1-2 造材歩留まりを考慮した木質資源利用可能量の検討

抄録

It is important to grasp the yield percentage in order to estimate the available amount of woody biomass resources. Previously it was estimated using a fixed yield percentage. However, it is pointed out that the yield percentage depends on tree species and forest age. Therefore, the yield of tree species was estimated from the log production data and the available amount of woody biomass resources was estimated. We compiled the production of logs and pulp from log production data of national forest and private forest. The yield percentage was estimated by dividing the result by the amount of logging. As a result, the yield percentage by tree type was 67% larch, 68% cypress, 58% cedar, 48% red pine. It is compared with estimation of woody biomass resources with fixed yield of 80%. Considering the yield percentage, the available amount of any tree species decreased.