Research On The Ecological Resilience Of Green Infrastructure In Resource-based City

As a typical resource-based city,Wuan is in a new stage of urbanization.On the one hand,the mining,processing and transportation of mineral resources have brought great benefits to the regional economy,which has made important contributions to the development of the national economy.However,the excessive and unordered mining of mineral resources inevitably causes the destruction of terrain and geomorphology,the broken land use structure,the shrinking ecological space,the weakening of the ecological function,and the severe ecological environment.On the other hand,the rapid urbanization has led the ecological space around the city to be constantly eroded and the habitat fragmentation is increasingly serious.The green infrastructure network can effectively balance the demand contradiction between the economic development land and the ecological land.It can provide many ecological functions for the city and guide the sustainable development of the urban space,which is of great significance to the solution of the urban ecological environment.The Maryland green plan is considered to be the best green infrastructure plan in recent years.It is the first to explore the green infrastructure evaluation model(GIA)and put it into practice,which is widely used in the balance of land development and protection,conservation of natural resources and biodiversity conservation.This paper takes the resource-based city of Wuan as an example,based on the remote sensing image interpretation data,extracts the green infrastructure elements,combines the green infrastructure with the ecological resilience,constructs the ecological resilience evaluation model of green infrastructure analyses the classification of ecological resilience and puts forward the corresponding hierarchical optimization suggestions,which makes great significance to the excavation of potential ecological resources in Wuan city and the improvement of urban ecological space environment,provides suggestions and references for land use planning and decision-making,and provides the basis for the rational and efficient use of land.The specific conclusions of this study are as follows:(1)Identify the green infrastructure elements of wuan.It is generally believed that the green infrastructure is a natural and artificial green space network system composed of hubs and links.Using the area threshold,the land use type which is stable and the area greater than 100 ha of forest land and grassland are used as the ecological source,and the minimum cost path is analyzed by setting the space resistance surface.The path method generates the best ecologicalcorridor model,identifying 44 ecological sources and 66 potential ecological corridors.(2)Build the ecological resilience evaluation model of green infrastructure.Drawing on the "GIA system" of Maryland green plan,this paper constructs the index system of two scales of green infrastructure element(ecological source,ecological corridor)and grid unit,and uses Yaahp analytic hierarchy process to determine the weight of each index,introduces five grades score index and prepares for the subsequent evaluation and classification of ecological resilience of green infrastructure.(3)Evaluation and classification of ecological resilience of green infrastructure.Based on the evaluation model of ecological resilience,two scales of evaluation of spatial element and grid unit are carried out,and the raster overlay operation of the results of two levels is divided into 5levels.The results show that the ecological resilience is higher in the northwest and the southwest,and the ecological resilience of the two seasonal rivers in the north and south minghe river and ecological corridors in the northwest is higher.The ecological resilience level of ecological sources and ecological corridors in the vicinity of the urban area and mining area is relatively low.(4)Hierarchical optimization of green infrastructure.According to the evaluation and classification results of the comprehensive resilience of the green infrastructure in Wuan,the corresponding optimization strategies for the classification of the green infrastructure elements are put forward.At the same time,the green infrastructure planning is integrated into the traditional urban and rural planning system of Wuan based on the overall planning of land use and urban planning in Wuan,and the corresponding implementation strategies are put forward.