| Not only tremendous achievements have been made,but also the growing "urban disease" and "rural disease" have been induced in the period of rapid urbanization in China.Both traditional urban and rural development pattern is unsustainable,resulting in the increasing urban-rural binary structural contradictions at present.Urban-rural integrated development is the only way to resolve the dual-structure between cities and rural areas in the critical period of social-economic transition.Under the context of the new era,constructing reasonable urban-rural settlement system is an indispensable measure to promote the integration of urban and rural areas.There is of great theoretical and practical meaning to perfect the system of urban-rural settlement by the means of exploring the evolution paths as well as driving the mechanism of urban-rural settlement system.Furthermore,this study can create a new idea of the research on urban-rural settlement as well as provide science evidence to promote urban-rural integrated development and rural revitalization.This thesis uses the well-developed Jiangsu province located in the coastal region of southeastern China as a case,as well as constructs the evaluation method of urban-rural development at county level.And all the counties of Jiangsu province are evaluated by Urban-Rural Development Index and can be divided into three types.Subsequently,Zhangjiagang,Taixing,and Lianshui are chosen as the research representatives.On that basis,this thesis explores the evolution paths and the driving mechanism of urban-rural settlement system at county level under the context of rapid urbanization,taking"pattern-process-mechanism-optimization" as the main line.According to the land change survey data and remote sensing data,varieties of research methods,such as the combination of theoretical research and empirical analysis,the integration of static analysis and dynamic research,and the combination of statistical analysis and spatial analysis,are utilized.According to the research as mentioned above,this thesis comes to the below conclusions:(1)Revealing the current pattern of urban-rural settlement system in three typical counties.? For Zhangjiagang,the urban-town's-rural size structure shows the"olive-pattern" feature;grade structure of settlements indicates the "inverted triangle"feature;its primacy degree is 0.79,and Ziff index is 1.22;the size structure of towns in the county demonstrates the characteristic of "graded" distribution;while the low values of kernel density indicates "2 belts" pattern;spatial cluster of settlements presents the"triangle-pattern" feature;the spatial structures of towns are mainly single-center and double-centers.?For Taixing,the urban-town's-rural size structure shows the "pyramid-pattern" feature;the grade structure of settlements indicates the "trapezoid" feature;its primacy degree is 1.32,and Ziff index is 1.04;the size structure of towns in the county indicates the characteristic of "graded-balanced" distribution;while the low values of kernel density presents the "L" pattern;the spatial cluster of settlements shows the"inverted T-pattern" feature;spatial structures of towns are mainly multi-centers and weaken-center.?For Lianshui,the urban-town's-rural size structure presents "san-pattern"feature;the grade structure of settlements indicates the "triangle" feature;its primacy degree is 3.15,and Ziff index is 0.83;the size structure of towns in the county shows the"polarized-balanced" distribution;while the low values of kernel density presents "2 pointss+1 belt" pattern;the spatial cluster of settlements shows the "dumbbell-pattern"feature;the spatial structures of towns are mainly double-centers and weaken-center.(2)Summarizing the evolution paths of urban-rural settlement system at county level.Based on the empirical study,this thesis summarizes three typical evolution paths of urban-rural settlement system at county level in Jiangsu province,including Developed County,Medium Developed County,and Less Developed County.On this basis,the general evolution paths of urban-rural settlement system at county level are concluded.From the scale structure:?The number of settlements in the county is decreasing,yet the total size is increasing;?The urban-town's-rural size structure is evolving from the"stele-pattern" to the "san-pattern",then to the "stele-pattern",the "pyramid-pattern",and the "olive-pattern" in the stage of rapid urbanization.? The number and built-up area of high grade settlements are increasing,and grade structure at county level evolves from"triangle-pattern" to "inverted triangle-pattern".?The polarization feature of county's development becomes increasingly significant before becoming growingly weaken.?The inequality of size distribution is increasingly significant,yet the change speed increases before decreasing.From the spatial structure:?The degrees of spatial agglomeration and connectivity are growing increasingly strengthened and the largest patch index is increasing significantly in the whole pattern.?Spatial distribution density is continually decreasing in the county,and the changes are mostly located in the surrounding Chengguan town and key towns.?The center of spatial distribution keeps away from the geometric center of the county to the Chengguan town,and the speed is accelerating during the process of urbanization.?The characteristic of the spatial cluster of the urban-rural settlement system becomes increasingly significant,and the areas and number of hot-points are increasing rapidly in the county area.? The spatial structure of urban-rural settlement system evolves from single-center to double-center,and then to multi-center.(3)Revealing the driving mechanism of the urban-rural settlement system at county level.This thesis explores the different effects on urban-rural settlement system in three typical counties from several important factors,such as geography conditions,urbanization,economy,traffic network,institution and administration.On this basis,this thesis puts forward the driving mechanism of the urban-rural settlement system at county level.There is close interaction among urbanization,economy,traffic network,institution and administration,and all these constitute a "four-wheel" driving system.There are spatial organization rules as well as the "structure-function" mutual adaptation rule in the driving process.The urban-rural settlement system evolves from the low level to the high level and the driving result has certain feedback function to the driving process.(4)Concluding the problems and strategies in the developing process of urban-rural settlement system.There are some problems in the evolutionary course of urban-rural settlement system,such as the unsustainable pattern of rapid expansion of urban-rural construction land,the dilemma of institutions and regulations,as well as the lack of systematic guidance of town and country planning.Insisting on the ideas of urban-rural community and urban-rural integrated development,this thesis puts forward four countermeasures,including strengthening the theoretical research on the optimization of the urban-rural settlement system,perfecting the institution and regulation of the urban-rural integrated development,promoting the self-renewal of urban and rural settlement,and exploring the pluralistic models of the reconstruction of the urban-rural settlement system.The innovations of this thesis are as follows:(1 Focus on the research theme of urban-rural settlement system,and put forward the evaluation method of the urban-rural settlement system at county level from two aspects,including scale's structure and spatial structure,and then reveal the evolution paths of urban-rural settlement system at county level in the stage of rapid urbanization.(2)Explore the affection on urban-rural settlement system from geographical conditions,regional economy,urbanization,transport network,institution and management.On this basis,this thesis puts forward the driving mechanism of the urban-rural settlement system at county level by adopting the method of system analysis. |
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