Study On The Planning Of Lanscape Trees In Yimen County Yunnan Province

The planning of landscape tree species is an significant means to guide the construction of city landscape. With the rapid developing of landscape construction in Yimen County, in order to get a rich and colorful landscape, must carry on the comprehensive planning of landscape trees, with the guidance of theories and methods of plant communities, landscape ecology, garden ecology, landscape aesthetics, and landscape trees etc, base on the datas and resources of ancient trees, native tree species and landscape tree species, explore the planning of landscape tree species and provide the basis for construction of ecological garden in Yimen county. The main research results are as follows:(1) There are221landscaping trees species existing in Yimen County, the gymnosperm is20species, angiosperm is201, Among them, there are135species of arbor, ratio close to61.08%,76species of shrubs, ratio close to34.39%,10, ratio close to4.53%evergreen and deciduous ratio is67:33, among them, there are80evergreen arbors, total36.20%,61evergreen shrubs, total27.60%,7evergreen woody vines, accounted for3.17%,55leaves arbpr,accounted for24.89%,15shrub species, accounted for6.79%,3deciduous woody vine, accounted for1.36%there were92local species, all species of alien species have41.63%,129exotic tree species, accounted for58.37%.(2) This paper summarizes some problems in the landscape tree species application of Yimen County. Analyse the species composition and application potential of the33ancient trees and406native trees, also, to explore the utilization potential of introduced species, and promotion type species resources etc.. Also, provides the feasible basis for the planning of landscape tree species in Yimen County.(3) This planning of landscape trees was based on the present application tree species in Yimen landscape, also include ancient trees and native trees. Put forward the guiding ideology, basic principles and planning objective accord to the geographical conditions of Yimen and its natural environment. According to the present landscape tree species definite the trees ratio: gymnosperms and angiosperms is10:90, evergreen species and deciduous species is75:25, arbor and shrubs is70:30, native species and introduced trees is80:20, slow-grow trees, middle-grow and fast growing is40:40:20.A total of472trees are planning for Yimen County. Among them, the gymnosperm is45, angiosperm is427, and192evergreen trees,106evergreen shrubs,14evergreen woody vines,109deciduous trees,44deciduous shrub,7deciduous woody vine,378native trees,94exotic trees. Combining the above, planning4kinds of background tree,16kinds of dominant tree,452ordinary tree. In addition, for the different types of green space planning405species of park green space, and for green area for environmental protection planning82species street trees,129species of green residential area,111tree species for unit of green enterprises,93tree species for hospital,194species for schools, and for industrial area planning32trees resistance to SO2,30kinds of trees resistance to smoke and dust,,27species of resisitance to hydrogen fluoride,26for anti-toxic gas and planning24for factory protection forest,42for road protection forest,34for farmland shelter forest,37for river bank protection planning206for productive plantation area26of vertical greening trees.To select the Ormosia nuda as county tree, Viburnum punctatum as county flower.