| Urban greening tree species is composed of the basic elements of city greening plant communities,Tree configuration of reasonable level directly affects the urban plant community structure.Based on Xuancheng within the scope of the main park green space,green production,protective greenbelt,attached green space and road green space the important value and species diversity index of statistical investigation,Analysis and control Xuan city urban green space system in tree species composition and structure of the status and tree growth status,The results of the study are as follows:1.In the investigation of 260 sample plots,A total of 133 kinds of species,belong to 48 families and 92 genera,Species rich families are Rosaceae,Cupressaceae,Oleaceae,Magnoliaceae and legumes.The more arbor species are Camphor,crape myrtle,wide YuLan etc.the more shrub species are Sweet scented osmanthus,red Shi Nan,Loropetalum etc.2.Park green space and subsidiary green space configuration of tree species overall effect is better,The rich greening tree species,52 species of arbor species and 53 species of shrub species in park green space;The attached green space 47 arbor species,65 shrub species;The road green space and protection green space overall poor,The road there are 25 kinds of arbor species,Shrubby tree only 36,There are 29 arbor species and 32 shrub species inProtective green,Both species and species number of individual trees are low,The protective effect is difficult to play the function of the road greening and protection of green space.3.The park arbor species are more camphor,ginkgo,Du Ying etc.Shrub species is more Malus halliana,osmanthus,Bauhinia etc.In the city park green space distribution is not balanced,The park of good Diversity and High abundance,Such as AoFeng Park,Meixi Park,WanLing River Park and ringMountain Park,are located in the main urban areas of the south,and other parts of the main city is less distribution.4.The protective green tree species is more camphor,metasequoia,poplar etc.Shrub species is more coral tree,Loropetalum,wintersweet etc.The configuration of arbor and shrub in Wanxi River greenway protection forest is better.Other protective green tree configuration is Poor.Species diversity isn't really reflected.Community structure of layers are not expressed.Most belong to passive tree species configuration.Not really consider the nature and function of green space protection requirements.5.The production of green tree species is more camphor,osmanthus tree,etc.Shrub species is more red Shi Nan,osmanthus,Loropetalum etc.The production of green tree species structure unreasonable phenomenon is serious.Tree species is single,The formation of a few evergreen species of green type,ignoring the use of deciduous trees.In the kind Investigation,in addition to Hong Kong International City Nursery,the area is relatively small,less species and single.It is difficult to meet the needs of city greening tree species,green seedlings is still dominated by Foreign Transportation,increased itself seedling mortality and garden construction cost.6.Affiliated green tree species is more camphor,sweet scented osmanthus,wide YuLan etc.Shrub species is more red Shi Nan,osmanthus,Loropetalum etc.Good greening effect of attached green space residential area.Species of arbors and shrubs are more abundant,tree configuration is more reasonable and uniform,The poor effect of enterprises and institutions affiliated green space,The effect of attached green space within the plant even worse.7.The road green tree is more camphor,crape myrtle,wide YuLan etc.Shrub species is more sweet scented osmanthus,Sabina chinensis,Shi Nan etc.In addition to the Yangjiang road greening effect of water well.Other roads have used a lot of camphor trees as green.The configuration of tree species is relatively the same.The lack of road show different characteristics.a few species species and fewer ramets of trees,Not true to the greening effect,are Seriously affected the image of Xuancheng City. |
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