Two-parameters single equation stem taper models of Pinus sibirica in Siberia, Russia

A large number of studies have been devoted to the cedar forests in Russia, but conicity trunks remain limited. The main goal this study was analyze two-parameter single equation stem tapper models for Siberian trees, which will serve as guidelines future research. tested six one trunk trees. For this, data from 1805 measurements diameters 193 felled trees were used. collected natural pure and mixed pine stands Irkutsk region (Southern Siberia) Tyumen (Western Siberia), Russia. Our analysis showed that our set, Reed Green model turned out be best model. is characterized by smallest average absolute error percentage, square root mean error, largest coefficient determination. residuals are independent constant variance. performed a good fit central part trunk, therefore, forestry management should used with caution. purposes forests, it recommended develop put into practice more complex models.