Parâmetros de crescimento de Eucalyptus dunnii Maiden sob diferentes espaçamentos

Abstract

We investigated the effects of planting spacing on the growth of Eucalyptus dunnii in order to compare diameter, height and volume. To do so, it is necessary to compare the data obtained in the years 2009 and 2019. The implementation of the experiment occurred in August 2008, with the planting of Eucalyptus dunnii Maiden seedlings under different spacings. The statistical design was a randomized block design, with three replications and four treatments. The treatments were defined by the initial spacing of: 1.5 x 1.5 m (2.25 m2); 2 x 2 m (4.00 m2); 2 x 3 m (6.00 m2); and 3 x 3 m (9.00 m2). On May 13, 2019, measurements were made of breast height diameter (DBH) and total height of the trees. Dead, broken and borderless trees were discarded from the evaluations. To estimate the total height, a dendrometric drawing board was used and the estimates of the individual volume and volume per hectare of wood were subsequently made. Therefore, for the variable DAP in 2009, there was no difference between them. However, the data for 2019, show that the larger spacings obtained the highest DAP averages. Total height did not show significant differences between treatments in both evaluation years. The volume of wood by area in 2009 was higher in the denser spaces, while for the 2019 data, the 2 x 2 m (4 m2) treatment presented the highest volume estimate per hectare. This indicates a positive response of the diameter spacing to the breast height (DBH) and volume of wood, but the height variable did not show a correlation.