GROWTH AND VOLUMETRIC PRODUCTION OF EUCALYPTUS CLONES IN DIFFERENT PLANTING SPACES

Wesley Gomes Silva,Filipi Duran Mattos,Rita De Cássia Mariano De Paula,Ana Paula Leite Lima,Sebastião Ferreira Lima,Darcy Maria Da Conceição Laura Dos Santos Santos

doi:10.32404/rean.v6i3.3386

Wesley Gomes Silva, Filipi Duran Mattos + Show 4 more

Open Access

https://doi.org/10.32404/rean.v6i3.3386

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Abstract

In forest stands, the ideal planting spacing can provide each tree with enough space for its establishment, aiming at greater growth and wood quality, according to the objective of planting. The objective of this study was to evaluate the growth in height, diameter, and volumetric production of three eucalyptus clones planted in different spacings. The experiment was carried out in an area belonging to Campo Bom Farm, in Chapadão do Sul, MS. A randomized block design was used in a factorial scheme, combining six spacings (2.5 x 0.5 m; 2.5 x 1.0 m; 2.5 x 2.0 m; 3.0 x 0.5 m; 3.0 x 1.0 m and 3.0 x 2.0 m) and three clone of Eucalyptus grandis x Eucalyptus urophylla (GG 680, GG 157 and GG 100) with three replications. The diameter at breast height (DBH) and height of all plants were evaluated at 12, 18, 24, and 32 months after planting. At 32 months, the cubage of a tree per plot was performed to obtain the volume of wood per tree and hectare. In the largest spacings, the highest average plant heights were observed. The growth of plant height was reduced from 24 months of age, except for the GG 680 clone, at 2.5 x 2.0 m and 2.5 x 1.0 m spacings, and in GG 100 clone, at 2.5 x 1.0 m spacing. The average diameter and volume per tree increased with the spacing for the three clones, while the volume per area was higher in the denser spacing. Wood volume production per area was dependent on the spacing used for the three clones.

Highlights

The world's energy matrix is based on the use of fossil fuels, being expensive, insecure, and harmful to the environment
Height growth The plant height of eucalyptus was significantly influenced by the interaction between the studied clone, the planting spacing, and the evaluation time
For the three clones studied, it can be observed that the growth in height as a function of planting spacing began to show a difference by around 18 months of planting (Figure 1)

Summary

Introduction

The world's energy matrix is based on the use of fossil fuels, being expensive, insecure, and harmful to the environment. According to Protásio et al (2014), the use of biomass for energy generation has the advantage of being renewable, less polluting and reducing the emission of carbon dioxide into the atmosphere when compared to fossil fuels. With the demand for forest biomass for energy generation, the concept of energy forests emerges which, from the sharp reduction in plant spacing, aims to produce more biomass per unit area, using shorter rotations (Harrington et al, 2009) than those adopted in conventional forest plantations. The volume and biomass production per unit area is expected to be higher due to the greater use of growth resources, but along the crop rotation it is expected that this effect will be minimized (Leite et al, 1997)

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