Based on the field data of 18 plant communities and the estimated data from 1013 forest inventory plots, biomass and NPP(net primary productivity) of major vegetation types on the Tibetan Plateau were analyzed. The results indicate as follows:(1)In alpine Picea Ahies forest. the total live biomass is more than 300 t/hm 2 in general, with maximum up to 1600 t/hm 2,The leaf biomass is from 8 to 40 t/hm 2; the rate of the underground to aboveground live biomass is about 0 1～0 2,and the NPP is 8～13 ...