Construction Of Ecological Network Of Land Renovation Based On Grain Size Reverse Method

Due to the rapid economic development and population growth,changes in land use patterns have caused conflicts between the ecological environment and economic development.To achieve regional sustainable development through ecological construction is an important part of land remediation.Due to the special natural environment and land use patterns,the Changhe River Basin in Zezhou,Shanxi Province has caused problems such as ecological fragility,severe landscape fragmentation,and low ecological stability.Therefore,the development of ecological network planning for land remediation in this area can not only provide support for ecological protection in the area,but also provide decision-making reference for comprehensive land consolidation in the area.Based on the actual situation of the study area,the present situation of the landscape pattern in the Changhe River Basin was analyzed.Based on the granularity backstepping method and the least cost distance model,the three elements of ecological source,corridors and nodes in the ecological network were studied and the ecological network of the area was constructed.The main research is as follows:(1)The current situation of land use in Changhe River Basin was analyzed,and the landscape features under different grid sizes and grids with the same granularity were calculated,and the optimal size of grain size was obtained through analysis of the results,and ecological source patches were proposed.The results show that: At a grain size of 350 meters,the regional landscape pattern index such as patch density,number of patches,landscape shape index,cohesion index,connectivity,etc.is optimal in the area,and the optimal grain size obtains 36 patches of ecology.(2)Quantitative indicators build a comprehensive resistance surface.Through the investigation and analysis of the study area,four index elements such as landscape types,slopes,elevations,and effective soil thickness that have major impacts on the ecological environment of Changhe River Basin were obtained.Combined with the actual situation in the study area,it put forward the comprehensive resistance of the ecological network construction in the area.(3)On the basis of the comprehensive resistance surface,30 ecological corridors with the lowest ecological resistance value on the comprehensive resistance surface and 41 ecological risk points with the most ecologically vulnerable areas on the corridor were selected to form the complete “matrix-Corridor-nodes' ecological network structure in the remediation area.(4)Comparing the planning results with the status map of land use in the remediation area and the overall plan for land use,optimize and adjust the ecological elements,corridors,and nodes that constitute the network,and provide relevant optimization measures and adjustment opinions.The research results of the thesis have important reference value for improving the regional ecological stability and ecological service function of the study area and improving the overall quality of the ecological service system.