Abstract
The article promotes to use tree social classes method for the selections of model trees while evaluate biomass in mature natural forest stands because of tree size variability. Average aboveground biomass of Norway spruce model trees calculated to be 542 ± 42 kg, which accumulate every year 6,1 ± 0,4 kg of dry matter and sequester 2,9 ± 0,2 kg of carbon from the atmosphere. We found a significant effect (α = 0,05) of a tree canopy position on a volume of accumulated biomass. Key words: natural stands, mature phase, Cheremosh watershed, Norway spruce, social class, tree size variability, aboveground biomass, mean annual increments, aboveground biomass components, sequestered carbon.
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