Abstract

Caesalpinia echinata Lam. (pernambuco or pau-brasil), is recognised as the premier raw material for manufacturing bows for stringed instruments. Owing to limited wood supplies and concerns regarding species survival, interest exists in establishing pernambuco plantations to provide bow quality wood in the future. Rapid methods for estimating wood quality are also required and we examined the estimation of density, modulus of elasticity (MOE), and modulus of rupture (MOR) using near infrared (NIR) spectra collected from the transverse surface of blocks cut from the end of 73 pernambuco clear wood samples. The samples represented three populations: plantation grown pernambuco 25 years old (19 samples) and 30 years old (26 samples) and native forest pernambuco (28 samples). NIR spectra were collected using two spectrometers: a Foss NIRSystems 5000 and an Analytical Spectral Devices, Inc., AgriSpec (ASD) spectrometer fitted with a fibre-optic probe. For individual populations, density had the strongest statistics followed by MOE and MOR, with the native forest woods providing the best calibrations. The limited variation of the plantation woods explained their weaker statistics. Calibrations based on the three populations combined provided strong R²_c for density (0.89 Foss spectra, 0.85 ASD spectral and moderate R²_c for MOE (0.77 Foss spectra, 0.72 ASD spectra), while MOR calibrations were weak. The success of calibrations based on ASD spectra suggests that NIR assessment of pernambuco wood properties in the field may be possible.

© 2011 IM Publications LLP

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