| In In the process of development and construction of expressway,it has caused certain damage to the ecological environment,and the greening and restoration of expressway is imperative.Tree species are the main body of high-speed greening.Selecting appropriate tree species can not only repair the greening,but also enhance the beautification effect of greening,and achieve twice the result with half the effort.This thesis takes the representative functional area of Guyuan maintenance section of Zhangcheng expressway as the research object,including the central separation belt,service area green belt,roadside slope green belt and interchange green belt.By consulting literature and preliminary planning and design drawings,understand the tree species allocation planning in each functional area;Collect the data of greening tree species in2019,investigate the preservation rate of greening tree species in 2020 and 2021,and analyze the survival status of the same tree species in different functional areas;Combined with the local reality,this thesis analyzes the problems existing in the selection and application of tree species,and puts forward countermeasures and suggestions.The main results are as follows:1.Pinus sylvestris var.mongolica,Ulmus pumila,Syringa Liaodong and Syringa Alba are widely distributed in the greening areas of the whole line.Pinus sylvestris and Syringa Liaodong have strong adaptability to the site conditions of the study area and are suitable for planting in various functional areas;Guyuan interchange area,136.988 ～ 137.427 section and 153.200 ～ 153.630 section are more suitable for the growth and breeding of white clover.The larger the stake number along the expressway,the more suitable for the planting of white clover;The preservation rate of white elm in Guyuan interchange area is higher,and that of Chinese pine and white birch in lianhuatan east area is higher,but they all fail to meet the qualified standard;The preservation rate of Ulmus pumila,medlar and apricot is low,and there are no surviving seedlings of steamed bread willow and four seasons rose,which is not suitable for planting in this study area.2.Make clear that there are relatively few greening tree species in Guyuan section of Zhangcheng expressway,there are not many plants for flower viewing,fewer plants for fruit and leaf viewing,the greening form is monotonous,the landscape local characteristics are not prominent,the application of tree species is unreasonable,the distance along the highway is long,the management is difficult,and the maintenance is difficult to be in place.3.It is suggested to increase the application of local tree species such as seabuckthorn,mountain peach,Salix psammophila,mountain jujube and hazelnut,take evergreen tree species such as Pinus sylvestris and Cotinus Alba as the landscape tone,use deciduous tree species such as apricot and mountain peach and flowering shrubs such as roses and seabuckthorn in all seasons to decorate,and match the ground cover to form a three-dimensional greening mode;Improve the maintenance management level from the aspects of maintenance capital investment,equipment,personnel,etc.,and form a good effect of high-speed greening landscape.This time,the application status of tree species in the greening project of Guyuan maintenance section of Zhangcheng expressway is analyzed and studied,which provides a certain reference value for the optimal allocation of the greening project of the whole Zhangcheng expressway. |
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