Invesitigation And Analysis On Artificial Plant Community Landscape In City Exhibition Garden Of The Third Guangxi (Nanning) Expo Park

As an emerging urban park green space,the Urban Expo Park is not only an important window reflecting the humanistic style of the city,but also an important carrier of urban ecological environment and urban life.As the main component unit of the green space of urban exhibition garden,it is important to study how to construct artificial plant communities scientifically for creating a harmonious living environment.This paper takes the artificial plant community in the urban exhibition park of Nanning Expo Park as the research object,conducts field survey by sample method,quantifies its species composition,community structure,species importance value and diversity measurement by statistical analysis,summarizes the characteristics and configuration mode of the human plant landscape in the urban exhibition park,elucidates the shortage of plant landscape in the urban exhibition park area,and provides an opportunity for the urban exhibition park and the same.This paper provides a reference basis for the construction and optimization of artificial plant communities in urban exhibition gardens and similar types of garden expositions,and provides a practical basis for the creation of distinctive,harmonious and beautiful plant landscape spaces in exhibition gardens.The main findings of this paper are as follows:(1)In terms of plant species composition,a total of 228 species of 168 genera in 73 families of vascular plants were counted in the urban exhibition park,with angiosperms dominating,plant species concentrated in oligotrophic and monocotyledonous families,with evergreen arbors as the main living type and containing more flowering and foliage plants,and the plant landscape showing the main characteristics of evergreen and flowering in all seasons.The ratio of plant native species to exotic species was 1.1:1,and the application of exotic introduced species had obvious characteristics.(2)In terms of community structure,the horizontal structure was dominated by evergreen broad-leaved forests and mixed evergreen deciduous broad-leaved forests,while the vertical structure was dominated by arbors,shrubs and grasses,and the stand types were mostly concentrated in patches and patches of plant communities.The overall community depression was in the upper middle class,with medium-depressed and dense forests dominating.66.21% of the plants in the park were in good health or above,and the similarity of each community was at a low level,showing extremely dissimilar or moderately dissimilar characteristics.(3)In terms of species importance and diversity,ficus trees and palms were more prominent in the arbor layer,flowering shrubs and foliage plants were dominant in the shrub layer,and herbs were concentrated in Zoysia pacifica and Ophiopogon bodinieri.The shrub layer had the highest species diversity index at all levels.Among the different site types,the overall diversity of the plant communities in the perimeter of blocks and buildings was higher,while the overall diversity of the aquatic plant communities was lower.Among the different vertical structures,the overall diversity of arbor,shrub and grass structures was higher,and the overall diversity of arbor and grass structures was lower.Among the different exhibition garden areas,Nanning Garden had the highest species richness index and Wuzhou Garden had the lowest;Baise Garden had the highest diversity index and Wuzhou Garden had the lowest;Wuzhou Garden had the highest evenness index and Fangchenggang Garden had the lowest.(4)In terms of plant landscape characteristics and configuration patterns,the plant communities in blocks and patches showed strong ornamental characteristics with distinct layers,rich plant species and configuration techniques;the plant communities around the buildings reflected the characteristics of high depression,tight structure and rich vertical ornamental surface landscape;the wet plant communities focused on the use of shrub and herb layers to create a sparse waterfront space;the aquatic plant communities were dominated by single-layer grass structures,emphasizing the application of ornamental grasses;in terms of configuration patterns,five types of configuration patterns and eight specific configuration combinations were summarized.It can be seen that the plant communities in urban exhibition gardens will show different diversity and landscape effects depending on their locations and differences in node theme expression.In the course of the survey,it was found that the urban exhibition garden plant landscape has not distinctive regional characteristics,the application of plant biased species,landscape effects were not uniform,the lack of maintenance and management,the attractions of the guide instructions vague deficiencies.In view of the above problems,we should introduce plants with distinctive cultural connotation,enrich the application of plant species and landscape creation forms,macro-regulate the creation of planting scenery in the exhibition park,increase the later maintenance of plants,and increase the landscape guide infrastructure to highlight the characteristics of plant landscape in the urban exhibition park.