Investigation And Evaluation Of Winter Plant Landscape In Yanqing District Of Beijing And Zhangjiakou Of Hebei

As people’s demand for landscapes increases,winter landscapes have gradually attracted people’s attention.The specific geographical environment and climatic factors of the cold cities in our country determine the limitations of the types of garden plants,resulting in a single plant hierarchy,monotonous plant landscape,and insignificant seasonal characteristics,especially in winter.Winter plant landscape in cold cities affects the quality of life of residents,and also limits the speed of economic development to a certain extent.There are few researches on winter landscape in my country at this stage,and the research on winter plants in cold cities is in the initial stage.Through the investigation of winter plants in Yanqing District of Beijing and Zhangjiakou City,Hebei Province,we sorted out and analyzed the types of plants,ornamental characteristics,composition structure and application frequency in winter,and summarized the problems existing in the plant landscape.100 winter plant landscape samples were selected through field investigation,and at the same time,the beauty degree evaluation method（SBE method）and the analytic hierarchy process（AHP method）were used to evaluate the plant landscape of the samples.The main conclusions are as follows:（1）Based on the survey of winter garden plants in Yanqing and Zhangjiakou,we sorted out the winter plant species in Yanqing and Zhangjiakou.There are 120 species of plants,including70 species of trees,（9 species of evergreen tree,61 species of deciduous tree）,32 species of shrubs,and 10 ground covers.Species,8 species of vines.Through the analysis of plant ornamental characteristics and plant color in Yanqing and Zhangjiakou,the results of the two places converged.In the survey samples,the frequency of Sophora japonica application is the most,and the sample C21 is the largest in the species diversity analysis,and the species richness index is 40.（2）Select winter plant landscape factors,assign and score the landscape factors,perform linear regression analysis on the scores through SPSS,retain the factors that have greater influence on the landscape factors,and participate in the construction of winter plant landscape quality models in cold cities.Establish a winter plant landscape model Y=0.973+0.218J1+0.123J5+0.116J7+0.092J8?0.04J9+0.133J10（The J1 is the number of plant colors,J5 is the overall environmental coordination degree;J7 is the plant volume,J8 is ornamental characteristics of plants;J9 is ground cover rate,J10 is conservation status）.（3）Construct an evaluation index system for winter plant landscape,and divide the indexes into target layer（A）,criterion layer（B）and factor layer（C）.The criterion layer has plant landscape aesthetic effect（B₁）,ecological effect（B₂）and visual quality effect（B₃）.Through calculation,the importance is B₁>B₂>B₃,the weight of aesthetic function is the largest,ecological index and visual quality The indicators are second.The importance of each index of the index layer is C₃>C₂>C₅>C₉>C₇>C₁>C₁₀>C₈>C₄>C₆.The representative indicators are color richness of plant landscape,overall environmental coordination,plant species diversity,landscape Comfort,green ratio,plant landscape level richness,landscape stayability,native tree species application,ornamental feature richness and plant health status.（4）By checking the evaluation results of SBE and AHP methods,it is proved that the results obtained by the two evaluation methods have good consistency.SBE and AHP methods are reasonable and reliable for the comprehensive evaluation results of winter plant landscape in Yanqing and Zhangjiakou.Combining the results of field surveys and comprehensive evaluation and analysis,a strategy for optimizing winter plant landscapes in cold regions is proposed.The study of winter plant landscapes in cold cities can provide scientific and effective suggestions and references for the construction of winter plant landscapes in cold cities and regions in my country,which is conducive to the construction of pleasant winter plant landscapes.While improving the quality of life of residents,it can also improve the overall landscaping level of cold cities,establish a good image,and increase attractiveness.