Research On The Evaluation And Construction Of Ecological Green Space System In Industrial Cities Based On GIS

Urban ecological green space system is the core and key of urban ecosystem and urban environment construction.Constructing the urban ecological green space system is the key to realize the sustainable development of the city.Industrial development leads to a series of environmental pollution problems in cities.Compared with other cities,the environmental problems in industrial cities are more serious.Therefore,it is particularly important for industrial cities to construct urban ecological green space system.The comprehensive evaluation of urban green space system can reflect the level of urban green space construction comprehensively and accurately,provide theoretical basis and reference for the construction of urban ecological green space system,and guarantee the effective play of urban green space ecological service function.This paper takes the built-up area of zibo city as the research area,interprets the 2019 remote sensing image of the built-up area of zibo city by using GIS technology,classifies and extracts the five types of green space information,and obtains the zibo city green space classification diagram,so as to construct the zibo city green space information database.This study combines analytic hierarchy process(ahp),expert scoring method and fuzzy evaluation method to construct the comprehensive evaluation index system of zibo city's urban green space system,calculate the weight coefficient of each index and conduct comprehensive evaluation.Based on the existing problems and planning strategies of zibo urban green space system,zibo urban ecological green space system scheme was constructed.The research contents are as follows:1.Establish zibo urban green space information databaseBased on the interpretation of the 2019 remote sensing image of the built-up area of zibo city,the green space is divided into five types: park green space,square green space,regional green space,protective green space and affiliated green space.Among them,park green space and square green space account for 9.40% and 5.75% of the total urban green space respectively.The regional green space and affiliated green space account for 35.10% and25.41% of the total green space area respectively,which are dominant in the urban green space system.The protected green space accounts for 24.35% of the total green space area in the city.The green space patches are scattered and the landscape fragmentation is large.2.Comprehensive evaluation of urban green space system in zibo cityBy calculating and analyzing the indexes in the comprehensive evaluation index system,the weight coefficients of each index are obtained.According to the evaluation with the largest value in the fuzzy comprehensive evaluation method as the comprehensive evaluation result,the comprehensive evaluation value of zibo city's urban green space system is 0.3566,that is,the construction level of zibo city's green space system is general.The weight values of landscape structure evaluation and comprehensive benefit evaluation indexes of urban green space system are 0.3333 and 0.6667 respectively.Among them:The weight value of urban green space system greening quantitative index is 0.4905,indicating that the green space area of each type is insufficient and the ratio of park service area does not meet the national standards.The index weight value of landscape pattern of urban green space system is 0.1976,indicating that the landscape fragmentation of green space patches in zibo city is high,and the interference degree of human activities on urban green space landscape is too large.The weight value of the index of plant allocation and network structure in urban green space system is 0.3119,and the planting proportion of local tree species is less,so the rationality of plant allocation in urban green space system should be strengthened.The weight value of the ecological benefit index of urban green space system is0.5714,which indicates that the ecological capacity of urban green space system in zibo city is low,such as carbon sequestration and oxygen release,and mitigation of urban heat island effect,etc.,and the urban environment is seriously polluted.The weight value of the economic benefit index of urban green space system is 0.2857,the value of absorbing toxic gas,conserving water and holding dust is low,and the ecological isolation system is insufficient.The weight value of social benefit index of urban green space system is 0.1429,indicating that social benefit of urban green space system in zibo city is good.3.Construction of zibo urban ecological green space systemGuided by the theory of landscape ecology and landscape pattern theory,based on comprehensive evaluation of zibo city green space system as a result,construct the urban ecological green space system plan of zibo city with "one heart,three corridors,four belts,four networks and multiple points of improvement",and builds a whole "mountain,water,forest,farm,lake,grass,people" ecological integration of urban green space system.