Research On Landscape Plant Communities In Xiangtan Parks

Park's greenbelt,as the city's largest green mass and the recreational areas public participate in most frequently,is the most important part of urban greenbelt system and landscaping environment.Gardening plant community,as the subject and the basic unit of urban park's greenbelt,whose growth status,species composition,community structure and landscape quality determine the exertion of landscaping greenbelt's various function and the face of landscape to a large extent.It is of great significance to build a scientific and rational gardening plant community for enhancing the quality of urban landscaping and creating the harmonious living environment.Based on the traditional theory of plant allocation,the study introduces the theory of community ecology,botany,landscape aesthetics,statistics and other related theories.Through field sampling,mapping,stage fixed observation,photographing,the study depthly investigates 83 gardening plant communities in 9 Xiangtan's parks,and introduced some new quantitative analysis factors suitable to structure and function of gardening plant community,then carried out longitudinal species compositional analysis and horizontal relationship between community structure and landscape quality,intended to provide the basis and guidance for the construction and design of gardening plant community and promote the constructing of urban park greenbelt healthily and efficiently.The main findings are as follows:Concluding that from species compositional analysis :(1)The species richness of garden plant community in Xiangtan City is high,which can form a community structure with rich appearance and stable ecological characteristics.(2)Evergreen trees are in the majority,but there are also a small number of deciduous tree and coniferous tree,which can be used to provide a basic guarantee for the seasonal and morphological changes of the community.(3)The ratio of colored leaves,autumn leaves and flowering plants in the community is high,which can guarantee the richness of color and visual impact,rendering the appeal of the landscape picture,but there is little use of plants flowering in summer and autumn,so that the two seasons' landscapes are slightly tedious.(4)The dominated tree is camphor tree,and shrub is camellia japonica.(5)the regular application of shrubs is slightly higher than the natural application;(6)The overall health of the plant is good,also well adapted to the site environment,and the garden conservation level of the urban park is higher;(7)Trees are basically in the growth stage,less trees.From the study of the relationship between plant community structure and visual landscape quality,there are five main factors that affect the beauty degree.According to the contribution value,it arranges in sequence: the quantiy of branches and leaves,the pruning quality of trim trees,the proportion of arbor coverage in shurb coverage,the quantity of plant species and the proportion of color-leaf plant.And the effect of other factors on the quality of visual landscape was not obvious.Secondly,the influence degree of the three middle layers on the view of the whole community was in the order of plant morphology,spatial level and color matching.Therefore,the posture of the branches of the trees in the multilayer community,the shape of the crowns and the shaped plants Effect,pruning quality should pay special attention.Secondly,for the construction of the vertical hierarchy of the community,it should be that the top is clear and the bottom is dense,the proportion of trees' and shrub's coverage should be maintained at 0.8 below.