Age features of variability of trunk diameters in pure pine stands

In article results of the diameters variation analysis of trunks in pine forest stands depending on age and from average diameter of planting are resulted. The increase of a trees diameters variation expressed in absolute units and reduction of variability of diameters expressed in relative units is noted. The comparative analysis of trees distributions on natural (relative) diameter classes in pine forests of Belarus is carried out. It is shown that the distribution rows received for 3–6 age classes, have no authentic differences among themselves, but authentically differ from the distribution rows received for pine forests of 1 and 2 age classes. Trees distribution rows on natural diameter classes for pine young stands (1–2 class of age), and also for forest stands of 3–6 classes of age are received