Analysis And Evaluation Of Plant Community Structure In Waterfront Green Land Of Hefei City

This paper takes the waterfron green land plant communities on both banks of the Tangxi River and Nanhu Lake in Hefei as the research object,from the perspectives of species composition and spatial structure of each plant community,systematic surveys of plot community and determination of ecological benefits of typical communities are carried out.On this basis,the comprehensive analysis of ecological,cultural,economic,social significance,landscape viewing and other aspects,and the use of SBE and SD methods for landscape quality evaluation.Finally,some suggestions for improving the plant community allocation of waterfront green space in Hefei were put forward boldly.Through the research,this paper draws the following main conclusions:(1)There are about 45 families,63 genera and 82 species of plant communities in waterfront green space of Tangxihe Park in Hefei.Among them,the dominant families are Amaranthaceae,Cueurbitaceae,Euphorbiaceae,Rosaceae,etc.The quantity proportion of arbor:shrub:herb is close to 1:1:2;There are about 35 families,45 genera and 51 species of plants in the waterfront green space of Shufengwan Sports Park,among which the dominant families are Pontederiaceae Kunth,Liliaceae,Nymphaeaceae,Celastraceae,etc.The quantity proportion of arbor:shrubs:herb plants is close to 1:1:3;in general,the species richness of Tangxihe Park is greater than that of the Shufengwan Sports Park,but the species richness of the Shufengwan Sports Park within the unit area is relatively large.The proportion of native plants applied in Tangxihe Park is about 68%,the proportion of introduced and cultivated plants is not high,the regional characteristics of plants are distinct,but the number of native plants applied in Shufengwan Sports Park is only 53%.The utilization of local resources is less than that of the former;The ratio of evergreen tree species to deciduous tree species in Tangxihe Park and Shufengwan Sports Park is both close to 1:1,but the proportion of evergreen trees is slightly higher in the data;and the plant community is mainly composed of broad-leaved mixed forest and coniferous and broad-leaved mixed forest.The variation trend of species richness of waterfront green space community in both parks is arbor layer=shrub layer>herb layer,and the trend of qunantity of these 3 layers is also the herb layer>arbor layer=shrub layer.There are 2 main types of community spatial structure in the two parks:three-layer structure and two-layer structure,covering 4 kind of matchig modes:"Arbor+shrub+herb","Arbor+shrub","Arbor+herb" and "shrub+herb",the plant growth condition is generally good.The high frequency of trees and shrubs in Tangxihe Park is as follows:Taxodium distichum(L.)Rich,Nerium indicum Mill,Hibiscus mutabilis Linn,Photinia x fraseri Dress,Osmanthus sp.and the like;High-frequency arbor and shrub in Shufengwan Sports Park are Populus L.,Osmanthus sp.,Taxodium ascendens,Brongn,Pterocarya stenoptera C.DC.and so on.(2)The plant communities in Tangxihe Park and Shufengwan Sports Park in Hefei City increased humidity and decreased temperature,and the ability of reducing noise level was obviously better than that of environmental control.The difference in the level of weakening noise and humidifying and cooling in greenbelt with different canopy density was more significant than that in environmental control.Among them,there are 4 combination models for the communities with better effect of humidification and cooling and strong abatement ability of noise.From the point of view of enriching species diversity,giving full play to the ecological benefit of community and reflecting the regional characteristics of plant landscape,this paper puts forward and constructs a suitable hygroscopic and dewarming type of waterfront green space in Hefei.The configuration pattern of functional plant communities with reduced noise.(3)According to landscape evaluation,the landscape quality of waterfront green space in Hefei was determined to be medium to upper.Among the 10 community plots,6 were highly suitable for landscape quality,accounting for 60%,2 were generally suitable and 2 were barely suitable.The landscape quality of waterfront green space in various urban functional areas is also obviously different.For example,the landscape quality of waterfront green space in residential and cultural areas is very suitable,while the landscape quality of waterfront green land in commercial and industrial areas is generally suitable.The species diversity of the secondary artificial communities investigated in this study is relatively rich,and the internal structure of the population has reached a relatively stable state.The results of this study can be used as technical support for the improvement of the community structure and the enhancement of the function of the waterfront green space in Hefei.It provides scientific theoretical guidance for sustainable development of ecology,society,humanities and economy in Hefei.