The Research On The Ecological Spatial Pattern Of Zhuzhou’s Main Urban Area Based On Sponge City

In recent years,due to the damage of ecological environment caused by urban expansion and construction,it is easy to flood when the precipitation is concentrated,and drought when the precipitation is too little,which seriously affects the normal operation of the city.Studying the urban ecological spatial pattern under the construction goals and concepts of sponge cities has positive guiding significance for guiding the application of corresponding engineering or biological sponge technology,solving the problems of urban rain and flood and water shortage,and achieving reasonable development and construction on the basis of protecting the ecological environment.Based on system theory,low impact development,landscape ecology and other related theories,combined with ecological sensitivity analysis,ecosystem service value evaluation,GIS spatial analysis technology and other technical methods,this paper put forward the construction path of ecological spatial pattern based on sponge city theory and construction objectives.And taking Zhuzhou’s main urban area as the research object,according to the construction path,based on the analysis of the current situation and ecological problems of the region,the paper analyzed the construction objectives and related planning requirements of the sponge ecological spatial pattern;based on the ArcGIS platform,the comprehensive superposition results of the sponge ecological spatial pattern of Zhuzhou’s main urban area were obtained,which can put forward the referential suggestions for the construction zoning of the sponge city of Zhuzhou’s main urban area.The main results were as follows:(1)By combing and summarizing the technical ideas,theoretical basis and technical methods of relevant research and practice cases,under the construction goal and concept of sponge City,this paper put forward the construction road of ecological spatial pattern based on the analysis of construction goal based on the status quo--identification of ecological elements following the evaluation--Optimization of spatial pattern conforming to the planning--Construction of ecological pattern based on the system Path.(2)By selecting three factors of "topography,ecological resources and ecological security",including seven detailed indexes of "elevation,slope,fluctuation,land type,geological security,water system security and human settlements security",the index system of ecological sensitivity analysis of Zhuzhou’s main urban area was constructed,and the superposition analysis was carried out.The results showed that the high ecological sensitive areas are mainly distributed in the northwest and east of the main urban area,accounting for 11.76%;the low sensitive areas are mainly distributed in the built-up area,accounting for 34.02%,which involve Xinma,Xiangjiang new city,Yunlong and other low post plain areas;the medium sensitive areas are mainly distributed in the research area Within the scope of study,accounting for 54.22%.(3)The evaluation system of ecosystem service value was constructed by selecting 9 factors,such as "gas regulation,climate regulation,water conservation,soil formation and protection,waste treatment,biodiversity protection,food production,raw material supply,entertainment culture",and calculation and superposition evaluation were carried out.The evaluation results showed that the areas with the highest value of ecological service in Zhuzhou’s main urban area are mainly distributed in Xiangjiang and other important water systems and reservoirs,Jiulang mountain,Xianyu mountain and other important mountain areas,accounting for 25.68%of the total.The areas with low value of ecological services are mainly located in the central urban area,Xinma,Yunlong and other built-up areas,accounting for 38.15%.Other middle value areas were scattered between the first two,accounting for 36.17%.(4)Based on the results of the sponge ecological spatial pattern of "one ring,one belt,four wedges,many corridors,many nodes and many cells",and according to the different emphases of the ecological sponge function of each ecological element,the sponge city construction of Zhuzhou’s main urban area can be divided into four parts:sponge ecological conservation area,sponge ecological buffer area,sponge construction forerunner area and sponge construction guide area,so as to guide them to adopt corresponding sponge Construction measures.