Comprehensive Evaluation And Optimization Of Urban Green Space System In Alpine Region

Urban green space system in the social and economic development,urban ecological environment development cannot be replaced,including ecological function occupy the first place,also have meet the needs of the people daily life landscape function and social economic function.The comprehensive evaluation index system of urban green space system plays an important role in the comprehensive scientific evaluation of urban green space system.China's western terrain is complex,the city is in different natural geographical environment,the city construction is more complex,the eco-city construction has more strict requirements on the urban green space system.This article is to high altitude city,in daocheng county city center,t he study,for example,through the scientific and comprehensive index system building,and on the basis of the evaluation,as the research area of urban green space system planning,construction,implementation and development of a leading role.Targeted the establishment of the plateau urban green space system,make the comprehensive function of the urban green space system in the future of the plateau ecological urban construction to obtain the very good play,make up for a lack of plateau urban ecosystem vulnerability.According to the interpretation of the geographical information image of Daocheng County in 2017,the urban green space system of Daocheng county is divided into five types: park green space,affiliated green space,protective green space,green space production and other green space.The largest area of production green space is 73.40% of the urban green space.The percentage of green space and attached green space is 1.04% and 9.36% respectively.The attached green space is relatively scattered,the degree of fragmentation is large and the small patches are large;the production green space is relatively concentrated,the landscape richness is single,the park green space is relatively regular,but the correlation is poor.(1)The comprehensive information database of urban green space system of daocheng county was establishedAccording to the geographical information image of daocheng county in 2017,the urban green space system of daocheng county is divided into five types: park green space,affiliated green space,protective green space,production green space and other green space.Among them,the area of production greenbelt is the largest,accounting for 73.40% of urban greenbelt,and the percentage of park greenbelt and affiliated greenbelt is 1.04% and 9.36% respectively.The affiliated green area is relatively dispersed,with a large degree of fragmentation and a large number of small patches.The production greenbelt is relatively concentrated,and the landscape richness is single.The green space in the park is regular in shape,but has poor correlation with each other.(2)Comprehensive evaluation of green space system Applying the landscape design,urban design science,ecology,environment art discipline determined 18 indexes such as factor using the analytic hierarchy process(ahp),and established the comprehensive evaluation system in the studied area index analysis and calculation and evaluation,it is concluded that urban green space landscape system efficiency index is 0.3649,the local tree species,species richness of less,landscape diversity,park green space area of low per capita;The ecological benefit index is 0.5106,and the amount of dust and urban noise reduction in green area system is insufficient.The economic benefit index is 0.1245.The construction of green space system has been recognized by the public and society,and the social benefit of urban green space system is relatively good.(3)Analysis of landscape patternThe landscape patches,landscape corridors,topography,landform and visual landscape in the central urban area of daocheng county were analyzed,and the results showed that:The central building density of the research area is large,and the green area of affiliated green space and protected land is small.There is no visual impact point or landscape with ornamental significance.(4)Landscape pattern optimization of green space systemBased on the above comprehensive evaluation and analysis results,the urban green space system in the central urban area of daocheng county was designed,and the urban green space system of daocheng county was designed with "one ring and one axis and two multi-corridor roads connected by mountains and waters",so as to form the urban green space system that can be circulated by mountains and rivers.