MIXED AND MONOSPECIFIC STANDS OF EUCALYPTUS AND BLACKWATTLE. II – Fine Root Biomass Density
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Universidade Federal de Lavras
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The aim of this study was to evaluate fine root biomass density (FRBD) inmixed and monospecific stands of Eucalyptus grandis x E. urophylla and Acacia mearnsii(black wattle) in Bagé-RS (Southern Brazil). An experimental trial was installed with threetreatments: 100% Eucalyptus (100E); 100% Acacia mearnsii (100A); 50% Eucalyptus +50% Acacia mearnsii (50E:50A). The trial was carried using a randomized block designwith three replicates. The fine root (≤ 2.0mm) biomass density was determined 8 and 18months after planting the trees. Soil samples were collected, with a cylindrical extractorauger (d = 7.0 cm), from four depths (0 - 5, 5 - 10, 10 - 20 and 20 - 30 cm) at eachsampling point. After 8 months, the FRBD distribution was the same in both species andin all soil layers, reaching the maximum projection at 125 cm from the tree trunk. After18 months, the root biomass density was higher in the monospecific black wattle standthan in the monospecific eucalyptus stand and the mixed stand. The fine root biomassdensity was highest in the 5 - 10 cm layer close to the trunk, for the planting row spacing,the planting line and the diagonals between two planting lines. Knowledge about fine rootgrowth and distribution in soil at initial stages of stand development may help in decisionmakingfor intensive forestry, thus ensuring more efficient use of soil resources.
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