Study On The Overcast Greenland Landscape Of The Viaduct In Luoyang

Although urban viaducts can relieve traffic pressure,they also bring some negative effects to the city.How to take measures to reduce these negative impacts is a hot research issue,and reasonable greening under the bridge is the main measure to reduce the noise around the viaduct and improve the air quality.This paper takes 6 viaducts with different orientations in Luoyang City as the research objects,based on the measured research on the habitat factors such as light,temperature and humidity under the bridge,and combined with the results of the investigation and analysis of the current status of greening under the bridge,the plant configuration mode suitable for the characteristics of the bridge shady habitat is proposed.Aiming at the problems existing in the landscape under some bridges,suggestions for reconstruction are put forward,in order to provide some theoretical and practical basis for the greening under the viaducts in Luoyang City in the future.The research results obtained are as follows:(1)Light is the most important ecological factor affecting the growth of plants under the bridge.The light intensity under the bridge in the north-south direction is better,and the distribution of light intensity under the bridge in the east-west direction is extremely uneven.The southernmost side has the highest light intensity and the central area the smallest.;The light intensity on the east and west sides of the bridge under the north-south bridge is approximately symmetrical with respect to the center,the east side is slightly larger than the west side,and the central area is the smallest.The larger the aspect ratio of the bridge body,the stronger the overall illumination of the space under the bridge.Tall buildings or trees around the bridge body can limit the lighting of the green space under the bridge.The isolation seam of the bridge body has an enhanced effect on the illumination in the area of 2-3m directly below it,and has little effect on the illumination intensity of the edge area of the bridge shade.In addition,there is a certain relationship between the temperature and humidity of the space under the bridge and the light intensity.(2)There are 16 species of trees,15 species of shrubs,1 species of climbing plants,and 6 species of herbs,belonging to 26 families,36 genera,38 species,22 species of evergreen plants,and 16 species of deciduous plants.The plants under the Wangcheng Avenue viaduct and the Chanjian Avenue viaduct are rich in species and highly ornamental,while the overcast landscape of the Gucheng Road viaduct is poor.The common problems of greening under bridges are: single color,rough arrangement of plants,and failure to create landscapes under bridges according to the degree of shade tolerance of plants and the distribution characteristics of shade and light under bridges.(3)Through literature comparison,51 plant species that may be suitable for greening under bridges in Luoyang City were screened out.It is suggested that the plant configuration under the bridges in the north-south direction should adopt a symmetrical layout,and the natural point-like landscape should be built under the bridges in the east-west direction.