Estimating coarse roots biomass in young silver birch stands on post-agricultural lands in central Poland

Abstract

Study analyses coarse (d>2 mm of diameter) roots biomass dynamics in young succession stands of silver birch (Betula pendulaRoth.) growing on abandoned farmlandsin central Poland. Researchmaterial based on 181 sample trees, which were gathered in 20 pure silver birch stands in 5 locations. The age of the trees varied from 1 to 16 years. Coarse roots biomass of the investigated treesranged from0.7 to 4305.5 g/tree (422.6 g/tree on average)showing great variability (coefficient of variation equals 185%). A clear dependence of belowground biomass on the age and size of a tree was observed.Root-to-shootratio values vary from 0.1 to 1.0 with evidence of a tendency to decrease with increasing age, diameter at the breast height and height of analysed trees.An allometric equationwas elaborated forthe estimation of belowground biomass based on height or diameter at breast height of young silver birches. The suitability of this formula should be considered for the estimation of biomass accumulation and carbon sequestration by young successionalsilver birch stands growing on abandoned agricultural lands.