Modeling and Biomass Quantification in Eucalyptus saligna Smith Stand at the End Rotation in the South of Brazil

Abstract

The quantification of wood stock and other components of biomass is fundamental for forest planning. Given the difficulty of obtaining these data, the present study aims at the formulation of equations and the estimation of the different components of biomass, volume with and without bark, form factor and height of the trees at the end rotation. The study was carried out in the municipality of São Gabriel state of Rio Grande do Sul, Brazil with Eucalyptus saligna 10-year-old. The experimental design of the inventory and biomass quantification were completely randomized. In the inventory the DBH of all individuals of the 5 plots were measured. After determination of 4 classes of diameter were felled 12 trees and quantified leaves, branches, bark and wood. The selection of the models obtained coefficients of determination higher than 97%. The total biomass was 269 Mg ha-1, of which 89% was wood. The total volume was 546 and 494 m³ ha-1 with and without bark, representing an average annual increase of 54,6 and 49,4 m³ ha-1 year-1. The mean form factor was 0,48. The modeling presented excellent adjustments and certainly serves for future estimates of the stock biomass.

Selection of Models for Above-Ground Biomass in a Eucalyptus urograndis Stand

“…While in the present study the lowest adjustment was for the bark component R² aj 0.74, Viera et al [23] show that the lowest adjustment occurred for the leaves 0.86. For Momolli et al [26] the adjustments were much higher than the other authors, being the smallest adjustment for height with R² aj of 0.97.…”

“…However, that the best adjustments were for the variables wood, total and height. Momolli et al [26] also observed greater variability of the residues for the branches, leaves and bark components.…”

“…According to Momolli et al [26], in the Eucalyptus saligna stands at 10 years of age, the volume of wood was 546 m³ ha -1 , representing an average annual increase of 55 m³ ha -1 . These findings reinforce the idea that the maturity of stand is determinant.…”

“…Developing modeling in a 10-year-old Eucalyptus saligna stand Momolli et al [26] found interaction between DBH and height for all models chosen. In Eucalyptus urophylla x E. globulus at 10 years old, Viera et al [23] also selected the DBH variable to estimate the bark component.…”

Biomass Production and Nutritional Characterization of Eucalyptus benthamii in the Pampa Biome, Brazil

“…The modeling of above-ground biomass in a 10 years old clone of Eucalyptus saligna stand was performed by Momolli et al [20]. The authors found 89; 5.9; 3.2 and 1.8% of the biomass in the wood, bark, branch and leaf respectively.…”