Study On The Optimal Layout Of Eco-spatial Structure In Jinzhong City Based On The Ecological Network

In the context of the development of a new era that advocates the concept of low carbon and carbon neutrality,it is particularly important to strengthen the protection of ecological space.With the unreasonable development and utilization of land resources,the tense utilization of natural resources,and the degradation of ecosystem services,ecological space is gradually disturbed,which is not conducive to the sustainable development of regional social economy and ecosystem,but also affects the function of regional ecosystem services.Therefore,how to properly coordinate the conflict between urban construction and ecological security protection in the rapid urbanization process and promote the coordinated development of ecologicaleconomic space is more critical.The construction of ecological network can not only promote the stable development of ecosystem,but also provide support for the sustainable development of cities and the rational utilization of natural resources.This study takes Jinzhong City in Shanxi Province as the research area,the ecological source is identified by the importance of ecosystem service function and ecological sensitivity.Based on the multi-factor structure of source,corridor and node,the ecological network of Jinzhong City is constructed.According to the research results,the optimal layout scheme of ecological spatial structure of“ four belts,three districts,multi-corridor and multi-center ” is proposed.Finally,different protection suggestions are proposed for its layout.The research results and main conclusions include the following aspects.(1)The importance type of ecosystem service function in the study area was mainly highly important,accounting for 25.78 % of the total area of the study area.The dominant ecosystem service functions are water conservation,carbon fixation and oxygen release.The extremely important areas and highly important areas of ecosystem service function are mosaic distribution,which are mainly distributed in the middle of the study area and on both sides of the main ridge of the Taihang Mountains-Taiyue Mountains.The land use types are mainly forest land,water area and grassland.The spatial distribution characteristics of ecological sensitivity in the study area are obviously different.The ecologically sensitive types is dominated by geological disasters and soil erosion.The total area of extremely sensitive areas and highly sensitive areas of ecology accounts for 29.20% of the total area of the study area,which are mainly distributed in areas with good habitat quality,such as natural protected areas.(2)Based on the importance evaluation of ecosystem service function and ecological sensitivity evaluation,20 ecological source patches are identified,with a total area of 4506.29 km2,accounting for 27.48 %of the total area of the study area.Ecological source areas are mainly distributed in the east of the urban intensive areas and the Taihang Mountains,showing a large spatial distribution difference between east and west.The minimal cumulative resistance model is used to extract 33 ecological corridors.From the distribution state,the ecological corridor shows the distribution characteristics of dense east and sparse west,and lacks the connection with the natural ecological corridor.There are 25 ecological strategic nodes and 43 ecological breakpoints in the study area.The ecological breakpoints are mainly distributed in the ecological corridor in the western part of the study area,weakening the connectivity of the ecological network,and must be repaired and controlled.In general,the ecological network in the study area is characterized by dense east and sparse west,and there are problems of insufficient overall connectivity and stability.(3)In order to promote the interconnection of ecological elements,improve the layout of corridors and connect key nodes,through the construction of ecological network,the components of the ecological network are optimized and restructured,and the optimal layout scheme of ecological spatial structure of “four belts,three districts,multi-corridors and multi-centers” is proposed.On this basis,differentiated management and control suggestions are put forward.