More pieces had been rejected in producing the lumber. These pieces could be utilized as the biomass energy. The use of wood incorporating utilization of these pieces as the biomass energy let achieve the resources recycling in the forest. Following results were obtained. : 1) The amount of the logs for the lumber production should be increased more than fiscal year 2004 by six times. 2) The amount of the rejected pieces corresponded 45% of the produced lumber. 3) The reduction of CO_2 emission by utilizing the wooden biomass energy was 0.59t-CO_2/(lm^3 lumber-year).
