| The utilization of garden plants in urban gardens can reflect the characteristics of local plants,especially native tree species.In urban greening,the native tree species are mainly native trees,which not only have high ecological value,high ornamental value and easy to be managed in the later stage,but also have certain culture,which can reflect the characteristics of the city.It plays an important role in the establishment of garden ecological city.Mianyang is working hard to build an ecological garden city.However,due to the lack of reasonable collocation of landscaping tree species,there is a single form of greening tree species,and some species with ornamental value and application value are less applied.The selection of tree species did not make full use of the plant advantages,and the new ornamental fruit tree fejoa garden application development and so on.Through the discussion of these problems,this paper tries to lay a foundation for the garden application of tree species and fejoa in the future.In this paper,the species,growth status,ornamental effect and application form of different greenbelt trees in Mianyang people's Park,Mianyang Wu Yi Square and Southwest University of Science and Technology were investigated.The results of comprehensive evaluation and analysis show that there were 132 species of garden plants belonging to 58 families and 101 genera,and 55 species of native trees belonging to 46 genera and 35 families.The relative dominance of native plants in Mianyang is 4 genera and 6 species of legume,2 genera and 4 species of willow,4 species of Oleaceae,3 genera and 4 species of Oleaceae,respectively.They account for 10 or 7 of the existing plants for garden greening.The other native plants belong to genera with an average of 1-3 species,and most of them belong to 1 genus and 1 species.The proportion of deciduous tree species in each greenbelt was larger than that of evergreen tree species and ornamental fruit trees were used in garden.At present,there were not enough species of trees in the application of gardene trees in Mianyang urban area,the local characteristics were not prominent enough,the characteristics of trees were not fully utilized,the form of greening was relatively monotonous,and the proportion of evergreen trees and deciduous trees was not reasonable.The maintenance management work was not in place and so on.According to these questions,30 native tree species and 15 exotic tree species were selected in this paper,respectively from the Growth characteristics,ornamental value,adaptability to the environment,resistance,ecological value,social benefit,economic benefit.The specific optimization measures were put forward: to readjust the key species of Mianyang as local tree species,such as Ficus macrophylla(Ficus virens Ait.var.sublanceolata(Miq.)Corner.),camphora(Cinnamomum camphora(Linn.)Presl.Priorz.),soapberry(Sapindus mukorossi Gaertn.),(Koelreuteria bipinnata Franch.),acacia(Gleditsia sinensis Lam.),Osmanthus fragrans(Osmanthus fragrans(Thunb.)Lour.),maple(Acer truncatum Bunge.),cycads(Cycas revoluta Thunb.),and other exotic trees,such as(Cinnamomum japonicum.),and(Ficus microcarpa.).The main tree species are(Ginkgo biloba L.),(Sophora japonica L.),(Trachycarpus fortunei(Hook.)H.Wendl.),(Liquidambar formosana Hance.),(Celtis sinensis Pers.),(Prunus cerasifera Ehrharf.atropurpurea(Jacq.)Rehd.)(Elaeocarpus decipiens Hemsl.),and exotic tree species,(Cedrus deodara(Roxb.)G.Don in Loud.),Carthophor(Bauhinia blakeana Dunn.)and(Platanus ×acerifolia(Ait.)Willd.).The collocation of evergreen and deciduous tree species should be reasonable,and the principle that native tree species should be dominant and exotic trees should be auxiliary should be applied in different greenbelts according to the characteristics of tree species.Secondly,the comparative analysis of six kinds of shrubs and new ornamental fruit trees was made,and the advantages of Fejoa in garden application were obtained. |
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