Study On Leaf Color Composition And Comprehensive Evaluation Of Main Colored-leaf Tree Species In Lishui City

As a part of plants with great ornamental value,plant color has always been the focus of landscape designers.Especially in recent years,colorful leaf trees with rich leaf color and seasonal changes have been more and more favored by designers in creating beautiful landscape.However,designers are not sure about the specific colors of different seasonal phases of plants,and lack of understanding of the changing laws of plant colors often leads to poor design quality.The application of colored-leaf tree species in Lishui city has developed rapidly in recent years,but there are still some problems such as the introduction and unreasonable allocation of colored-leaf tree species.Therefore,this paper takes the typical urban landscape in Lishui city as a research case,investigates the colored-leaf plant resources and their landscape application on the spot,systematically analyzes the HSV color value of dynamic changes in leaf color,and comprehensively evaluates the landscape color of autumn leaf tree species by using entropy method and gray correlation analysis,etc.,and analyzes and summarizes the problems existing in the application of colored-leaf tree species and their application prospects.In order to provide theoretical reference and reference basis for the application of colored-leaf tree species and landscape design in Lishui city.This paper takes the leaves of 92 woody plants in Lishui area as the research object,taking one year as the cycle,collecting leaf color by spectrophotometer,analyzing the dynamic changes of leaf color of 92 woody plants in Lishui city in different seasons,and constructing the leaf color information system of woody plants in Lishui city.Let the image of the plant landscape design and abstract color design values transform each other,to provide guidance for the further optimization of Lishui plant configuration.The main research conclusions are as follows:(1)There are 92 kinds of woody tree species with leaf color in Lishui city,including 24 native tree species,and there are 10 types of leaf color in Lishui city,which are green,dark green,dark green,orange yellow,yellow,golden yellow,red,bright red,orange red and pink.In terms of various types of colors,yellow and red are abundant,and orange and pink are only one;As far as plant species are concerned,the common colors are green,golden yellow,red,yellow,orange yellow,orange red and bright red in turn.Among them,the rarer ones are pink plants and orange yellow plants.There are 40 species of autumn leaf color trees.Lishui garden plants show bright colors and bright colors on the whole.(2)Trees can be divided into evergreen and deciduous trees according to their habits.There are 47 evergreen trees and 45 deciduous plants in Lishui city.Among them,deciduous yellow plants account for the majority,yellow trees 26,accounting for 28%,red trees 15,accounting for 16%,and deciduous green trees 4,accounting for 4%.There are 47 kinds of evergreen plants,accounting for 51%of the tree species in the whole city.Among them,the color of deciduous plants is mainly red and yellow,while that of evergreen plants is insufficient and has no obvious characteristics.Greening landscape color is monotonous,especially the leaf color changes in spring,summer and winter are not obvious,and the ratio of evergreen plants is significant.According to the research,Lishui city should appropriately increase the proportion of green landscape,especially to reflect the seasonal characteristics,increase the number of colored tree species,especially native tree species,and appropriately increase the number of colored and evergreen tree species to beautify the environment.Based on entropy method and grey correlation analysis,40 autumn leaf tree species which are widely used and have good landscape effects in Lishui city were comprehensively evaluated.according to the score values,the main autumn leaf tree species in Lishui city were divided into three grades,?,? and ?.Among them,there are 13 species of red maple(Acer palmatum 'Atropurpureum')?acacia(Albizia julibrissin)?mandarin jacket(Liriodendron chinense)?locust tree(Sophora japonica)?chinese pagoda tree(Sophora japonica var.japonica f.pendula)?beech tree(Zelkova serrata)?fairy fruit(Ficus erecta var.beecheyana)?purple magnolia(Magnolia liliflora)?pomegranate(Punica granatum)?chestnut(Castanea mollissima)?Second Joe Mulan(Magnolia soulangeana)?ginkgo(Ginkgo biloba)?and chinese tallow tree(Sapium sebiferum)belonging to grade ?,accounting for 32.5%of the total;,belonging to Grade ?,are Maple with chicken feet(Acer palmatum)?Dalbergia odorifera(Dalbergia hupeana)?chinese white poplar(Populus tomentosa)?Pu Shu(Celtis sinensis Pers)?Sassafras(Sassafras tzumu)?Chinaberry(Melia azedarace)?Elms(Ulmus parvifolia)and Guangye persimmon(Diospyros diversilimba),accounting for 22.5%of the total;There are 18 kinds of cherry(Cerasus pseudocerasus)?persimmon(Diospyros)?coral park(Celtis julianae)?phoenix tree(Firmiana platanifolia)?sapindus mukorossi(Sapindus mukorossi)?magnolia(Magnolia denudata)?French phoenix tree(Platanus orientalis)?cherry blossom(Prunus yedoensis)?melia azedarach(Melia azedarace)?phoebe bournei(Machilus thunbergii)?Triangle maple(Acer buergerianum)?sweetgum(Liquidambar formosana)?weeping willow(Salix babylonica)?sweet locust with wings and pods(Cladrastisplatycarpa)?Hovenia dulcis Thunb(Hovenia acerba)?rhus chinensis(Rhus chinensis)?beautiful maple(Acer elegantulum)and bauhinia(Cercis chinensis),accounting for 45%of the total.In a word,the difference of chroma and lightness between autumn leaf colors of garden woody plants in Lishui city is obvious.there are many plant materials to choose from,and the diversity degree of plant species is high,which can be cultivated into a beautiful autumn plant landscape.However,in the study of plant color,it was found that the leaf color of autumn plant landscape in Lishui city was too single,especially the number of colored leaf plants in spring and summer was small and the ornamental value was insufficient.The top priority is to give full play to the existing plant resources and try to introduce some colored-leaf plants from other places for planting so as to beautify the environment and meet people's aesthetic needs.