BARK THICKNESS OF THE LOWER PART OF BIRCH (BETULA PENDULA) TREES UNDER THE CONDITIONS OF MIDDLE SIBERIA
The thickness of model birch (<i>Betula pendula</i>) trees bark has been studied. On the base of data obtained subsidiary tables for determining absolute and relative values of the bark double thickness in the lower part of tree stems by the diameter and age of trees under the conditions of Middle Siberia have been drawn up.