Wood Properties of 7-Year-Old Brachypterum microphyllum Planted in Malaysia

This study examined the wood properties, i.e. anatomical characteristics, chemical composition, physical and mechanical properties of seven-year-old plantation-grown B. microphyllum harvested from a research plot at the Forest Research Institute Malaysia. Microscopic analysis revealed diffuse-porous wood with very large solitary vessels, aliform to confluent parenchyma, medium-sized rays, and non-septate fibres. Fibre morphology showed a Runkel ratio below 1.0 and a slenderness ratio of 41.9, indicating favourable fibre flexibility and bonding potential. The absence of tyloses and silica suggests good treatability and machinability. Chemical analysis showed high holocellulose content (79.5–81.9%), α-cellulose (~44%), moderate lignin (22.6–23.9%), and low extractives (0.9–2.1%), indicating a substantial carbohydrate fraction with minimal non-structural compounds. Preliminary phytochemical screening detected flavonoids, tannins/polyphenols, and triterpenes/steroids as dominant constituents, supporting its traditional medicinal relevance. The wood density ranged from 441.4 to 606.8 kg m⁻³ (mean: 524.1 kg m⁻³), classifying the timber as light to moderately heavy. Shrinkage at 15% moisture content was 2.2% (tangential), 1.2% (radial), and 0.6% (longitudinal), giving a tangential-to-radial ratio of 1.6 and indicating moderate dimensional stability. Despite being harvested at only seven years of age, B. microphyllum exhibited mechanical properties comparable to or superior to several commonly planted fast-growing species, such as Eucalyptus nitens, rubberwood (Hevea brasiliensis), and batai (Paraserianthes falcataria). In particular, the bending and shear strengths were considerably higher than those reported for some older plantation timbers. These findings suggest that B. microphyllum has strong potential as a fast-growing plantation timber with favourable strength characteristics and other promising properties, making it a suitable candidate for structural and value-added wood applications.