Intensywność przyrostu miąższości świerka z Beskidów Zachodnich

The research material including the results of a full analysis of 171 spruce stems, selected from among 57 stands growing at altitudes of 600−1,200 m a.s.l. indicated a significant impact of the position of a stand above sea level on volume growth rate and age of its culmination. Of the three properties dbh, height and basal area growth explain the greatest range of variability of growth rate (from 75% to 91.1%). Equations developed on the basis of the above mentioned properties allow determining the values for growth rates with the mean error of 7.17−13.97%.