Biomass and nutrients in Eucalyptus urograndis stands in southeastern Mountain Range-RS

Abstract

This study had as objective to quantify biomass and nutrients, in an 18 months Eucalyptus urograndis stand in southeastern mountain range, Piratini-RS. Twenty-four (24) plots (15.0 m x 22.5 m) were allocated; after that, one tree (with diameter at breast height) was felled in each plot. The tree was fractionated in the following fractions of above ground biomass: wood, bark, branches and leaves. Total biomass was 18.5 Mg ha-1, being the wood the fraction with highest biomass (37%), followed by branches (34.2%), leaves (21.3%) and bark (7.6%). Leaves showed highest nutrients concentrations, being statistically superior to other fractions (p<0.05), excepted for Ca, Mg and B. For macronutrients, the accumulation magnitude was Ca > N > K > Mg > P > S, and for micronutrients was Mn > Fe > B > Zn > Cu. Highest amount of nutrients is contained on leaves component, due to the highest nutrients concentration, excepted for Ca, Mg and Cu that are located in large quantities in the branches.