Evaluation Of Plant Community Composition And Ecological Benefits Of Urban Greenway

When human history entered the age of industrial society due to the Industrial Revolution,cities developed,expanded and expanded rapidly.In the process of rapid industrialization and urbanization,a series of ecological and environmental problems have also been brought.Urban greenways not only have multiple functions in the overall space of a city,but also can use a small space to optimize and improve the entire urban space.This study selected 30 sample plots among 10 urban greenways in Minhang District.The middle cover types of the sample plot include evergreen broad-leaved forest,deciduous broad-leaved forest,evergreen broad-leaved and deciduous mixed forest,evergreen coniferous forest,coniferous broad-leaved mixed forest and deciduous shrub vegetation types.Both the multi-layered type("tree-shrub-grass" type)and the doublelayer type("tree-shrub" type,"tree-grass" type and "shrub-grass" type)of the vertical structure pattern of the greenway plant community.Field investigation of the structure,quantity,characteristics and diversity of the plant community in each sample plot,determination of the sample plot's five ecological benefit indicators for adjusting the microclimate,providing negative oxygen ions,reducing airborne particulate matter,reducing noise and preventing wind.The study uses these measured values to combine the structure of greenway plants to establish an ecological benefit evaluation system,discuss the relationship between greenway plant communities and the degree of impact of greenway ecological functions,and provide science for the improvement of greenway ecological benefits and the collocation of plant communities in the future basis.The results showed that the overall species diversity of coniferous and broad-leaved mixed forests and evergreen and deciduous broad-leaved mixed forests performed well.The species richness index,Simpson diversity index,Shannon-Wiener diversity index and species evenness were all Higher,and the tren?????among the four are consistent.The overall performance of the species diversity of deciduous shrubs is poor among the six types of plant communities.In terms of vertical structure,the species richness index"Qiaoshrub-grass"type performed the best,followed by"shrub-grass"type and"Qiao-shrub"type,and"tree-grass"type performed the worst in plant diversity.The other three index tren?????are consistent with the species richness index.The communities of different vegetation types in the comprehensive index of urban greenway ecological function are as follows: "Evergreen and deciduous broad-leaved mixed forest" > "Deciduous broad-leaved forest" > "Evergreen broad-leaved forest" > "Evergreen coniferous forest" > "Needle Leafy broad-leaved mixed forest" > "deciduous shrub forest".The communities with different vertical structures are as follows: "Qiaoshrub" type> "Qiao-shrub-grass" type> "Qiao-grass" type> "shrub-grass" type.