Non-destructive prediction of decay resistance of<i>pinus sylvestris</i>heartwood by near infrared spectroscopy

Abstract

Restrictions on the use of wood preservatives have increased interest in the utilization of the natural durability of wood. In Scandinavia Scots pine (Pinus sylvestris L.) is an important commercial tree species. Its heartwood has traditionally been used in constructions exposed to risk of decay. In a laboratory experiment Scots pine wood specimens sampled from inner heartwood, outer heartwood and sapwood were exposed to the brown rot fungus Poria placenta. Outer heartwood was found to be more resistant than inner heartwood and sapwood. Near infrared spectroscopy (NIR) spectra obtained on solid wood before decay testing were used in multivariate calibrations to predict decay resistance of heartwood. Results from multiple test set validated partial least squares regression models showed that resistance to decay in Scots pine heartwood could be predicted with satisfying precision using NIR spectroscopy. As NIR spectra were collected on solid wood, development of the method for industrial use is potentially possible.