Analysis Of Four Typical Community Structures And Its Growth Characteristics Of Empetrum Nigrum Var.japonicum

Empetrum nigrum var.japonicum is a national level two protected plant,is the highest level of protective plants in daxinganling,it has not been studied much,the existing data are mostly to study its chemical composition,medicinal value,seed germination.In this study,the typical community of the growth distribution of the Empetrum nigrum vav.japonicum forest region of Daxinganling was selected to study the community characteristics and the growth characteristics of the Empetrum nigrum var.japonicum in different communities,so as to provide scientific basis for the protection and utilization of the Empetrum nigrum var.Japonicum The main findings are as follows:(1)Empetrum nigrum var.japonicum is distributed in four communities of Betula fruticosa community,Finus pumila Community,Pinus sylvestris var.mongolica community and Larix gnelinii community.The species of Pinus sylvestris var.mongolica community were abundant,a total of 15 kinds of vascular plants were recorded,belonging to 10 subjects and 13 genera,followed by the Larix gnelinii Community sample,a total of 13 vascular plants were recorded,and 9 genera and 11 genus were recorded,and 10 species of vascular plants,belonging to 7 subjects and 9 genera in community sample,were recorded in 9 species,Belonging to 7 sections and 9 genera.In the four communities,the population of the Empetrum nigrum var.japonicum has significant advantages in the lower layer,and the cranberry is a common associated species.(2)The distribution range of trees in Betula fruticosa community,Pinus pumila Community and Pinus svlvestris var.mongolica community was 2cm?12.9cm,2cm?16.9 and 2cm?36.9cm respectively,and the diameter distribution was inverted"J" type,mainly in the path order trees,and the tree diameter structure of Larix gnelinii community was near normal distribution.The diameter distribution range is 2cm?18.9cm,which is dominated by medium diameter order trees.The high distribution range of tree trees in Betula fruticosa Community,Pinus pumila Community and Pinus sylvestris var.mongolica community was 1m?7m,1m?9m and 1m?17m,and the height distribution of trees was inverted "J" type,and there was serious deficiency phenomenon,mainly low height trees,and the height distribution of tree.Trees in Larix gnelinii community was more uniform,the distribution range was 1m?14m,Trees are distributed in the medium and small height range.(3)The tree species of each community were single,and the richness Index and diversity index of shrub layer were larger than that of arbor layer.Betula fruticosa community and Pinus pumila community were shrub communities,which did not form obvious arbor layers,and the evenness index of Arbor layer and shrub layer was 0.71?0.93.(4)There are three ways of growth of Empetrum nigrum var.japonicum branches:Prolonged growth,clustered growth,axillary growth.In the whole illumination area,Empetrum nigrum var.Japonicnm is mainly the way to prolong the growth,while the shading area is mainly clustered growth mode.(5)The growth of the long,branched,leaves and leaf width in the Empetrum nigrum var.Japonicum was better than that of the whole illumination area in the shading area of the same community.(6)The growth of annual branches and branches in the Empetrum nigrum var.japonicunz was better in the community of Pinus sylvesaris var mongolica,and the growth was the worst in the Betula fruticosa community.The length of the two-year branches was longer in the community of Pinus pumila,followed by the community of Pinus sylvestris var.mongolica,and the branch diameter was larger in the Pinus camphor community.In the annual leaves of the Empetrum nigrum var.japonicum the growth of Pinus sylvestris var.mongolica community is better,the growth of Betula fruticosa community is the shortest,the width of Betula fruticose community is the widest,the community of Pinus sylvestris var.mongolica is the second,and the leaves of Lasrix gnelinii group are the thinnest.The two-year-old leaves of the Empetrum nigrum vax.japonicum was longer in the Betula fruticosa community,the second in the Pinus sylvestris var.mongolica community,and the inner lobe of Pinus sylvestris var.mongolica community was wider.