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iForest - Biogeosciences and Forestry

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Estimation of total extractive content of wood from planted and native forests by near infrared spectroscopy

Luana Teixeira Mancini, Fernanda Maria Guedes Ramalho, Paulo Fernando Trugilho, Paulo Ricardo Gherardi Hein   

iForest - Biogeosciences and Forestry, Volume 14, Issue 1, Pages 18-25 (2021)
doi: https://doi.org/10.3832/ifor3472-013
Published: Jan 09, 2021 - Copyright © 2021 SISEF

Research Articles


The aim of this study was to evaluate the performance of multivariate models using Near infrared (NIR) spectra for predicting total extractives content of solid and powdered wood of planted and native species from tropical savanna. NIR spectra were recorded on the milled wood and radial surface of solid wood specimens of Cedrela sp., Jacaranda sp., Apuleia sp., Aspidosperma sp. and clones of Eucalyptus hybrids via an integrating sphere and fiber optics probe. NIR spectral signatures were evaluated by Principal Component Analysis (PCA) and then associated to the total extractive content quantified by extraction in toluene/ethanol (2:1) solutions, pure ethanol and hot water by Partial Least Squares (PLS) regressions. PCA revealed that NIR spectra measured in solid wood by integrating sphere gave a better discrimination of wood species. A global PLS model was developed based on NIR obtained by integrating sphere with satisfactory estimations both for solid wood (R²cv= 0.87, RMSECV= 1.08%) and wood powder (R²cv= 0.85, RMSECV= 1.19%). An independent test-set validation was performed with 25% of the samples and yielded R²p= 0.93 and RMSEP= 0.95% (for solid wood) and R²p= 0.87 and RMSEP= 1.40% (for wood powder). Both models can be applied for rapid screenings, though models developed from NIR spectra by integrating sphere on solid wood are considered more suitable for rapid predictions of extractive content in unknown wood specimens.

  Keywords


Lumber, Multivariate Analysis, Non-destructive Testing, Test Set Validation, Wood Chemistry

Authors’ address

(1)

Corresponding author

 
Paulo Ricardo Gherardi Hein
fernandaguedesrm@hotmail.com

Citation

Teixeira Mancini L, Guedes Ramalho FM, Trugilho PF, Gherardi Hein PR (2021). Estimation of total extractive content of wood from planted and native forests by near infrared spectroscopy. iForest 14: 18-25. - doi: 10.3832/ifor3472-013

Academic Editor

Giacomo Goli

Paper history

Received: Apr 15, 2020
Accepted: Nov 06, 2020

First online: Jan 09, 2021
Publication Date: Feb 28, 2021
Publication Time: 2.13 months

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