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Comparative Radial and Axial Variation in the Physical Properties of Bagalunga (Melia azedarach L.) and Two Plantation-Grown Wood Species Marasigan, Oliver Segundo; Daguinod, Shereyl Aguirre; Melendez, Dundaele Kyle Bayer; Villareal, Jayric Fuentes
Jurnal Sylva Lestari Vol. 14 No. 1 (2026): January
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v14i1.1254

Abstract

The wood properties of the tree vary from radial to axial position. Limited local studies focusing on these attributes hinder the improvement of wood applications. This study examined the variation in the physical properties of bagalunga (Melia azedarach L.), teak (Tectona grandis L.f.) and mahogany (Swietenia macrophylla King.) across radial and axial positions. Physical properties were evaluated in accordance with the ASTM D143-2019 standard. Five trees per species were collected in Quezon Province, Philippines. Results showed significant variation in physical properties across species. Bagalunga (161.39%) displayed significantly higher green moisture content (GMC), 57.0% and 43.2% higher than mahogany (89.76%) and teak (104.10%), respectively. In terms of specific gravity (SG), bagalunga (0.42) had the lowest value, while teak (0.56) had the highest. Regarding shrinkage properties, bagalunga recorded the highest tangential and radial shrinkage, which were 49.2% and 48.9% higher than those of teak, and 77.6% and 18.4% higher than those of mahogany, respectively. Along the axial position, volumetric shrinkage (VS) declined from the butt to the middle portion. The VS of bagalunga was stable across axial position, whereas teak and mahogany decreased by 10.3% and 28.6%, respectively. In terms of radial position, a significant decrease in GMC was observed from pith to bark, ranging from 9.46% to 26.99% across species. On the other hand, SG increased towards the bark portion. Bagalunga displayed the highest RS and VS at the bark, while teak showed the lowest. Based on their physical properties, bagalunga, being dimensionally stable, is suited for non-structural applications, while mahogany can be used for structural applications, cabinetry, and furniture, and teak is optimal for high-value products. Keywords: Melia azedarach, specific gravity, Swietenia macrophylla, Tectona grandis, volumetric shrinkage
Cooling Rates of Mahogany (Swietenia macrophylla King.) and Yemane (Gmelina arborea Roxb.) Determined by Infrared Thermography and Its Relationship to Density Rana, Prince Ranier Cacaos; Marasigan, Oliver Segundo
Jurnal Sylva Lestari Vol. 14 No. 1 (2026): January
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v14i1.1256

Abstract

Determining wood density is essential for assessing its mechanical properties and industrial suitability, yet traditional methods are destructive and impractical for standing trees or finished products. This study investigates the application of infrared thermography (IRT) as a rapid, nondestructive method for estimating wood density from cooling behavior. Mahogany (Swietenia macrophylla King.) and yemane (Gmelina arborea Roxb.), two economically important plantation species in the Philippines, were examined under controlled heating and natural cooling conditions. Twelve samples with varying densities at 60°C were analyzed, and their cooling curves were modeled using the first-term transient plane-wall solution. A strong inverse correlation was found between density and cooling rate constant (kapp with coefficients of determination (R²) values of 0.90 for mahogany and 0.97 for yemane, confirming that denser samples cooled more slowly. Additionally, a 21% difference in cooling rates between mahogany and yemane at similar densities suggests that species-specific characteristics may influence heat loss. These results demonstrate the potential of IRT as a rapid, nondestructive tool for estimating wood density, with applications in timber grading, quality assessment, and forest resource monitoring; accordingly, this approach could be adapted for rapid on-site density estimation in timber grading and monitoring. Keywords: Gmelina arborea, infrared thermography, nondestructive testing, rate of cooling, Swietenia macrophylla