Aesthetic Evaluation And Optimization Of Three-Dimensional Greening Landscape Of Roads In Yinzhou District, Ningbo City

With the rapid development of the city,the problem of urban land has become more serious,the urban green area accounted for less,the traditional urban greening has not been able to meet the needs of urban greening and beautification.Stereoscopic greening not only has the function of purifying the air and beautifying the environment,but also has the advantages of occupying less land,fast effect and high greening rate,so it is imperative to vigorously develop stereoscopic greening.This paper takes Yinzhou District,Ningbo City City,Zhejiang Province as an example,and selects 43 roads and 7 squares in Yinzhou District,Ningbo City City,based on the field research data of road three-dimensional greening.The plant composition,ornamental characteristics and application forms are analyzed,and the hierarchical analysis is applied to make a comprehensive evaluation of the plant landscape units,summarize the problems of the current situation,and propose optimization strategies.The main research contents and results are as follows:1.Field research on some road green areas in Yinzhou District,Ningbo City City,statistics yielded a total of 117 species of plants,belonging to 54 families and 90 genera.Of these,3 families and 3 genera of ferns,2 families and 2 genera of gymnosperms,and 49 families and 85 genera of angiosperms,with ferns and gymnosperms being relatively little used,the sum of the two accounting for only 9.26% of the total,and 90.74% being angiosperms.The application form of three-dimensional road greening mainly includes bridge column greening,guardrail greening,wall greening,three-dimensional flower beds,three-dimensional flower boxes and other forms,of which the three-dimensional flower boxes are most widely used.2.The evaluation criteria are constructed in three aspects: aesthetic value,ecological quality and functional value,and 10 visual value evaluation indicators are selected to build a road three-dimensional greening landscape visual value evaluation system,using hierarchical analysis(AHP)to analyze the influence of evaluation indicators on the visual value of the landscape.There are 4 sample points with evaluation level I,13 sample points with level II,9 sample points with level III,2 sample points with level IV and 2 sample points with level V.In general,the quality of stereoscopic greening sample points is mostly in the middle level.3.The following main problems exist in the three-dimensional greening landscape of roads in Yinzhou District,Ningbo City: the application frequency of individual plant species is high,and the phenomenon of landscape homogenisation is relatively obvious;the total amount of three-dimensional greening is low;the form of three-dimensional greening is not rich enough;and the level of plant maintenance is not high.According to the construction status quo and the principle of three-dimensional greening construction,the corresponding enhancement strategies are proposed: enriching plant species;optimising plant species and configuration mode;controlling the application of seasonal flowers;introducing new technology of three-dimensional greening;strengthening the management of plant maintenance at the later stage;combining with road functions to co-ordinate long-term planning,etc.Finally,five types of samples are selected for the optimisation of road three-dimensional greening landscape design.