Study On Different Types Of Vegetation Biomass In Beichuan Nature Reserve

Vegetation biomass is one of the indicators of forest ecosystem function has important ecological significance.Researching vegetation biomass, can study balance of energy,flow,nutrient cycling processes functions for ecosystem and provide basic data.This article studied Quercus engleriana,Betula albo-sinensis,Abies faxoniana,Fargesia rufa four types of vegetation in Beichuan Nature Reserve,through field samples investigated and laboratory experiments analysis,biomass models of Quercus engleriana,Betula albo-sinensis,Abies faxoniana,Fargesia rufa,distribution of plant biomass and stand biomass were researched.The results are as follows:(1)Using tree height H,diameter D,and there combinations D2H as the independent variable,by building and biomass model,initially established various organs of Quercus engleriana,Betula albo-sinensis,Abies faxoniana,Fargesia rufa and plant biomass for each 45 models,then through the model evaluate index R2 and test finalized various organs of Quercus engleriana,Betula albo-sinensis,Abies faxoniana,Fargesia rufa and plant optimal biomass model whose fitting degree and predictive accuracy of the model is generally high,strong and practical.(2)By Quercus engleriana,Betula albo-sinensis,Abies faxoniana,Fargesia rufa standard wood (bamboo) resolution,we studied the laws of biomass allocation of each plant. Quercus engleriana that plant biomass allocation pattern as stem> branch>root>leaf,and plant biomass allocation law for the Betula albo-sinensis Abies faxoniana,Fargesia rufa trunks(pole)>roots>branches>leaves.Plant biomass allocation on the trunk (pole) for the largest proportion of biomass, leaf biomass proportion of the smallest.With the increase of plant biomass,the proportion of the various organs of Quercus engleriana,Betula albo-sinensis Abies faxoniana,Fargesia rufa no significant variation,the proportion of branches and tree trunks trend completely opposite,while the proportion of leaves and tree branches changing the same.(3)Quercus engleriana,Betula albo-sinensis Abies faxoniana three kinds of stand biomass obvious differences,Quercus engleriana average biomass is 118.65t/hm2,,Betula albo-sinensis average biomass is 77.86t/hm2,two kinds of stand biomass generally manifested as tree layer>shrub layer>litter layer>herb layer.Abies faxoniana average biomass is 207.48t/hm2,stand biomass manifested as tree layer>shrub layer>herb layer>litter layer.(4)Altitude is one of the principal factors affecting biomass,in Quercus engleriana,Abies faxoniana,Fargesia rufa distribution within altitude,stand biomass first increases with increasing altitude,then decreases with increasing altitude,and separately at an altitude of 1750-1850m,3000-3100m,1800-2000m range up to the maximum biomass.Betula albo-sinensis in its distribution within the altitude,stand biomass increases with increasing altitude,and reaches the maximum at an altitude of 2300m.