Acta Scientiarum Polonorum
Silvarum Colendarum Ratio et Industria Lignaria

Abstract The presented paper discusses the results of investigations on the biomass of a stand which developed on the fresh mixed coniferous forest site. The precise knowledge of data concerning the weight of individual tree elements can provide information allowing researchers to carry out other experiments associated with, for example, the determination of the biomass as the raw material base, the assessment of nutrients withdrawn from the forest with the harvested raw material as well as other types of information. The performed investigations revealed that, in the case of the examined site, the total over ground weight of pine trees amounted to 264 500 kg/ha of which the greatest proportion fell on the bole timber (approximately 212 t/ha), whereas the smallest share – on thicker branches (of the diameter over 4 cm). The performed moisture content experiments allowed the authors to determine the dry weight of individual parts of trees. The percentage proportion of individual parts was similar to the weight structure of the fresh parts. The highest difference was determined in the case of bark – its dry weight was by 2 percent higher in comparison with the fresh weight.