Study On The Colouring Characteristics Of Typical Coloured Leaf Tree Species In Autumn In Hangzhou

In recent years,the construction of colored forests has been carried out in the whole country.The research on color phenology of colored-leaf tree species keeps pace with the needs of the times and has practical significance.In this paper,36 species of colored-leaf tree species commonly found in Hangzhou area are taken as research objects,and color phenology and color ornamental characteristics are studied by using scenic beauty evaluation method,cluster analysis method,tree species color quantitative analysis method,etc.The main conclusions are as follows:1.The survey results show that:The autumn color period of 36 main autumn leaf species begins in early October,most species complete defoliation in early December,and the autumn color period ends.Among them,Sassafras,Cherry Blossoms,Magnolia denudata,Liriodendron chinense and so on,among which Liriodendron chinense,Platanus acerifolia,Pistacia chinensis and Du Ying have the longest viewing duration,reaching about one and a half months.1.The ornamental period of Sassafras and Ginkgo is also more than one month.According to the type of autumn leaf color change,36 tree species can be divided into synchronous color change deepening type,color spot expanding type,color brightening type and color change deciduous cross type.2.The method of scenic beauty evaluation was used to evaluate the individual scenic beauty of 36 autumn leaf trees,and the order of scenic beauty values of 36 trees was obtained.The species with the highest ornamental value are Sassafras,Ginkgo,Acer palmatum and Pinus densiflora.When evaluating the scenic beauty of individual tree species,the photos of four color changing periods were evaluated at the same time.Overall,the scenic beauty value was the highest in the middle and late color changing period,while the scenic beauty value in the early and late color changing period was lower.The model analysis of the impact indicators of scenic beauty shows that contrast plus color tone,uniform crown 1 rate,leaf hanging rate,color number and full-color brightness can be taken as the dominant factors affecting the scenic beauty of tree species in autumn.3.The quantitative classification method is used to cluster tree species according to their scenic beauty values,and further classification is carried out according to the length of viewing period,so that the obtained results are more accurate and true.The 36 tree species were divided into 6 grades,which were classified as excellent(grade ? and ?),good(grade ? and ?)and poor(grade ? and ?).3.Among them,Class I tree species include 2 species,Sassafras and Ginkgo.They are characterized by beautiful autumn scenery and extremely high ornamental value.Moreover,individuals and groups of tree species enjoy longer ornamental days,which is suitable for both solitary and group planting to form magnificent autumn scenery.4.Aiming at the problems of tree species allocation in the process of color forest construction,combining the scenic beauty evaluation and tree species classification results,botanical knowledge and existing related achievements.Summarize the following 6 configuration modes: monochrome,synchronous,main sequence,green bottom,relay and shared appreciation.At the same time,it points out the concrete application plan of the main tree species studied.It provides a reference for plant landscape configuration in autumn...