Health Evaluation And Analysis Of Roadside Tree In Nanchang Honggutan Central Region

With the rapid development of society, urban environment questions has aggravate increasingly, citizens eagerly want to living in better ecological environment which is created by urban forest containing roadside trees as one of the mainly element.to investigate and evaluate the health situation accurately and timely not only benefit for the greening managers, but also for maintain health development of city ecological environment.The paper investigates12531roadside trees of16major and subordinate roads in NanChang Honggutan central region, analyze structural characteristics in order to overall understanding the present greening and management situation of central region, also, propose a roadside tree healthy evaluation system and apply to the central roadside trees. The main conclusions as follows.(1) Fourteen species belonging to fourteen genera of thirteen families were habitated in the central region, among them Cinnamomum camphora and Platanus×acerifolia were the firstly and secondly frequency used respectively. For a single road, the most amount usage of tree species is seven with four species followed, most road have two to three species. Quantity of Cinnamomum camphora is the most, and the second is Platanus×acerifolia and Citrus grandis. The most tree is on the I grade diameter, which is less on the Ⅱ and lesest on the Ⅲ and IV. For the road plan form, majority form is one plate with two green belts, but major road have abundant forms. Vertical structure of tree species is consistuted by one tree level, then is the two level of tree with shrub or grass.(2) Morphorlogical health situation of tree is as follows in turn, Sapindus mukorossi> Castanea mollissima> Ginkgo biloba> Paulownia fortunei> Platanus xacerifolia> Citrus grandis> Camptotheca acuminate> Firmiana platanifolia> Magnolia grandiflora> Cinnamomum camphora> Osmanthus fragrans> Koelreuteria bipinnata> Celtis sinensis> Elaeocarpus glabripetalus. Among them Sapindus mukorossi, Castanea mollissima, Ginkgo biloba, Paulownia fortunei, Platanus×acerifolia, Citrus grandis, Camptotheca acuminate, Firmiana platanifolia are higer than the average level, Magnolia grandiflora, Cinnamomum camphora, Osmanthus fragrans, Koelreuteria bipinnata, Celtis sinensis,Elaeocarpus glabripetalus are lower than the level.(3) Above-soil environment situation of tree living in is as follows in turn, Ganjiangzhong Road region> Hongguzhong Road region> Fenghezhong Road region> Fenghuangzhong Road region.(4) soil environment situation of tree living in is as follows in turn, Hongguzhong Road area> Ganjiangzhong Road area> Fenghuangzhong Road area> Fenghezhong Road area, and the difference is insignificant between those areas. The whole soil situation is as follows, its PH degree is moderate, containing moderate organic matters, available phosphorus and potassium and lower nitrogen and microbial biomass content.(5) No tree belonging to high quality health grade, over half trees belonging to the healthy grade, amount of trees belonging to sub-health grade, little trees are unhealthy and impending death. Tree health situation is as follows in turn, Paulownia fortunei=Firmiana platanifolia=Citrus grandis> Castanea mollissima> Ginkgo biloba> Osmanthus fragrans> Sapindus mukorossi> Koelreuteria bipinnata> Cinnamomum camphora> Platanus×acerifolia> Camptotheca acuminate> Elaeocarpus glabripetalus> Magnolia grandiflora> Celtis sinensis. Tree health situation in different distrutions is as follows in turn, Hongguzhong Road area> Ganjiangzhong Road area> Fenghuangzhong Road area> Fenghezhong Road area.