Study On Three-dimensional Greening Landscape Design Of Urban Street Space Under Ecological Concept

With the increasing shortage of urban green space,we should give full play to the limited green space resources and realize the urban ecological balance,from plane greening to three-dimensional greening.Three-dimensional greening can not only improve the green space system of a city,but also have a very far-reaching impact on the ecology,image and economic benefits of a city.The purpose is to expand the urban green space on the limited land resources and build a multi-level urban ecological system.First of all,relevant data collection and case investigation are carried out.Data collection mainly includes literature search,Internet search,attention to domestic and foreign relevant policies and the application of new technology,as well as relevant case reference,etc.,focusing on the significance of three-dimensional greening of urban streets.The research is mainly conducted by visiting,photographing and recording the site in the research area.Secondly,the paper analyzes the influence of traditional greening and three-dimensional greening on local climate in Xi’an,Shaanxi Province,and discusses the mechanism of three-dimensional greening on urban ecological environment.Then,by referring to ecological theory,urban three-dimensional greening theory,urban Local Climate Zone（LCZ）,and based on the methods of national climate detection,envi-met simulation and field independent measurement,a research sample site in the east section of Jianshe Road in Beilin Forest district,Xi’an City was selected.The influence of different greening types on climate factors such as site temperature,humidity,CO₂concentration and wind speed was analyzed.The comparison between traditional greening and three-dimensional greening was made by using grid analysis,and the numerical difference of each influencing factor was sorted out.In addition,the improvement effect of three-dimensional greening on urban ecological environment was discussed by analyzing the factors that greatly affected climate.Finally,based on this,taking the street of Beilin District of Xi’an as an example,the paper discusses the three-dimensional greening design of the street,so as to realize the effective utilization of the street space and achieve the street space design that can improve the urban ecological environment.Based on the discussion and analysis of the three-dimensional greening of urban streets in Beilin District of Xi’an city,this paper studies its influence on the urban ecology to different degrees.On this basis,according to the corresponding theory and practical strategies,the street is constructed with fine greening and gives the street characteristics.At the same time,the three-dimensional greening form will be carried forward,show regional characteristics,and make practical guiding significance for street three-dimensional greening design.