Quality of sawntimber Acacia mangium Willd. from planting by agro-forestry practices
1998
Sutee Visuthitepkul (Royal Forest Dept., Bangkok (Thailand). Forest Research Office. Forest Products Research Div.)
Twelve logs of seven-years old Acacia mangium Willd.; which have diameter 18-30 cm (average 20 cm) showed lumber recovery approximately 35.6 percent. There are fifty percent of heart lumber which is 0.5-1.5 cm in width and average heart length 33.8 cm per one meter. Warping of sawntimbers after air seasoning bow, crook and twist are 3.7, 2.5, and 4.0 mm. pre one-meter length respectively. Most of knots are sound knot, average size is 3.2 cm. In diameter and compose of 2.98 knots per one-meter length of tested sawntimber. Heartwood is dark brown and sapwood is whitish yellow. The heartwood occupy 66 percent of the cross section area which averages from dish diameters varied from 16.7-28.2 cm The physical properties are as follow ; air-dry density at 12 percent, moisture content is 0.57 g/cubic cm, basic density 0.49 g/cubic cm. Shrinkage from green to air-dry, T-shrinkage (1.9-3.8 percent) average 3.05 percent, R-shrinkage (0.7-2.2 percent) average 1.3 percent and shrinkage from green to oven-dry, T-shrinkage (4.1-7.3 percent) average 6.12 percent R-shrinkage (1.8-3.8 percent) average 2.8 percent. A mangium has fine texture, straight-interlocked grain, machining properties are easy to medium. The strength properties of A. mangiumis is similar to teak from plantation. Generally, A. mangium timber is suitable for furniture, flooring, joinery products, frame, household utensil, toy, carving and turning.
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