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Intra-Ring Variations and Interrelationships for Selected Wood Anatomical and Physical Properties of Thuja Occidentalis L.

Institut de Recherche sur les forêts, Université du Québec en Abitibi-Témiscamingue; Rouyn-Noranda, Québec, QC J9X 5E4, Canada
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This manuscript is part of the Ph.D. thesis of the first author available Online at depositium.uqat.ca.
Forests 2019, 10(4), 339; https://doi.org/10.3390/f10040339
Received: 3 March 2019 / Revised: 11 April 2019 / Accepted: 15 April 2019 / Published: 16 April 2019
(This article belongs to the Special Issue Tree Crown Dynamics and Morphology)
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Abstract

Intra-ring variation in wood density and tracheid anatomical properties and wood property interrelationships were investigated in Thuja occidentalis L. Samples were taken from three stands in Abitibi–Témiscamingue, Quebec, Canada. The structure of T. occidentalis wood is simple, homogeneous and uniform, which is desirable for wooden structures that require wood uniformity. From early- to latewood, cell and lumen diameter decreased, while cell wall thickness increased. These changes led to an increase of the cell wall proportion. Wood ring density and width interrelationships were weaker in mature wood compared to juvenile wood. Earlywood density is the more important in determining mature wood density than latewood density and proportion. Earlywood density explains 92% and 89% of the variation in juvenile and mature wood density, respectively. The negative relationship between ring density and width, although significant, was low and tends to weaken with increasing tree age, thus providing the opportunity for silvicultural practices to improve both growth and wood density. Ring width was positively and strongly correlated to early- and latewood width, but negatively correlated to tracheid length and latewood proportion. Accordingly, increases in ring width produce smaller tracheids and wider earlywood without a corresponding increase in latewood. Practical implications of the results are discussed. View Full-Text
Keywords: wood properties; ring density; anatomical properties; intra-ring variation; wood properties interrelationships wood properties; ring density; anatomical properties; intra-ring variation; wood properties interrelationships
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Bouslimi, B.; Koubaa, A.; Bergeron, Y. Intra-Ring Variations and Interrelationships for Selected Wood Anatomical and Physical Properties of Thuja Occidentalis L.. Forests 2019, 10, 339.

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