Optimization Of Urban Spatial Economic Structure

With the economic system, social structure and the transformation of people's life and work demands change attitudes so that Chinese cities are changing on the quality and quantity:on the one hand and improve the urban spatial structure and changes of the internal functions of the city, so urban morphology changes, to achieve an absolute increase in the size of the city; the other hand, extending the urban framework, boundaries blur, so the city is no longer a separate individual existence, urban agglomeration, with the emergence of the city so that the macro-scale urban cities also expanding. With the continuous expansion of city size, resources and environment constraints of urban development has become increasingly prominent, the emergence of the city traffic congestion, reduction of resources, environmental degradation, air pollution, increased unemployment and increased social instability and other "urban disease" from the history of urban development all over the world point of view, it exists to varying degrees in various cities in each country. Now our city has entered a stage of rapid expansion, it is also "urban disease" in a concentrated outbreak. In this context, this paper takes urban space optimization of economic structure as the research object, from two perspectives migration and economic concentration of urban population to the economic space, the integration of multiple disciplines of economic geography, regional economics and demography, combined with the use literature, logical method, the center of gravity of the model law, gathered a variety of research methods dimension models method and gray correlation method, through the combination of qualitative analysis and quantitative analysis, theoretical research and empirical analysis, dynamic analysis and static analysis combining It means, and strive to find the city spatial structure of economic development in the dynamic changes of the status quo and development trend, hoping to provide a useful reference for the development of urban construction and development of economic theory and reality in the city.The main contents of this research include:First, by domestic and foreign literature review on urban spatial structure, formation and evolution of dynamic discovery of urban spatial economic structure mainly from the combined effect of economic activities and population in the urban space, and the former people for the study of fresh urban space involving economic structure, especially the lack of empirical research, which is the major component of this study; the second is based on the definition and connotation of urban space causes economic structure, population urbanization theory, space urbanization theory and new classical urbanization theory on the basis of constructed based on the following specialization perspective of migration and economic concentration of urban spatial economic structure evolution of the theoretical framework and mathematical model; based on urban industry agglomeration externalities (Marshall externalities) of economic activities and population migration also has the combined effect of population concentrated further promote the city's economic agglomeration due to the limited space of the city, gathering to a certain extent will produce spillover effects on this idea, the formation of a paper economic concentration-population intake-diffusion effect-emigration-the formation of the new gathering center-population intake-structure Evolution of urban spatial economic Research logic, the city's population and economic migration as urban agglomeration forming space economic structure, evolution and optimization of the starting point. Third, the development of urban space economic structure, composition, characteristics and effects analysis, found that the metropolitan spatial economic structure of developed countries have experienced from the beginning of the formation of homogenization economic center of the city, and to the development of multi-center urban sprawl the emergence of the city such a process, and the formation of economic spatial structure borne by the different functions of production space, service space, residential space and the type of space consisting of ecotourism city. Fourth, based on the above studies were based on the perspective of migration and economic concentration of economic evolution of urban spatial structure is studied, where first urban economic agglomeration and migration, the relationship between the distribution of study through space Metrology and Inspection migration found spatial effects, economic and urban spatial structure was evaluated and analyzed; then analyzes the economic role of urban agglomeration spatial structure of the economy, the impact mechanism and mode of analysis, the focus of the model and aggregation dimension model combining estimates distribution of the Xi'an economic center of gravity; and then respectively and Beijing, Shanghai, Guangzhou, Changsha, Wuhan, Xi'an and Chengdu seven of a certain size and can represent the Chinese eastern, central and west of the city as the analysis object by index Construction of evaluation system, screening and optimization of data, using the gray relational grade analysis method for dynamic comprehensive evaluation and comparative analysis of various cities. Fifth, the proposed way to optimize the economic structure of urban space and suggestions from the spatial structure, spatial structure and urban spatial structure of urban functions of the three dimensions of urban industry. Finally, conclusions and further pointed out the shortcomings and problems to be solved in this paper.The main conclusions of this study are:First, migration between urban and spatial evolution of the economic structure is mutual promotion and mutual checks and balances. Migration is the impetus for change in the economic structure of urban space, under normal circumstances, the impact of migrants on the economic structure of urban space is divided into three stages:the formation of urban agglomerations center to the outward expansion of the city, further migration and urban agglomeration forming a pattern of multi-center, and become to a certain extent when the migration space constraints of urban development, urban development can only proceed from the configuration of resources within the city, it is also needed from regional macro perspective systematically. Second, the economic concentration expand the urban spatial economic structure of urban spatial economic structure is a reflection of urban agglomeration degree and form of economic agglomeration effect of resources in different combinations, different options location determines the urban space of economic structure adjustment of urban spatial economic structure and varies depending on the role and economic changes in urban agglomeration effect, therefore, to optimize the economic structure of urban space is essentially the process of rationalization of urban agglomeration economic structure and layout. Third, adjust the economic structure of urban space can effectively promote the city's economic development, population and other economic factors there are also large-scale agglomeration agglomeration behavior of diminishing returns and increasing marginal costs of the law in the city, through the spatial layout of urban density and spatial adjustment can maximize the economic benefits of the land, which is more efficient use of land resources in the economy gathering area, combined with proper dispersion layout, avoid excessive intensive or excessive fragmentation brought uneconomical. Deficiencies of this paper is no social structure, environment, research into the structure of urban spatial structure was found to influence future research should be information on urban spatial economic structure as the main direction.The innovation of this study:First, relatively new perspective in the study of economic problems in the city, the extensive research literature are concentrated in urban scale, urban economic performance influencing factors of urban industrial agglomeration and urban spatial structure evolution, etc. few documents related to the economic structure of urban space. This study based on the perspective of migration and economic concentration, the optimization problem of urban spatial economic structure research, trying to make up for the lack of relevant research literature; the second is the center of gravity model and aggregation dimension model combined analysis of urban agglomeration degree and urban economic center of gravity of the spatial distribution; third is gray correlation analysis method, east, central and western representatives of the seven cities studied, by optimizing the selection of indicators and data, respectively, from the dynamic and static two angles to the analysis and evaluation of the economic structure of urban space; Fourth, learn from the development experience of developed cities, the economic structure of urban space proposed optimization measures and related suggestions from the city spatial structure of urban functions, urban industrial spatial structure and urban spatial structure.