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Utilization of genetic algorithms to optimize loblolly pine wood property models based on NIR spectra and SilviScan data

Abstract

Near-infrared wavelengths selected by genetic algorithm were used to optimize partial least squares (PLS) regression models for loblolly pine (Pinus taeda L.) from the southeastern United States. Wood properties examined included density (D), microfibril angle, modulus of elasticity and tracheid coarseness (C), radial diameter (R), tangential diameter (T), and wall thickness (w)—measured by SilviScan. The optimization process was run for each property with Agenda 2020 samples utilized for PLS model development and the other sets used for prediction. The number of variables (i.e. wavelengths) varied from 10 to 100 with an optimum number identified by genetic algorithm. When compared to a full data set model (based on 700 wavelengths), calibration and prediction performance of optimized PLS regression models were superior for all properties. Importantly, representative wavelengths for each property were consistently related to recognized bond vibrations observed in specific wood components demonstrating that optimization targets wavelengths directly related to changes in wood chemistry within the examined loblolly pine samples.

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Ho, T.X., Schimleck, L.R., Dahlen, J. et al. Utilization of genetic algorithms to optimize loblolly pine wood property models based on NIR spectra and SilviScan data. Wood Sci Technol 56, 1419–1437 (2022). https://doi.org/10.1007/s00226-022-01403-z

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