This study aimed to estimate the content and exportation of micronutrients (Mn, B, Cu, Zn e Fe) and Na in different tree components of black wattle (Acacia mearnsii De Wild.) forest of Batemans Bay Australian provenance, 2.4 years old in Butiá, RS, Brazil. The total biomass found was 36,155 kg/ha, thus distributed: 46.0%; 20.0%; 19.5%; 12.0% and 3.0%, spread in the wood of the stem, leaves, live branches, bark and dead branches, respectively. The proportion of the micronutrients accumulated in the biomass of the components were: leaves (43.76%), wood of the stem (26.94%), live branches (19.56%), bark (7.21%) and dead branches (2.54%). The estimated micronutrient values in the above-ground biomass were 10.4 kg/ha, accumulated in Na (58.84%), Fe (21.79%), Zn (9.16%), Mn (4.59%), B (4.09%) and Cu (1.54%). The bark and wood accumulated Na values were (21.47%), Fe (6.71%), Mn (2.11%), Zn (1.66%), B (1.58%) and Cu (0.63%). The crown (leaves, live and dead branches) accumulated : Na (37.36%), Fe (15.07%), Zn (7.49%), B (2.53%), Mn (2.48%) and Cu (0.91%). The intensive exploration areas of Batemans Bay provenance, signal possible ocurrence of nutritional deficiencies in future rotations, making it necessary to use fertilizer to mantain productivity.
Micronutrients; exportation of micronutrients; Acacia mearnsii
