Abstract:

The biomass and its allocation of Artocarpus nanchuanensis seedlings in different age classes were measured and analyzed,and the biomass allometric equations were established.The results showed as follows.With the increase of seedling ages，the biomass and its components of the undergrowth single Artocarpus nanchuanensis increased. The difference of branch biomass was the biggest，and the disparity achieved 4789 times.The aboveground biomass generally allocated in the order of stem biomass>leaf biomass>branch biomass.The stump and coarse roots in different ages seedling dominated the underground biomass,and the average biomass distribution rate of various sizes of roots had the sequence of stump root biomass>coarse root biomass>minor root biomass.As a main part of biomass,the proportion of aboveground biomass in total biomass decreased with the increase of seedling age and finally tended to stabilize.The single biomass and the biomass in different organs were more relevant to basal diameter (D)  than the height (H) and HD2,and a power function model was the better one.The allometric equation of minor root biomass was the worst one,the rest were better,and the correlation coefficient ranged from 0873 to 0989.It indicates that the biomass allometric equations has been established is feasible