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Open AccessArticle

Bark Features for Identifying Resonance Spruce Standing Timber

1
Departament of Forest Engineering, Forest Management Planning and Terrestrial Measurements, Transilvania University of Brașov, 500123 Brașov, Romania
2
Gurghiu Forestry High School, 547295 Gurghiu, Romania
3
Department of Mechanical Engineering, Transilvania University of Brașov, 500036 Brașov, Romania
*
Author to whom correspondence should be addressed.
Forests 2019, 10(9), 799; https://doi.org/10.3390/f10090799
Received: 15 August 2019 / Revised: 1 September 2019 / Accepted: 6 September 2019 / Published: 12 September 2019
(This article belongs to the Special Issue Genetic and Phenotypic Variation in Tree Crops Biodiversity)
Measuring the acoustic properties of wood is not feasible for most luthiers, so identifying simple, valid criteria for diagnosis remains an exciting challenge when selecting materials for manufacturing musical instruments. This article aims to verify whether the bark qualities as a marker of resonance wood are indeed useful. The morphometric and colour traits (in CIELab space) of the bark scales were compared with the structural (width and regularity of the growth rings and of the latewood) and acoustic features (transverse sound velocity, radiation ratio, impedance, and wood basic density) of the wood from 145 standing and 10 felled spruce trees, which are considered a resource of the resonance wood in the Romanian Carpathians. It has been emphasized that the spruce trees with acoustic and structural features that match the requirements for the manufacture of violins have a bark phenotype distinguishable by colour (higher redness, lower yellowness and brightness)—as well as by scale shape (higher slenderness and width). The south-facing side of the trunk and the external side of the scale are best for identifying resonance trees by their bark. Additionally, the mature bark phenotypes denote topoclinal variations and do not depend on tree age. Moreover, the differences among bark phenotypes are noticeable to the naked eye. View Full-Text
Keywords: bark phenotype; bark scale; Norway spruce; resonance wood; sonic tomography bark phenotype; bark scale; Norway spruce; resonance wood; sonic tomography
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MDPI and ACS Style

Dinulică, F.; Albu, C.-T.; Vasilescu, M.M.; Stanciu, M.D. Bark Features for Identifying Resonance Spruce Standing Timber. Forests 2019, 10, 799.

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