Journal
FOREST SCIENCE
Volume 65, Issue 5, Pages 548-555Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/forsci/fxz007
Keywords
basic wood density; moisture content; near-infrared spectroscopy; poplar wood
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Funding
- National Key Research and Development Program of China: High Efficiency Clean Pulping and Functional Product Production Technology Research [2017YFD0601005]
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The potential of near-infrared (NIR) spectroscopy coupled with partial least-squares (PLS) regression was used to determine the moisture content and basic density of poplar wood chips. NIR spectra collected from the surface of wood chips were used to develop calibration models for moisture content and basic density predication, and various spectral preprocessing techniques were applied to improve the accuracy and robustness of the prediction models. The models were tested using totally independent sample sets and exhibited acceptable predictive performance for moisture content (coefficient of determination for prediction [R-p(2)] = 0.98 and standard error of prediction [SEP] = 2.51 percent) and basic density (R-p(2) = 0.87 and SEP = 17.61 kg m(-3)). In addition, the effect of moisture variations on prediction of basic density was investigated based on NIR spectra from wood chips under various moisture levels. The results demonstrated that broad absorption bands from water molecules, especially when free water exists in the cell lumen, overlap with informative signals related to wood properties and weaken the calibration relation between spectral features and basic density. Thus, maintaining wood chips in a low and even moisture state would help achieve reliable estimates of wood density by NIR analysis models.
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