Research On The Innovation Spatial Pattern And Formation Mechanism Of Three Major Urban Agglomerations In The Yangtze River Economic Belt

Innovation is the foundation of a country's sustainable development.In the 20 th century,the United States surpassed the United Kingdom to become the world's number one power.Japan's rapid rise after the war and even the United States are the result of long-term innovation.In the key historical period when middle-income countries are heading towards high-income countries,China can only avoid innovation and develop new industries and improve the level of traditional industries,so as to avoid falling into the “Latin American trap” due to technological dependence and ensuring long-term sustainable economic growth.It can be seen that improving the ability to innovate and achieving technological breakthroughs is a core proposition that must be consistent in China's strategy to achieve a strong country.The Yangtze River Economic Belt has always been the birthplace of important decision-making in China.It relies on the golden waterway to connect the Yangtze River Delta urban agglomeration in the coastal economic zone,the most developed urban agglomeration in the middle reaches of Yangtze,and the Chengdu-Chongqing urban agglomeration.The important economic corridors and regional urban clusters are particularly important in the national regional economic innovation pattern.In recent years,while the economic development of the Yangtze River Economic Belt has achieved remarkable achievements,the regional gap has gradually expanded,incoordination and unsustainability have become increasingly serious.Therefore,the research on the spatial pattern of innovation in the three major urban agglomerations is under the background of reducing the regional innovation gap and accelerating the process of regional integration.This paper firstly illustrates the necessity of the combination of the theory of "flow space" and the theory of urban geography.At a certain regional scale,the flow of talent accelerates the reconstruction of the spatial pattern of urban agglomeration innovation.Subsequently,we start from the industrial clusters related to the new economic geography to explore the possible rules in the process of spatial differentiation of innovation in urban agglomerations.Combined with the systematic discussion of the above theory,we find that the current literature mainly studies from the perspectives of innovative spatial structure features and spatial knowledge spillovers,ignoring the process of spatial resource endowment dynamic changing,and being difficult to recognize laws between spatial knowledge spillovers and innovation space.The research on human resource flow in this paper is surpassing the dual perspective of geography research and economic research,integrating and forming a unified research framework in multiple perspectives,and rising to a new “liquidity paradigm”.Secondly,in order to comprehensively study the spatial differentiation characteristics,this paper then uses the empirical orthogonal function,center of gravity migration model,standard deviation ellipse and Moran's I index analysis method to study the spatial differentiation characteristics of regional innovation in Yangtze River Delta,the middle reaches of the Yangtze River and Chengdu-Chongqing urban agglomeration.The study found that there are significant spatial correlation patterns among the three major urban agglomerations,and innovation under different indicators shows spatial correlation of different intensities.At the same time,the spatial differentiation characteristics of different regions are distinct.Among them,the stable spatial structure of the Yangtze River Delta region has a “Z” structure;the stable spatial structure of the middle reaches of the Yangtze River presents the core structure of “three pillars”;Chengdu-Chongqing district presents a dual core structure.And the three urban agglomerations show a discrete trend in different directions.Then,this paper explains the reasons for the appearance of these spatial features.We examined the impact of R&D staff mobility on the innovation of urban agglomerations by panel data of 70 cities in the three major urban agglomerations from 2007 to 2016.Firstly,under the revised population migration gravity model,the measurement of R&D staff flow is realized,and then the benchmark regression model is established.The direct effect of R&D staff flow on the innovation of urban agglomeration is empirically analyzed,and the three urban agglomerations are tested separately.Secondly,the mediating effect model is established to test the cumulative effect of human capital and the effect of industrial agglomeration,and further verify the mediating effect of R&D staff mobility on the independent innovation of urban agglomeration.The results show that R&D staff flow promotes innovation of urban agglomeration through human capital accumulation effect and industrial agglomeration effect,and the effect is significant,that is,the mediation effect exists.Finally,based on the spatial differentiation characteristics of the previous analysis and the mediating effect of R&D staff mobility on urban innovation,this paper draws the main conclusions and combines the current development status of the three major urban agglomerations to propose several suggestions.Meanwhile the shortcomings in this study and the direction of further research are illustrated.