Research On Change Of Urban Functional Land And The Evolution Of Spatial Pattern

Since the reform and opening up,China has entered the stage of rapid urbanization development,the rapid expansion of urban functional land,the evolution of urban space,revealing the change of urban functional land and its spatial pattern evolution law,can guide the process of new urbanization in China.Suzhou is the strongest prefecture-level city.The functional land use of suzhou central city has changed dramatically,and the functional space succession lineage is complete.The urban spatial structure has evolved gradually from single center to multi-center,and finally formed the present "five district group",now in suzhou as an example,discusses the function of city land use change and its spatial pattern of evolution have certain representativeness.Based on the current urban land use maps of Suzhou in 1985,1995,2005 and 2018,the paper uses Arc GIS software to vectorize the graph files,and extracts the functional land area and location of suzhou central urban area as the basic analysis data.From the perspective of production,living and ecological function space,this paper constructs an analytical framework for the study of production-living-ecological function space in suzhou central urban area,and discusses the change of production-living-ecological function land use in Suzhou central urban area,its spatial and temporal pattern and evolution path.The paper identifies and classifies the urban construction land according to the production,living and ecological functions,and explores the change and transformation of urban functional land,the evolution of functional spatial pattern and its driving mechanism by using dynamic degree,information entropy,equilibrium degree,land transfer matrix,kernel density analysis,circle layer analysis,fan analysis,center of gravity migration and multiple stepwise regression model.This paper explores the evolution of spatial pattern and driving mechanism of urban functional land use change and transformation function,summarizes the characteristics of production-ecological function land use and spatial characteristics in Suzhou,and puts forward the optimization principle and spatial optimization layout strategy.Firstly,according to the Standard of Urban Land Classification and Planning Construction Land(GB50137-2011)and Classification of Land Use Status(GB/T21010-2017),the functional identification and classification of urban construction land are carried out according to living,production and ecological functions,and the " living-production-ecology" analysis framework of central urban area is constructed.Based on the production-living-ecological space classification and evaluation system,the living-production-ecology function land of suzhou central city was graded and assigned.Secondly,using GIS software,this paper analyzes the spatial evolution of suzhou’s urban functional land use and its spatial pattern,and draws the following conclusions :(1)the area and structure type of suzhou’s functional land use are rapidly adjusted.The living function land increased rapidly and the overall structure change was relatively active,the production function land increased rapidly and the type and structure of the land tended to be stable,the ecological function land was transferred out of a large number of areas reduced and the structure adjustment was obvious.(2)The spatial layout of suzhou functional land expands to the periphery of the city.Living space is constantly increasing and spreading to each district group layout,production space is constantly concentrated to the east and west of the urban area layout,ecological space is constantly nibbled and fragmented.(3)The changes of functional land use and spatial pattern in Suzhou are influenced by various factors.The results of multiple stepwise regression analysis show that urban economic development,residential investment,higher education,industrial production and other factors have a relatively large impact on urban land use change and conversion.Finally,according to the relevant objectives and principles,the optimal layout strategy of living-production-ecology space is proposed.In this paper,the living space supplement and space improvement strategy,production space zoning guidance,space remodeling strategy,ecological space ecological constraints,and space restoration strategy are put forward.