Quantitative Analysis And Driving Factors Of Urban And Rural Spatial Form In North Jiangsu Area

For a long time,there is a certain gap between the urban and rural development in northern Jiangsu and the southern Jiangsu.Under the background of the revitalization of northern Jiangsu,Jiangsu Province has issued a series of policies to promote the integration of urban and rural areas in northern Jiangsu,promote the construction of urban and rural living circle,and improve the infrastructure.The 8th Plenary Session of the 13 th CPC Jiangsu Provincial Committee put forward new requirements for the construction of beautiful Jiangsu to coordinate the ecological space of production and living and optimize the spatial layout of urban and rural areas in north Jiangsu.County city in northern Jiangsu as a new carrier of urbanization,urban space between urban and rural areas in County city urban space development direction,pattern of land use,rural spatial development stagnation,weak links between urban and rural areas,is an urgent need to study on the urban and rural space form,and promote more intensive economical utilization of urban space,the village spatial agglomeration concentration,optimize the spatial structure of urban and rural.In this paper,the generalized research object is the county-level city in northern Jiangsu province,and the detailed research object is Donghai County,and the research method is constructed according to the research object.Using typology,rurality index and cluster analysis,this paper summarizes the overall characteristics of urban and rural spatial form of county-level cities in northern Jiangsu province from four aspects of urban space,town space,rural space and urban and rural spatial structure.Landscape index,construction land change rate,quadrant orientation analysis and landscape expansion index were used to describe the shape characteristics,expansion speed,expansion direction and expansion mode of urban space,town space and rural space.The rank-scale model,gravity model,sprawl and cohesion index were used to describe the structure of "city-town-village",the spatial integration mode of urban and rural areas and the spatial connectivity of urban and rural areas.Coupling analysis of natural environment,economic society and other factors to explore the driving mechanism of urban and rural spatial morphological evolution.The overall characteristics of county-level urban space in northern Jiangsu province are multi-point decentralized development,weak urban agglomeration and radiation function,and the urban space form is mainly lumpy and partly zonal.The overall characteristics of the spatial form of towns are as follows: there are many towns,and no centralized scale effect is formed.Rural spatial form can be divided into three types: scattered distribution of strong rural villages,zonal distribution of medium rural villages and lumpy distribution of weak rural villages.The urban and rural spatial structure is pyramid with low density and low degree of agglomeration.The spatial shape of Donghai county tends to be unstable,with obvious extension expansion and rapid spatial growth.One-way expansion gradually turns to multi-direction expansion,and the expansion mode is edge expansion.The spatial shape of the town tends to be stable,showing a growth trend of "steep at first and then slow",with different development directions and coexistence of edge expansion and filling expansion.In terms of rural spatial form,the rural spatial scale decreases first and then increases,and the overall distribution of villages is homogenized.In terms of urban and rural spatial structure,the "city-town-village" system is unbalanced,the development of county towns is polarized,and the correlation intensity between urban areas and townships is constantly increasing,but the correlation intensity between townships needs to be enhanced.Urban and rural expansion from discrete expansion to cohesive expansion,connectivity is constantly strengthened.The urban and rural spatial form of Donghai county has some problems,such as the increasing trend of urban spatial spread and low-density diffusion,the low degree of rural spatial fragmentation and agglomeration,the unreasonable urban structure,and the insignificant driving effect of the central city.The spatial evolution of Donghai county is the result of many factors.Natural environment plays a fundamental role.The spatial patch area of urban and rural areas shows a step-like distribution with the change of elevation,and the spatial evolution of urban and rural areas shows obvious hydrophilicity.The distribution of disaster adverse areas affects the spatial morphological evolution of urban and rural areas.Economic society plays a decisive role.Urbanization is the direct driving force of urban and rural spatial evolution,and the evolution of urban and rural spatial form is the external representation of economic development.Urban-rural differences affect urban and rural spatial form.Transportation conditions play a driving role,transportation convenience provides power for the evolution of urban and rural spatial form,and transportation network enhances the spatial connection between urban and rural areas.Municipal and public service facilities play a supporting role.The improvement of public service facilities provides support for the evolution of urban and rural spatial form.Municipal infrastructure is the prerequisite for the evolution of urban and rural spatial form.Policies and measures play a guiding role,the revitalization strategy of northern Jiangsu promotes the evolution of urban and rural spatial morphology,land planning and institutions restrict the bottom line of urban and rural spatial morphology evolution,urban and rural planning guide the rational evolution of urban and rural spatial morphology.In 2000,the natural environment was the main driving factor,and municipal and public service facilities were the supporting conditions for the evolution of urban and rural spatial form.In 2010,economic and social factors and municipal and public service facilities became the leading factors for the evolution of urban and rural spatial form,and policy measures and transportation conditions assisted the evolution of urban and rural spatial form.In 2020,municipal and public service facilities are the leading factors in the evolution of urban and rural spatial forms,and policies,measures and transportation conditions play an auxiliary role in urban and rural spatial forms.Finally,this paper summarizes the driving system of urban and rural spatial morphological evolution under the interaction of five driving factors.Based on the above analysis,this paper proposes the optimization strategy of urban and rural spatial form.Urban space form: set up the bottom line thinking,adhere to ecological priority;Adjust the direction of urban development and use land with high quality and high efficiency;The spatial morphology of multiple clusters.The spatial form of town: control the fragmentation of boundary patches and improve the compactness of boundary;Priority should be given to stock,and the development boundary of elasticity and rigidity should be delimited.Rural spatial form: according to local conditions,reasonable classification of villages;Shape village characteristics and guide the construction of residential areas.Urban and rural spatial structure: rational allocation of spatial resources,optimization of urban and rural spatial structure: rational guiding function,county town agglomeration,leading key towns.