Study On The Identification Of Key Areas For Ecological Restoration Of Territory In Tang County

With the rapid development of global and regional social economy,increasing human activities have had a great impact on the integrity of biodiversity,ecosystem structure and composition.There is an urgent need for natural or human intervention to carry out ecological restoration and ecological construction activities.Therefore,accurately and comprehensively grasping the key restoration areas is a necessary means to promote territory ecological restoration.This study selected Tang County in the Taihang Mountains,a typical ecologically poor area,as the research area,comprehensively determined the ecological quality and ecological service value,and then determined the ecological source,the minimum cumulative resistance model was explored to construct the ecological resistance surface,and built the ecological corridor and the ecological corridor based on the circuit theory.Identified the key areas to be repaired,combined the landscape index method,the principal component.analysis method,and the granularity inverse method to determine the optimalgranularity of each key area of construction,and further calculated the optimal construction scale through the spatial network analysis method,which would be used for all key areas to be repaired in the entire region.The spatial distribution map was superimposed on the minimum cumulative resistance value map,the restoration sequence was superimposed,the land use type map was superimposed,and the composition of each key area was explored,so as to propose priority protection for ecological pinch areas,priority restoration for ecological obstacle areas,and enhanced maintenance for ecological breakpoint area,low ecological quality areas to improve the quality of the habitat to prevent the continuous deepening of the restoration measures.Research shows:1)The remote sensing ecological index of Tang County in 2000,2010 and 2018 was 0.57,0.64 and 0.56,respectively,and the ecological quality was at a good level,reflecting that the basic ecological quality of the study area was relatively good,and the overall change in the past two decades was the first decrease after rising.2)Based on the evaluation results of the habitat quality and ecological service value in Phase 3,a total of 10 stable ecological sources were identified,covering an area of 91.22 km2,accounting for 6.4%of the total area,mainly distributed in the north and southwest of the study area.Land use types were forest land and water area;20 ecological corridors were constructed with a total length of 240.66km.The spatial distribution difference was obvious,mainly affected by the distribution of ecological sources,distributed in the northern and central regions;28 ecological pinch areas to.be restored were identified,There were 37 ecological obstacle areas and 28 ecological breakpoint areas.The area of low ecological quality area was 178 km2,accounting for about 10%of the total area.3)Extracted woodland,grassland,and water areas as ecological land,construct landscape component structure diagrams of different granularities,and selected the average proximity,spread,critical ratio,cohesion,sub-dimension,aggregation and other landscape pattern indexes for calculation.Principal component analysis was performed on the results,and the optimal particle size for constructing key ecological areas was selected as 120m.The construction scale of each key area was further calculated by the spatial network analysis method:the area of the pinch area was 39.76hm2,and the area of the obstacle area was 52.99hm2,the area of the fracture point is 40hm2.4)Analyzed the spatial distribution maps of all key ecological areas to be restored in the entire region,and restore the key areas in the middle of the longer ecological corridors,the key areas that were concentrated,and the key areas that overlap in space first,and then used the MCR map again to minimize the overlap In the cumulative resistance value map,the key areas located in the fourth level of resistance value were repaired secondly,and then the key areas distributed in the third,second,and first level were repaired in turn.Proposed protection and restoration measures for ecological sources and ecological corridors,superimposed the distribution map of key ecological areas in Tang County with the land use map,analyzed the composition of each key area,and made respective restoration suggestions based on this.This study can help the government to accurately and intuitively grasp the distribution characteristics of key ecological areas and provide a realistic reference for ecological restoration in the Taihang Mountains.It is of great significance for solving the severe challenges faced by the current territory ecological protection and restoration system engineering and systematically maintaining national ecological security.