Comprehensive Evaluation Of Urban Green Space System And Construction Of Ecological Greenland System Based On RS And GIS

Urban green space system is a modern city can be recycled,renewable development of the core factors in the ecological function we have the primary position,but also have to meet people's basic needs of the economic and social functions,is the development of human society,modern city sustainable,The ecological environment of the city can be recycled identification and core protection.The construction of the comprehensive evaluation index system plays a vital role in the scientific decision of the urban green space system in all directions.All-round,scientific and accurate evaluation index system as the same as the standard,for the construction of urban ecological green space to specify the direction of development,has a guiding role.And thus targeted to build urban ecological green space system,so that the urban green space system of the composite function to all-round play.In this paper,the remote sensing images of Xi'an city were analyzed and interpreted by using RS and GIS technology as the target area,and the database of comprehensive data of urban green space system in Xi'an was constructed.Based on the Delphi method and the analytic hierarchy process,this paper chooses the greening quantitative,landscape pattern,structural features,ecological benefits,social benefits and economic benefits of the urban green space system from the urban green space system landscape structure and the comprehensive benefit of the urban green space system,This paper chooses 33 evaluation index factors to construct the comprehensive evaluation system of Xi'an green space system.Through the comprehensive calculation,quantification,comparison and evaluation of each index factor,the existing problems of green space system in Xi'an are analyzed,And on thisbasis,put forward the construction plan of ecological greenbelt system in Xi'an.Research indicates:1.Establishment of Xi'an city green space system comprehensive information database According to the interpretation of remote sensing images in Xi'an in 2016,the urban green space system of Xi'an is divided into five types.Among them,the percentage of green space and green space is 22.34% and 21.57% respectively,but the degree of fragmentation of protective green space is relatively high,which is mostly small Green patches,the production of green is relatively scattered and more scarce.Park green area of the percentage of 13.31%,the shape is more structured,but the relative dispersion of the park and poor connectivity;other green space accounted for about4.13%,construction is more scarce.2.Comprehensive Evaluation of Urban Green Space System in Xi'anThrough the calculation and evaluation of the comprehensive evaluation system,the comprehensive evaluation value of urban green space system in Xi'an is 0.6628,and the construction level of urban green space system is generally.The index value of urban green space system is 0.6354,and the comprehensive benefit index of urban green space system is 0.6970.among them:The greening area of urban green space system is 0.7549,the area of urban green space is still to be improved,the green area of Habitat Park does not meet the national requirement.The landscape index of urban green space system is 0.5094,the landscape fragmentation degree of green space system is high,the ecological corridor construction is insufficient;The urban green space system structure characteristic index value is 0.7500,the greenland system plant community construction needs to be strengthened,the green system configuration structure is not reasonable;the urban green space system ecological benefit index value is 0.6593,the green system carbon fixation capacity,the sewage absorption capacity and the dust The urban green space system social benefit index value is 0.9556,the green space system construction has been recognized by the public and the society,the social benefit of the urban green space system is better;the economic benefit index value of the urban green spacesystem is 0.4108,the urban green space system has the social benefit index,The value of carbon sequestration and carbon enrichment in the green space system is lower than that of the pollutant absorption capacity,and the economic benefit needs to be improved.3.Construction of ecological greenbelt system in Xi'anBased on the comprehensive evaluation results,on the basis of this,the paper puts forward the planning and construction plan of Xi'an ecological green space system,which is one screen,two net,three axes,four rings,five pieces and many points,Water,livable,ecologically sustainable,environmentally sustainable urban ecological green space system.