Coefficients of variation for age stages and parameters: SLA – specific leaf area (cm2 g-1), TB – total biomass [g], rmf – root mass fraction, lmf – leaf mass fraction, smf – stem mass fraction, PLA – projected leaf area [cm2], LAR – leaf area ratio [cm2 g-1]. The same letters species which did not differ statistically significantly (p>0.05) in pairwise comparisons by modified signed-likelihood ratio (M-SLR) tests of differences. Tests revealed the same division into species groups for both saplings and seedlings.