Study On Biomass Model Of Branch And Foliage For Larix Olgensis Plantation In Montane Region Of Eastern Liaoning Province,China

Crown is the main organ which trees physiological activities.It is significant that researching biomass of branch and leaf to comprehensive understand biomass of crown.50-year-old Larix olgensis plantation of different density as the research object which in montane region of eastern Liaoning province.In the area 254 branches are effectively collected. The correlations between biomass of each component of the branch biomass (the biomass of branch, foliage and total branch)and basal branch diameter,branch length,the depth into crown are analyzed respectively.The branch volume is introduced into the branch biomass model.Through the comparison and analysis select the optimal model to estimate biomass of branch and foliage,and comparing with the traditional CAR models.Meanwhile, the living vegetation volume of branches based on 3D laser scanning system as the independent variables to establish the branch biomass model.Through the comparison and analysis select the optimal model.This thesis aims at providing basis for accurate estimation and model study of branch and foliage biomass.The main conclusions of the research are as follows:(1)The optimal model of each component of the branch biomass based on the evaluation and validation of the model,in the branch biomass model research which attribute factor of branch as the independent variable.The optimal model of branch biomass is Wb=1793.800L-0.208V,the determination coefficients(R2) of model is up to 0.994 and inspection accuracy is 97.81%;The optimal model of foliage biomass is W1=3387.837(d2L)-0.427V,the determination coefficients(R2) of model is 0.701 and inspection accuracy is 90.36%;The optimal model of branch total biomass is Wbl=1915.682d-0.315V,the determination coefficients(R2) of model is 0.983 and inspection accuracy is 96.50%.(2)The CAR model was introduced into the branches volume.The results show that the branch biomass models,with the branch volume as parameters,are better than the traditional CAR model.The determination coefficients(R2) of branch total biomass model (Wbl/=1915.682d-0.315V) was up to 0.983 and forecast accuracy increased by 2.73%. R2 of branch biomass model(Wb=1793.800L-0.208V) was up to 0.994 and forecast accuracy increased by 9.15%. R2 of foliage biomass model(Wl=3387.837(d2L)-0.427V)was up to 0.701 and forecast accuracy increased by 1.61%.(3)The optimal model of each component of the branch biomass model based on the evaluation and validation of the model,in the branch biomass model research which the living vegetation volume of branches as the independent variable.The optimal model of branch biomass is Wbl=1.128(Vbl)1.306,the determination coefficients(R2) of model is 0.892 and inspection accuracy is 90.75%;The optimal model of foliage biomass is Wb=0.981(Vb)1.403,the determination coefficients(R2) of model is 0.845 and inspection accuracy is 90.19%;The optimal model of branch total biomass is Wl=0.143(Vl)0.991,the determination coefficients(R2) of model is 0.763 and inspection accuracy is 90.47%.