CURRENT PRESERVATION, GROWTH INTENSITY AND SANITARY THE CONDITION OF THE TREES OF THE COMMON PINE IN NEED GEOGRAPHICAL FOREST CULTURES OF THE VORONEZH REGION
The tension of growth, safety and sanitary condition of trees in maturing geographical cultures of Scots pine are analyzed. Initially overburdened forest cultures were formed during life under the influence of external environmental factors, as well as under the influence of internal processes of tree competition and intraspecific variability. Only dead trees were periodically removed from the stands. All this predetermined the current state and safety of the trees. At the age of 60, trees of forest-steppe and steppe ecotypes are characterized by different preservation and growth rates. In forest-steppe ecotypes, their current preservation is higher (7.01%), and in steppe ecotypes it is lower (4.75%). In the former, the average score for the sanitary condition is 1.58 (the score is healthy) with fluctuations from 1.2 to 1.8, for the second - 1.71 (the score is weakened) with the variation from 1.2 to 2.6. The average index of the tension of tree growth (PNR) according to H.: Dav in stands of forest-steppe ecotypes is 0.981, and according to H.: Gav - 5.043. In steppe ecotypes, the NDP is 0.836 and 4.971, respectively. The variability of the radial growth of tree trunks at a height of 1.3 m indicates the termination of the period of accelerated growth in forest-steppe ecotypes at 15 years old and the onset of its stabilization period from 25 years of age, and in steppe ecotypes - at 10 years and from 30 years of age