Evaluating the Precision of Growing Stock Estimation and Determination of Industrial and Fuel Wood Volumes of Beech Trees in Northern of Iran

The precision of growing stock were assessed. Industrial & fuel wood volumes of beech trees in Shanderman District was surveyed. For this purpose, 10% of the annual marked trees for loggings were randomly selected in five parcel from this District. After measuring the diameter at breast height (DBH) to estimate the volume of trees by Tariff table, the trees were cut; the volumes of the industrial woods of trees were computed by using Huber's formula. The volume of fuel woods with diameter above 12 cm also were calculated by Huber's method and the diameter below 12 cm were estimated as ester. The results indicated that there were significant differences between estimation of total tree volumes by Tariff table and the total volumes of cut trees at 0.01 confidence levels. The suitable model for relationship between DBH and total volumes was a parabolic model. Industrial and fuel wood volumes of beech trees were 68.9% and 31.1% in the study area, respectively (at 95% confidential). The mean industrial volume of beech trees to total volume was between 61.1%&76.7% and fuel wood volume was between 26.49%&35.71%.