Abstract: Based on the biomass data from stem and branch analysis of 95 trees in 19 sample plots, with different ages and densities of larch(Larix olgensis) plantation as study object, the relationship between different factors (diameter at breast height, tree height, crown, etc.) and individual tree components (stem, branch, leaf) biomass was studied, and the regression models for various parts of biomass of individual larch were established using statistical analysis software. The regression models were used to estimate the total biomass of larch plantation stand. Variation of stand biomass in different ages and stand densities was analyzed. It showed that stand biomass increases with age, the proportion of stem biomass is the largest, which also increases with age continuously, but the proportion of biomass of branches and leaves is relatively small. Stand biomass increases with stand density. Finally, stand biomass model for larch is established. The results provided basic information on larch plantation for research and scientific basis for its reasonable management, facilitated the understanding of the productivity of larch plantation.

Key words: Larix olgensis, plantation, biomass, model