Effects of tree competition on biomass and biomass models of Pinus koraiensis plantation.

Based on data of tree biomass for Korean pine (Pinus koraiensis) plantations, this study dealed with biomass allocation patterns and tree competition influences on biomass partitioning and biomass models of individual tree total and components (stem, root, branch and leaf) for Korean pine plantations. The results showed that: leaf biomass was highest in the middle and bottom layers of crown, while live branch biomass increased from top to bottom layer; diameter at breast height(DBH), tree height, crown ratio, stem, branch, leaf and root biomass all showed a significantly exponential correlation with tree competition intensity. DBH, tree height, crown ratio, stem, branch, leaf and root biomass all decreased with increasing competition intensity, and there was no significant relationship between competition intensity and root to shoot ratio. With increasing competition intensity, the percentage of stem biomass deceased, and the percentage of branch, leaf biomass increased. There was no significant relationship between competition intensity and the percentage of root biomass. In the paper, the total and different component biomass models were established. All models could be a good predict of the Korean pine biomass