Influência do espaçamento em primeira e segunda rotação de eucalipto manejado sob regime de curta rotação

This study aimed to evaluate the dendrometric characteristics and wood properties of a two-rotation of the 1277 eucalypt clone (E. grandis x E. camaldulensis) in Jatai-GO, Brazil, with short rotation system. The experiment followed a randomized block design, with six planting density (3.0 x 0.5 m, 3.0 x 1.0 m; 3.0 x 1.5 m; 3.0 x 2.0 m; 3.0 x 2.5 m 3.0 x 3.0 m) and three replicates. At each rotation, diameter at 1.30m above ground level (DBH), total height (HT), total volume (VT), basic density (DB), higher calorific value (PCS) and carbon (C), hydrogen (H) and oxygen (O) contents in wood, were evaluated. The data obtained were analyzed using variance analysis and for significant effects the Scott-Knott (a = 5%) test was performed. The paired t-test (a = 5%) was used for comparison between the first and second rotation, evaluating the characteristics at each spacing. In the first rotation, the spacing affect significantly the DBH and VT, while in the second rotation, the DBH, VT, and C, O and H contents were influenced by the spacing. In both rotations, the DBH showed the largest values in greater spacing while the VT showed the largest values in smaller spacings. Comparing the two rotations, it was verified that for most of the evaluated characteristics, there was a significant difference in all spacing, with decreases in all dendrometric variables and C and H contents and increase in DB, PCS and O content.