Build The Landscape Prediction Model Of Central Greening Belt Of Urban Road Based On Vehicle Observation Angle

The research on the evaluation of road landscape in urban area of our country started late.Landscape evaluation samples used in the related research ware based on the static perspective,which cannot mention in the same breath with the dynamic perspective that most people have when they go down the urban road in vehicle.Besides,evaluation samples chose for the related research ware the best condition of the landscape which is far different form the normal landscape view.Moreover,the affector of evaluation is quantized in artificial way.Thus,the result is of subjectivity and one-sideness.The evaluation samples used in this study came form 30 roads in Nansha District of Guangzhou.In the green belt located in road central,70 different samples are selected as the materials to be evaluated.Field survey was conducted in order to get the basic data of green belt.Which include a series of researches like the investigation on width of road green belt,the structure condition of plant community in green belt,the investigation on plants species and quantities,planting point and maintenance level.The effectors of scenic beauty evaluation form dynamic perspective in vehicle will be proposed.Next those effectors significant correlated to the scenic beauty will be selected after quantization and examination.The linear regression model was established by using stepwise selection method,affectors which have a significant linear correlation with the scenic beauty ware confirmed as independent variables,and the scenic beauty value as the dependent variables.The model is as follows:After the anaylisis of the linear regression model.Several facts are concluded as follow: the structure of plant community and the maintenance level of road green belt contribute the best to the scenic beauty,the second ranking is the tree backway,relative density of green leaf period tree and plant community coverage have certain contribution to scenic beauty values.the total coverage of each layer per unit area could also contribute to the scenic beauty value,the total coverage of each layer per unit length and the interference factor of the pavement contribute less,while the model showed that there was negative linear correlation between the tree layer coverage per unit length and the scenic beauty value.There are few proposals to be offered for making urban road landscape of Nansha District better than actual condition.First,the plants community along the urban road should be thoughtful arranged to achieve multi-layer,which can be realized by using diversity trees and grass.Second,both ever-green tree and deciduous tree should be used in plants arrangement,and the proportion of each kind should be kept in a reasonable range.Third,space used for plants to grow should be taken into consideration by designing plants density rationally.Fourth,indigenous plants should be kept in a significant number while Introduced species are welcome too in order to increase the diversity of plants.Fifth,Maintenance level of urban road landscape should be improved significantly.