Journal of Wood Science

, Volume 61, Issue 3, pp 251–261 | Cite as

Near-infrared spectroscopy as a potential method for identification of anatomically similar Japanese diploxylons

  • Yoshiki Horikawa
  • Suyako Mizuno-Tazuru
  • Junji Sugiyama
Original article

Abstract

A reliable technique for distinguishing anatomically similar diploxylons, Pinus densiflora and P. thunbergii, was designed by employing near-infrared (NIR) spectroscopy in combination with multivariate analysis. In total, 24 wood blocks, with half of them being of P. densiflora and the rest of P. thunbergii, were selected from the collections of the Kyoto University xylarium and scrutinized to build an acceptable model for discriminating between the two species. The prediction model was constructed only from heartwood, and the best performance was obtained for wavenumbers of 7,300–4,000 cm−1 in the second derivative spectra. To apply this model to actual materials obtained from historical wooden buildings, 12 aging wood samples were analyzed and compared by microscopic identification. Unexpectedly, the spectral differences between the species were smaller than those caused by aging, and the prediction error was approximately 50 %. The spectra of the aging samples were quite distinct in the specific region characteristic of absorbed water (5,220 cm−1); this was demonstrated clearly by principal component analysis. Therefore, for the proposed model to be suitable for use in practical applications, further investigations of aging wood samples and the corresponding spectroscopic data are necessary to understand the effects of aging on the spectral data.

Keywords

Discriminant analysis NIR spectroscopy Japanese diploxylons Wood identification Aging wood 

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Copyright information

© The Japan Wood Research Society 2015

Authors and Affiliations

  • Yoshiki Horikawa
    • 1
  • Suyako Mizuno-Tazuru
    • 1
  • Junji Sugiyama
    • 1
  1. 1.Research Institute for Sustainable HumanosphereKyoto UniversityUjiJapan

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