ESTIMATE OF THE DENSITY OF Eucalyptus grandis W. Hill ex Maiden USING NEAR INFRARED SPECTROSCOPY

Silviana  Rosso; Graciela Ines  Bolzon de Muniz; Jorge Luis  Monteiro de Matos; Clóvis Roberto  Haselein; Paulo Ricardo  Gherardi Hein; Merielen  de Carvalho Lopes

ESTIMATE OF THE DENSITY OF Eucalyptus grandis W. Hill ex Maiden USING NEAR INFRARED SPECTROSCOPY

Autores

Silviana Rosso

Graciela Ines Bolzon de Muniz

Jorge Luis Monteiro de Matos

Clóvis Roberto Haselein

Paulo Ricardo Gherardi Hein

Merielen de Carvalho Lopes

Editor

Universidade Federal de Lavras

Descripción

This study aimed to analyze use of near infrared spectroscopy (NIRS) to estimate wood density of Eucalyptus grandis . For that, 66 27-year-old trees were logged and central planks were removed from each log. Test pieces 2.5 x 2.5 x 5.0 cm in size were removed from the base of each plank, in the pith-bark direction, and subjected to determination of bulk and basic density at 12% moisture (dry basis), followed by spectral readings in the radial, tangential and transverse directions using a Bruker Tensor 37 infrared spectrophotometer. The calibration to estimate wood density was developed based on the matrix of spectra obtained from the radial face, containing 216 samples. The partial least squares regression to estimate bulk wood density of Eucalyptus grandis provided a coefficient of determination of validation of 0.74 and a ratio performance deviation of 2.29. Statistics relating to the predictive models had adequate magnitudes for estimating wood density from unknown samples, indicating that the above technique has potential for use in replacement of conventional testing.