Research On Tree Species Diversity And Green Space In Built-up Area

The diversity of tree species in urban green land is an important embodiment of the urban greening level and an important part of the urban ecosystem.Since Lu'an City set out to create a national garden city,it has paid more attention to the diversity of green space.In order to objectively understand the characteristics of tree species composition and tree species diversity index in Lu'an City,and to achieve improvement of landscape quality in Lu'an City,also provide data analysis and reasonable suggestions,we submit this study.This study selected 150 sample plots in the built-up area of Lu'an City for field investigation and calculations.The diversity index values and data were compiled to analyze the tree species composition structure of various types of green space,and the importance and diversity characteristics of the overall tree layer and green space type green space trees in the built-up area were evaluated,and the landscape quality was achieved for the built-up area of Lu'an City with data analysis and reasonable advice.Through the analysis and research on the tree species diversity in the five green areas in the built area of Lu'an,the conclusions are as follows:1)There are 118 species of green land in the built area of Lu'an,belonging to 44 families and 81 branches.It contains 87 kinds of arbors,belonging to 34 families and 62 genera,and 58 kinds of shrubs,belonging to 26 families and 42 genera.About the tree species,the ratio of arbor to shrub is 1.3:1.About the number of trees,the ratio of arbor to shrub is 1:2,and the ratio of evergreen and deciduous trees is 1:1.9.2)There are 68 species of native trees in the study area,belonging to 33 families and53 genera.The proportion of native trees and exotic trees is 1:1.2,native trees account for 31%,and the proportion of local tree species in arbors is 59%.3)The important value span of each type of green space is relatively large.The dominant tree species in the arbor layer and the shrub layer are concentrated in 1 to 3species.The types are few,and the species composition is simple.Among the important values of arbor layer,the Camphor tree had the largest value,and the osmanthus tree and the heather tree had obvious advantages in arbor layer and shrub layer.4)The diversity indexes of different types of green land are different.The overall performance is tree layer more than shrub layer.The order of the diversity of tree layers of various types of green space is park green space,other green space,protective green space,affiliated green space,production green space.The order of shrub layer is parkgreen space,affiliated green space,other green space,protective green space,production green space.The Simpson index and Shannon-Wiener index of the same type of green land show a consistent trend.