Research On Classification And Network Structure Evaluation Of Green Infrastructure In Resource Based City

With the rapid development of urbanization and social economy,the ecological environment in China is becoming more and more serious.The resource based cities usually take the exploitation of mineral resources as pillar industries,and with the interference of mining activities,the green infrastructure network structure of resource based cities has been damaged to varying degrees,therefore,it is necessary to identify the green infrastructure elements and network framework of resource based cities,analyze and evaluate the current green infrastructure network of resource based cities.Based on the classification of green infrastructure elements and the construction of theoretical network framework model,taking resource based city Wu'an as the research area,identifies the green infrastructure elements in Wu'an,and according to the spatial form of green infrastructure,the green infrastructure elements are classified.Through the classification of green infrastructure,taking the distribution belt of mineral resources in Wu'an as the core,Through the overlay analysis of five interference factors from the distance of mineral resources distribution zone,land use type,population density,altitude and slope,generate the comprehensive resistance surface that influences the construction of green infrastructure network framework in Wu'an,Then the network structure of green infrastructure in Wu'an is identified and extracted,and analyze and evaluate the current green infrastructure network framework in Wu'an.The conclusions are as follows:(1)Green infrastructure elements can be subdivided into categories according to the different research scales,different function categories,different material types and different space form.According to the characteristics of the study area,one or several different bases can be selected to classify the green infrastructure elements.According to the characteristics of Wu'an city and the need of extracting green infrastructure network framework,this paper divides the green infrastructure elements of Wu'an on the basis of the spatial form of green infrastructure elements,the factors of green infrastructure in Wu'an are divided into areal elements,linear elements and point elements.(2)Taking the distribution belt of mineral resources in resource based cities as the core,Three kinds of theoretical network framework models of circle,radiation and mosaic are constructed for green infrastructure network framework.In the present situation of Wu'an,the green infrastructure network structure is extracted,it is still centered on the mineral resources distribution belt of Wu'an City,Conduct the overlay analysis of interference factors,creating a comprehensive resistance surface for building a green infrastructure network in Wu'an,the network centers,connecting corridors and small sites that constitute the green infrastructure network framework of Wu'an are extracted one by one.(3)The present situation of green infrastructure network in Wu'an is evaluated,mainly from three aspects of the network structure,connectivity and function of the green infrastructure network framework,different landscape pattern index,landscape connectivity index and ecological service value index were selected for analysis and evaluation.It is found that the current green infrastructure network framework in Wu'an lacks the network centers of the northeast and the north and south direction connection corridor quantity is few,small sites are widely distributed,but the area is generally small.