The Evolution Mechanism For Fringe Of Chengdu Metropolitan Under The Rapid Urbanization

With the expansion of the urban space, a binary transition area with the characteristic "half city half township","also city also township" generated between urban and rural-urban fringe. Urbanization is the root cause of the fringe area produces, and urban sprawl is the direct cause of its appearance. Based on the background of the rapid development of the contemporary big cities, fringe area in the domain space of urban is the most dynamic, change the fastest, the most complex strip. As urban sprawl "preparation", the communication between urban and rural of conduction and hub area, China’s urban fringe areas due to lack of attention, and thus the prevalence of such as improper planning, control double track, and lack of public service, social security is not complete, environmental degradation and other issues and contradictions in our country. If these problems and contradictions properly handled, fringe area will become the new driving force of urban development and a new growth point, otherwise, it will become the urban development of disaster-prone areas and engulfed the results achieved by the urban development. For the evolution of urban space, the development of the marginal zone is extremely important.From1990to2010, Chengdu construction area is from74.4km2expansion to455.56km2, which accounts for city center area ratio from12.46%increased a whopping76.3%, and the significant urban sprawl. Elements as the core city of Chengdu (population, industry, culture, etc.) in the context of rapid urbanization, spread quickly to the peripheral semi-urban or low-level urbanized area, the Chengdu metropolitan urban domain structure appeared in a circling the fringe of the form. Committed based on the strong lure of the city, Chengdu Metropolitan Periphery has undergone a tremendous change, and the entire metropolitan area is the most active and fastest changing space zone. This paper aims to Chengdu city fringe area characteristics, evolution process and mechanism, the problems and contradictions to explore, while understanding of urban sprawl, the laws of motion and mechanism theory, for Chengdu city expansion and development planning, control and guide provide guidance.The theoretical basis of the summary and combing previous studies, the article mainly uses a combination of literature analysis and empirical analysis of macro Chengdu Metropolitan Periphery overall characteristics and microstructure typical functional area. Through the endogenous urbanization (suburb urbanization) and exogenous urbanization (suburb urbanization), two kind of urbanization mechanisms, and to illustrate the edge of the dynamic evolution process. Contains city induced and the region has the advantages of dual function, gives a comprehensive overview for the fringe area on the evolution of the source of power. Faces to the reality of urban sprawl for many years and the integration of urban and rural areas, find out the marginal zone in the process of the development of the main existing problems and contradictions.This paper argues that in the process of urban development, the eyes can not stay in the center of the city, but to take into account the overall situation, the fringe area also incorporated into the overall urban planning. Urban fringe is not just the future of the city, the function of ease, or the urban core and the periphery of the hub, the city’s ecological green lung, the new population receptively. Therefore, we must first guide the orderly development of the city as a whole through the planning, starting from a macro overall with microscopic detail, integration crushing, fragmented source to avoid the chaotic development of the fringe area; Second, Gradually establish a multi-agent development management pattern, pay attention to the protection of the interests of local farmers, proper disposal of the subsequent life issues of land acquisition and resettlement of landless peasants, the farmers into citizens as social and economic development is a great source of power; Finally, combined with "the world modern rural city" the idea, from the amount of urbanization to the urbanization of the quality of change, The formation of the economic, social and natural environment of collaborative development system, to a beautiful ecological, social justice, the integration of urban and rural areas to the high degree to planning and development of fringe area.