Simplified formulas for determining the volumes of the trunks of birch

The article is devoted to the consideration of questions the construction of simplified formulas to calculation the volumes of the trunks of growing trees silver birch of the Krasnoyarsk-Achinsk-Kansk forest-steppe region. The study based on the materials of six sample plots, with the felling and measuring of 147 model trees. At the first stage of the work, was the analysis of the main volume-forming characteristics of the trunks. They included species height, species diameter and species cross-sectional area. It turned out that the species cross-sectional area is of considerable interest for practical usage. Then the equation of relationship between the diameter of trunk at breast height and species cross-sectional area was obtained, also between them high correlation dependence was established. An attempt to simplify the obtained formula to determine the volume of the trunk was not successful, because even a slight rounding of the constant coefficients of the equation entails significant changes in the value of the species cross-sectional area...