Abstract: As a very special vegetation type in China,Quercus aquifolioides,a type of sub-alpine sclerophyllous oak forest,distributes widely in Hengduanshan mountain in Wolong Natural Reserve.By the methods of field plot investigation and sample tree plot harvesting,the aboveground biomass of 6 Q.aquifolioides communities distributed at the heights from 2 720 m to 3 120 m was studied at Balangshan Mountain in Wolong Nature Reserve.The fitting model with the parameter of diameter (D) or height (H) used to estimate the organs' biomass of individuals was an exponential or a power function model,and the latter was the better one,with the correlation coefficient ranged from 0.941 to 0.988.The fitting model with the parameter of D²H was a linear or an exponential model,and the former was better,with the correlation coefficient ranged from 0.982 to 0.996.The average total biomass of Q.aquifolioides thicket community was 3.3891×10⁴ kg·hm^-2,and the biomass in different layers was decreased in the order of canopy layer > ground litter > associated shrubs layer > lichen> herbage,accounted for 77.92%,17.64%,2.14%,1.23% and 1.07% of the total biomass,respectively. The average total biomass of Q.aquifolioides population was 2.6408×10⁴ kg·hm^-2,and the biomass in different organs was in the order of root > stem > branch > leaf > bark,accounted for 31.03%,29.85%,18.54%,18.54% and 6.91% of the total population biomass,respectively.

Key words: Nature reserve, Buffer zone, Analytic Hierarchy Process