Research On The Spatial Expansion And Land Inner Structure Transformation Of The Big Cities From 1949 To 2005 In China

Urban as a complex compounded body, experiencing growth, grandness, decline, the process of disappearing, and so on. Today, in population growth, economic development, urbanization process accelerate constantly, the increasing scarcity of land resources, The change of urban land use structure getting intensive increasingly, urban expansion process is more and more difficult to controlled. Therefore, effective guidance and control urban expansion and rational utilization of land resources within the city's research work has important strategic and practical significance.In recent years, many scholars from different views on urban land use and Form of changes in time and space on a great deal of fruitful research, revealed the use of urban land in the plane, stereoscopic and structure of the space characterization, for the rational allocation of land resources, the effective use and Urban planning to provide a reference for. However, while many domestic and foreign-related outcomes, but can be explained in depth from a planned economy to the reform and opening up period (transition) China's urban space (expansion) in transition and its systematic and mature mechanism of the relevant theoretical models are still relatively rare, more research results For empirical analysis, are more geographically biased and eastern coastal cities of the case, and to major cities in the country for the scope of the study, a systematic study of the very few results, while changes in the urban space and its internal mechanisms of research, more from the external expansion of the city Point of view, the land within the city differentiation process and the characteristics of small, but from a macro and micro perspective of combining a comprehensive analysis of the results of research and little more.For these reasons, the paper first established from the planned economy period to the transition period, China's major cities in space structure and evolution of the basic mode of urban land use assumptions related to the restructuring of the ideas and theories, and special types of cities (Valley Basin City) extended the theory of space Vision and secondly from the qualitative and quantitative point of view, the first major cities to the country for the study of urban expansion trend (macro, the plane) and urban land within the characteristics of structural changes (micro-, three-dimensional on) a summary; then proceeded to China Basin Valley city of typical cases - Lanzhou City as an example, from 1949 to 2004 using different years of relevant data, the use of information entropy, with an average annual expansion index (AGI), such as the transfer matrix method, the expansion of the city of Lanzhou Space-time evolution of land use changes and the number, type, extent and speed, characteristics and mechanisms for the systematic study to verify the validity of assumptions, reasonable.Through the above analysis, the final papers with urban expansion and land-use changes in the structure of the two development trajectory, from different time slots on the impact of external expansion and cities within the different parts of the main factors driving force and mechanism.