Study On The Optimization Of Green Space System In Dingxiang County Based On The Construction Of Ecological Security Pattern

Based on the analysis of the research background and the policy background of ecological civilization and land space planning,this thesis puts forward that the theory of ecological security pattern is an important planning means for urban ecological health,and then puts forward that green towns are an important component of green space,and clarifies the problems and significance of green space system construction in Dingxiang CountyStarting from the theoretical development process,spatial structure and important characteristics of ecological security pattern,this thesis analyzes the research progress of ecological security pattern theory at home and abroad,and summarizes the related research on urban green space layout structure.Combing the theories of human settlements,landscape ecology and sustainable development,this thesis constructs the theoretical framework of this study.Finally,through the analysis of excellent cases at home and abroad,it provides practical guidance and reference for this study.This thesis analyzes the location and natural resources of Dingxiang County,and refines the green space pattern of matrix space,patch space and corridor space.The factors that affect the layout structure of county green space,such as urban spatial structure,county tourism development,urban traffic conditions and historical and cultural conditions,are detailed.Finally,the existing problems of green space are summarized.Firstly,the relevant data of Dingxiang County were collected and preprocessed to build the Dingxiang County Ecosystem Health Assessment Database.Then,the ecological sensitivity and the importance of ecological function were evaluated by single factor evaluation with the indicator,and then the comprehensive evaluation was carried out to identify the ecological environment problems and the important areas of ecological function in Dingxiang County,It provides the basis for the next step of ecological security pattern construction.Firstly,the important ecological elements of Dingxiang County are identified,including the selection and classification of hub center,the minimum cost path model is applied to construct the ecological flow resistance surface of Dingxiang County,and the multi scene ecological corridor is simulated,and then the corridor is superimposed to form a systematic and perfect grading system.Through the construction of corridor network,small green patches are identified,and a neutral ecological security pattern system is finally constructed.On the basis of the above research,the thesis puts forward the optimization strategy of green space system in Dingxiang County.Then,it puts forward the system optimization strategy for the core green space hub in Dingxiang County,including the classification and protection of forest resources,the improvement of forest ecosystem function,the recovery of forest resources,the control of forest land use and scientific utilization.Then,the optimization strategies are put forward for the corridor system,including the ecological corridor relying on the water system,the ecological corridor relying on the road and the ecological corridor relying on the ridge.Then the small patches are classified into damaged mountain,water conservation and mine geological environment,and the optimization strategies are put forward respectively.Finally,the layout of green space system in the central city is optimized.