drastically.On the one hand,exploring the spatial evolution of information flow in the MRYR and its influencing factors is conducive to the theoretical practice of Internet geography and network information space research,and on the other hand,it provides a scientific basis for planning the development direction of the MRYR.Based on the Baidu search index between cities in the MRYR in China in 2011 and 2017,this paper uses Ucient to study the spatial evolution of MYUA information flow from the spatial structure and spatial organization of information flow network.At the same time,the demand maps of cities in the MYUA are obtained,and the text classification is carried out through NLPIR(Big Data Search and Mining Sharing Platform)to construct an indicator system for the influence factors of information flow spatial evolution.Based on this,the geo-detector is used to analyze the factors affecting the spatial evolution of MYUA information flow from four aspects:factor detection,ecological detection,risk detection and interaction detection.The following conclusions were obtained:(1)The information connection between cities in the MRYR has been continuously enhanced,and the spatial structure of information flow(SSIF)is becoming more and more networked,gradually forming a "Multicentric network"structure.The MYUA is driven by information production networks centered on the three major capital cities.The development of consumer integrated networks;the exchange of information between cities is more convenient,the connectivity of urban information networks is enhanced.Wuhan,Changsha and Nanchang have always been in the first place in the area of information connectivity and are constantly increasing;The phenomenon of small group agglomeration in MYUA is obvious,and basically forming four subgroups,but the internal members of the sub-groups vary greatly from year to year,gradually breaking the administrative boundary and presenting a jumping cohesion subgroup.(2)For the MYUA in the MRYR,there are interannual differences in the dominant factors affecting the SSIF.The SSIF in the MRYR in 2011 is relatively simple,the dominant factors affecting the production and consumption networks of information flow space are generally Consistent,mainly urban background factors such as urban center strength and network communication level,the asymmetry of information flow production and consumption network in the MRYR in 2017,the direct factors of the city such as network communication level and housing level are the dominant factors affecting the information production network.Urban economic development opportunities and central strengths are the main factors affecting the information consumption network;the mutual coupling between the various impact factors determines the formation and evolution of the urban group network information space,and the strength of the double indicators on the formation of the MYUA information flow space is greater than a single indicator.The influence of indicators on the formation of information flow space,the interaction between various influencing factors of the MYUA information network structure is nonlinear enhancement and two-factor enhancement;different factors have different mechanisms for spatial distribution of the MYUA information flow,and each dominant factor is in the MRYR.There is no significant difference between the dominant factors and the minor factors on the SSIF in the MRYA,but there is significant difference between the dominant factors and the minor factors.There are significant differences among the different levels of the dominant impact factors.The dominant factor has a greater impact on the central cities dominated by the three major capital cities than the peripheral cities.(3)The main factors affecting the regional differences in the total information of cities in the MRYR have undergone major changes,and the main factors affecting the regional differences in the total information among different sub-subgroups are different;The geographic area detection is carried out,and the total information formation mechanism of different sub-group areas is obviously different.According to the geographical detection result,the sub-groups can be divided into different information constraint types.