| Liquidambar formosana,a genus of the golden plum maple tree Yako maple,is a tall deciduous tree.Maple fragrance into the autumn leaves red,is a famous autumn leaf tree species in the south,can be used as shade trees,road tree cultivation,can also be planted alone or several groups planted in lawns,slopes and pools,or with evergreen species and other autumn leaf tree species planted,forming a bright color,rich layers of autumn leaf landscape.There are fewer colored leaf trees in Hunan,and maple incense has strong landscape value as a native tree species in Hunan.Maple incense is widely distributed in Hunan,and under the result of long-term natural selection,many types of communities have been formed,which present different landscapes in autumn.But at present,no one has evaluated the maple landscape in Hunan,and it is not clear why the differences in maple landscapes of different community types are formed.In this paper,a total of 20 sources of maple landscape in Hunan,based on the SBE method to evaluate the maple landscape,the impact of maple landscape biochemical factors and environmental factors to investigate,experiment and analyze,study the maple landscape seed source variation and the relationship with its own biochemical and environmental factors,maple leaf coloring mechanism for the selection of maple landscape excellent seed resources and cultivation tube protection to provide scientific basis and technical support to better meet the needs of the beautiful Hunan construction of high-quality color tree species.The main findings are shown below:1.The study showed that the landscape factors that contributed greatly to the beauty of maple landscape were leaf X11(34.40%),leaf density X6(21.81%),long-term X5(20.52%),leaf X10(19.91%),and deciduous distribution X7(3.36%).Using the gradual linear regression method,the landscape quality evaluation model of maple landscape is constructed as follows:Y=-1.224+0.195X52+0.23 8X53-0.111X61+0.142X63+0.039X72+0.011X73+0.231X101+0.226X102-0.069X111+0.125X113+0.33X114(R2=0.716,P<0.05)。Based on the established landscape evaluation model,it can be learned that the leaf color of maple is the factor that affects the public’s preference the most,and the dark red maple fragrance of leaf color is popular with more people.To maintain the maple leaf lush density,strong growth,maple fragrance more ornamental.Deciduous distribution is controlled in the case of natural distribution,SBE value is larger,more popular with the masses.The 20 provenances could be classified into five groups by cluster analysis.Ⅰ:Damiaokou Forest Farm in Dong ’an County,Yuelu Mountain Scenic Spot in Changsha,Gutai Mountain State Forestry Farm in Xinhua and Wujianshan State Forestry Farm in Linxiang;Ⅱ:Zhangjiajie National Forest Park,Huangshantou National Forest Farm in Anxiang,Shazipo Forest Farm in Longshan,Chuanyan Township in Dong ’an County,and Paileshan National Forest Farm in Jingzhou;Ⅲwere three provenances:HeFuku Forest Farm of Changde City,Hongqi Village of Shuitian Ba Town of Longshan City,and Heye Town of Shuangfeng County.IV:Sangzhi Badagongshan Town,Wulingyuan Zhushitou State Forestry Farm,Cilijiangya State Forestry Farm and Xinzhai Village of Longshan Nonghe Town;V:Lianyuan surrounded mountain forest farm,Rucheng Daping state-owned forest farm,Lengshuijiang Maoyi state-owned forest farm,Chenzhou Wugaishan state-owned forest farm four provenance.According to the average value of beauty Ⅰ class Ⅰ>Ⅲ>Ⅴ>Ⅳ>Ⅱ.2.Chlorophyll a,chlorophyll b and maple landscape SBE values showed a significant negative correlation,carotenoids and SBE values showed significant negative correlation,phytochrome glycosides and SBE values showed a significant positive correlation,soluble sugar and SBE values showed significant positive correlation.3.There was no significant correlation between the average temperature and the maple landscape SBE value,the day and night temperature difference was significantly positively correlated with the SBE value,and the elevation was significantly positively correlated with the SBE value.4.There is an influence between the environmental factor and the color rendering mechanism of the blade.The effect trend of day and night temperature difference and altitude on chlorophyll a and b was basically the same,with a significantly negative correlation,a significant positive correlation with phytochrome glycosides and soluble sugars,and no significant correlation with carotenoids.There was no significant correlation between average temperature and biochemical factors.With the increase of altitude,the content of chlorophyll a,chlorophyll b decreased,the content of phytochrome glycosides and soluble sugar increased,the higher the content of floral pigment glycosides in maple leaves,the redder the color presented,the higher the corresponding beauty value,on the contrary,the lower the altitude,the lower the content of pigment glycosides and other pigment content increased the leaf color more yellow.The effect of day and night temperature difference on leaf inclusions is similar to altitude.Maple leaf color changes under the combined action of many factors,pigment composition and proportion,sugar,temperature,altitude are all important factors affecting the color of leaves.5.Through the analysis of maple landscape evaluation model,combined with landscape element analysis,four sources with high public preference can be selected,namely:The ancient Taishan state-owned forest farm in Xinhua County,Yuelushan Scenic Area in Changsha City,the Da Templekou Forest Farm in Dong’an County,Yongzhou,and the state-owned forest farm in Wushan Mountain in Linxiang City. |
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