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Prediction of Wood Density Using near Infrared-Based Partial Least Squares Regression Models Calibrated with X-Ray Microdensity

Material and methods A 2-mm thick strip from pith to bark from a 25-year-old Japanese larch (Larix kaempferi) wood sample was prepared and dried to an equilibrium moisture content of approximately 12% and stored at 20°C at a relative humidity of 60% prior to analysis. X-ray microdensity was determined using the multi soft X-ray film shooting apparatus CMB (Softex Co., Ltd) while the Micro densitometer Type-2111 (Konicamedical Co.) measured sample microdensity at 100 µm resolution. NIR diffuse reflectance spectra were collected over the wavenumber range from 12,500 cm –1 to 4000 cm –1 with a resolution