A Study of Effect of Different Forest Ages on Growth and Biomass Allocation of Masson's pines

Research was conducted on the status of Masson pine's growth and biomass allocation at different forest ages (8 years,20 years,30 years) in Shizhu State Forest Farm of East Chongqing. The results showed that ① the DBH and tree height of Masson's pines grew the fastest at young age (8 years) and the middle age (20 years), the timber volume reached the maximum at maturity (30 years). ② Masson's pine's various organs and total biomass would increase along with the increasing of the stand age,the trunk biomass had the fastest increase velosity,and was the highest at the maturity,reaching 72.68%. ③ Within each Masson's pine age,the sorting of all levels of biomass was as follows:tree layer, litter layer, herb layer,shrub layer; tree biomass and forest floor layers' total biomass would increase with increasing age and had an absolute advantage; shrub, herbaceous layer and litter layer occupying the proportion of the total biomass decreased. ④ The sorting of aboveground net primary productive forces of each Masson's pine layer level at the middle-aged forest was as follaws tree layer,litter layer,herb layer,shrub layer. And yet in young forest and mature forest, the sorting was tree layer > herb layer > litter layer > shrub layer; tree layer productivity accounted for the absolute proportion of the total above ground productive forces.