Timber Properties of Lesser-Known Toona ciliata M. J. Roemer from Agroforestry System in Moshi Rural District, Tanzania and Its Potential Substitution for Well-known Species
Résumé
This study investigated the physical and mechanical properties of Toona ciliata (Australian Red Cedar), a lesser-known timber species grown in agroforestry farms in Moshi Rural District, Kilimanjaro Region in Tanzania, with a focus on some of its physical and mechanical properties and potential substitution for well-known timber species in various applications. Whereas the physical properties were Wood Colour and Basic Density, the mechanical properties were Static Bending (Modulus of Elasticity/Bending strength, Modulus of Rupture/Stiffness and Work to Maximum Load), Compression parallel to grain, Shear parallel to grain and Cleavage. Three defect-free sample trees were used for assessment of the properties using standard operating procedures stipulated by the International Standards Organization (ISO). Descriptive statistics were used to summarize the properties, and regression analysis explored relationships between basic density and mechanical properties. Results indicated that T. ciliata has whitish sapwood and reddish heartwood with a mean Basic Density of 531 kg/m³, classifying it as medium-density timber. The key mechanical properties include Modulus of Elasticity (4,935 N/mm²), Modulus of Rupture (49 N/mm²), Compression parallel to the grain (30.8 N/mm²), Shear (11.2 N/mm2) and Cleavage (18.4 N/mm - width). Density revealed strong positive correlations with Modulus of Elasticity, Modulus of Rupture and Compression strength. A one-way analysis of variance (ANOVA) showed no significant radial variation in Basic Density. Comparative analysis with Khaya anthotheca (East African mahogany) and Uapaca kirkiana (sugar plum) highlighted similarities, suggesting that T. ciliata could substitute these species in applications requiring toughness, bending strength, and stiffness. The study concluded that T. ciliata is a viable alternative in timber markets, particularly where medium-density wood is required
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