Research on the aboveground biomass of Pinus tabulaeformis

Based on the survey of 30 Standard-plots in CaiJiachuan River basin,the biomass of Pinus tabulaeform was studied.The results of the study showed as following: Diameter at breast height(DBH) can be better used for the measurement of biomass of the whole plant,stem and branches,then built biomass estimation models of the whole plant and organ based on DBH.The average biomass of different parts of Pinus tabulaeform were: stem' branches' leaves'.Of which,the average biomass of stem was 63.82%,the average biomass of branch was 26.47%,the average biomass of leaves was 9.72%.Slope aspects affected the aboveground total biomass,also affected the distribution of aboveground biomass.Pinus tabulaeformis' crown width area had effect on the biomass of the whole plant、stem,branches,leaves,tree height and DBH: As the crown width area increased by 1㎡,the biomass of the whole plant increased 1.842 kg,biomass of the trunk increased 0.941 kg,biomass of the branch increase 0.704 kg,biomass of the leaves increased 0.196 kg;The DBH increased 0.149cm and the height of trees increase 0.08 m,while the crown width area increased by 1 m2.Pinus tabulaeformis' crown width area had no effect on organ biomass distribution.