Study On Tree Species Planning Of Garden Green Space In Taiyuan City Based On Evaluation Of Ornamental Characteristics

With the rapid development of urbanization,the requirements of urban landscaping are more prominent,and the requirements for the rationality and scientificity of urban landscaping tree species planning are higher and higher.The selection and planning of urban landscape tree species is the inevitable choice of urban green space construction.The ornamental characteristics of tree species are the main basis for the selection and configuration of tree species.Through the quantitative evaluation of ornamental characteristics of tree species for different garden uses,it is the basis and practical need to objectively and accurately grasp the ornamental characteristics of suitable tree species in urban green space.Taking the built-up area of Taiyuan City as the research object,this paper uses the method of combining field investigation and basic data consulting to conduct a comprehensive investigation on the application number of tree species in various green spaces,master the local tree species catalogue with ornamental characteristics,and analyze the tree species composition,structure type and diversity.The existing tree species were classified according to the four ornamental characteristics of flower,leaf,fruit and tree shape.The evaluation index system of ornamental value of tree species was established.The evaluation model of ornamental characteristics was established by fuzzy analytic hierarchy process(FAHP).The suitability of ornamental tree species in different plant application forms was analyzed by expert consultation method The structure of ornamental tree species in garden green space of Taiyuan city.The main results are as follows1.By 2019,321 species belonging to 112 genera and 53 families of woody plants with more than 50 trees will be applied in the garden green space of Taiyuan built-up area,including 129 native species and39 naturalized species,103 domesticated species and 41 exotic species,and the local tree index is 41.39%.Among the current applied tree species,the suitability and growth performance of a few exotic species such as Bougainvillea and Acer Saccharum need to be further clarified The species and quantity of woody plants in green space increased significantly.Among them,domesticated species accounted for about 30%of the new species,and their suitability and ornamental performance were good,which played an important role in improving the richness and diversity of tree species;2.According to statistics,there are 103 species of foliage trees,176 species of flower trees,80 species of fruit trees and 139 species of shape plants in the garden green space of built-up area of Taiyuan city.The number and proportion of all kinds of ornamental trees can reach the ideal ratio of arbor to shrub is 1:1.5,except for the shape observation,the other three ornamental species It is important to increase the application range and frequency of I and II shrubs to improve the ornamental richness and quality.3.The results showed that there were 69 species of grade I,108 species of class II,81 species of class III and 54 species of class IV;90 species of foliage species,131 species of flower species,65 species of fruit trees and 66 species of morphological species were in the order of garden green space > attachment Among them,145 species of park green space,117 species of affiliated green space,79 species of protective green space and 112 species of other green space were selected for evaluation of ornamental characteristics of grade I and II.The selection and configuration of the existing applied tree species in the garden green space of Taiyuan city are shown as follows: the urban characteristics are not fully reflected,many species with ecological suitability and high ornamental value are rarely used;the proportion of tree species with different ornamental characteristics in various green spaces is unreasonable and inadequate;the ornamental characteristics of tree species do not adapt to the functional requirements of green land types;the ornamental characteristics of tree species in different green space plant communities are abundant The results show that the richness is not enough,the overall viewing period is short,which affects the ornamental value of green space;the number of suitable naturalized species and introduced ornamental trees is small,and the universality of green space type and spatial distribution is not enough.Based on the above practical problems and the evaluation of ornamental characteristics of tree species,optimization measures should be taken in the selection and planning of tree species in garden green space of Taiyuan City,including the promotion of local tree species with high ornamental value,the matching of ornamental characteristic types,the demand of ornamental characteristics,and the scientific introduction.Three plant community configuration modes of recreational landscape type,protection ecological type and road greening type were proposed.Combined with the function of green space and the ecological suitability and cultivation practicability of tree species,this paper puts forward the suitable tree species planning for different types of green space and different application situations in Taiyuan city.On the premise of ensuring the adaptability and ecological security of tree species,domestication of exotic species such as purple leaf box fruit,torch tree and diamond Begonia should be strengthened,such as Sophora japonica and Euonymus Jiaodong The number of tree species used,continue to improve the richness and diversity of tree species.It provides the basis for optimizing the structure of garden tree species,improving the quality of landscape,and improving the scientificity and rationality of tree species selection and allocation and tree species application planning in Taiyuan.