This study aimed to estimate the amount of biomass and the length of fine roots (< 2mm of diameter) in different soil depths for the 10 -year-old species Eucalyptus urophylla S.T. Blake. The experiment was conducted Santa Maria, RS on the Campus of the Federal University of Santa Maria. The plots were 27 m long and 14 m wide and 3 m x 2 spaced. Four monoliths of 25 cm x 25 cm x 60 cm were sampled and divided into six geometric sections at depths of 0-10, 10-20, 20-30, 30-40, 40-50, 50-60 cm. Roots were separated from the soil by using a set of two sieves (2 mm and 1 mm) and water jets. The intersection method was used to determine root length producing photos with the use of a scanner. The results showed a high concentration of fine roots in the first 20 cm of the soil. Fine root total biomass found for Eucalyptus urophylla was 1.451,6 kg/ha, 57.9% were concentrated in the first 20 cm of soil. The total length of fine roots was 27.968,9 km/ha, with 64.3% being in the first 20 cm of depth.
Fine roots; Eucalyptus urophylla and forest nutrition
