CORRELATIONS BETWEEN NEAR-INFRARED SPECTRA OF WET-STORED TIMBER AND THE STORAGE TIME IN RELATION TO THE WATER-QUALITY

Near-infrared spectroscopy (NIR) and multivariate calibration using partial least squares regression (PLSR). Were used to study the correlation between the storage time of wet-stored timber and NIR spectra of the wood. as well as to distinguish between different wood zones (sapwood and heartwood). The wood zones were well distinguishable by NIR in logs of Scots pine (Pinus sylvestris). When wet-stored using recirculating water, between 70 and 92% of the variance was explained, whereas after wet-storage using tap water, less than 50% of the variance in the storage time was explained.