Tree Biomass Carbon Of Evergreen Broad-Leaved Forest In The Middle Subtropics Of China

Biomass carbon of tree layer in the three successional stages of Pinus massoniana forest (PMF), Pinus massonianaand broad-leaved mixed forest (PBF) and evergreen broad-leaved forest (EBF) was studied. The results showed that the biomass carbon storage of tree layer was the highest in EBF (129.34 t/hm(2), followed by PBF and PMF with 95.83 and 85.27 t/hm(2), respectively. Biomass carbon of various tree components showed the trend as stem> root> branch > leaf >bark. With the succession, the proportion of the stem accounted for the tree biomass carbon reduced, and the root of the proportion had increased. Tree biomass carbon is mainly concentrated in the 20-30cm diameter at breast height (DBH), or more than 30cm DBH.