5th INTERNATIONAL CONGRESS ON KHAZAR SCIENTIFIC RESEARCH AND INNOVATION
STEM VOLUME EQUATIONS FOR ORIENTAL BEECH STANDS IN ALMUS FOREST ENTERPRISE
This study aims to develop stem volume equations for Oriental beech (Fagus orientalis Lipsky) stands distributed in Almus Forest Enterprise, Tokat. For this purpose, a total of 90 trees were destructively sampled from Oriental beech stands with different stand ages, crown closure and site classes in Alan, Tozanlı and Yeşilırmak Planning Units. The diameter at breast height, total height and stem diameters at 2 m intervals starting from the stump height to top of sample trees were measured. Using the measured stem diameters, the stem volume of each sample tree was calculated by the sectional method. Five single-entry stem volume equations including only the diameter at breast height as an independent variable and ten double-entry stem volume equations including the diameter at breast height and tree height as independent variables were fitted by the Least Squares Method. The fitted volume equations were compared with the relative ranking approach in terms of coefficient of determination (R2), root mean square error (RMSE), mean absolute error (MAE) and Akaike information criterion (AIC), and the most successful single- and double-entry stem volume equations were determined.
