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SPECIFIC GRAVITY AND MECHANICAL PROPERTIES OF ANINGERIA ROBUSTA WOOD FROM NIGERIA

OO Ajala and OY Ogunsanwo
Journal of Tropical Forest Science
Vol. 23, No. 4 (October 2011), pp. 389-395
Stable URL: http://www.jstor.org/stable/23617051
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SPECIFIC GRAVITY AND MECHANICAL PROPERTIES OF ANINGERIA ROBUSTA WOOD FROM NIGERIA
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Abstract

Sourcing of choice timber species is becoming increasingly difficult in the forests of West Africa including Nigeria. There is a need to provide alternative species by investigating the technical qualities of species that are hitherto not harvested. Six trees of Aningeria robusta were sampled at the base, 10, 30, 50, 70 and 90% of merchantable length and partitioned into the inner, middle and outer wood along the radial plane. Specific gravity (SG) and selected mechanical properties, namely, modulus of rupture (MOR), compressive strength parallel to grain (MCS) and impact bending (IB) were investigated. Data were analysed using analysis of variance. The overall mean SG was 0.44, while the mean values for MOR, MCS and IB were 89.05 N mm-2, 27.45 N mm-2 and 0.2 m respectively. Significant variations existed between sampling heights in SG and MOR, while variations in MCS and IB were not significant along the bole. For all properties investigated, no significant variation was found from the inner to the outer wood. The wood properties of this species indicate that it has the potential to substitute some popular species in the market. Its radial and axial uniformity may be exploited in marketing strategy. Pencarian spesies kayu pilihan daripada hutan di Arika Barat termasuk Nigeria semakin sukar. Oleh itu, kita perlu mengkaji kualiti teknikal spesies-spesies yang sehingga kini masih belum dieksplotasi untuk mencari spesies alternatif. Enam pokok Aningeria robusta disampel pada dasar, 10%, 30%, 50%, 70% and 90% daripada panjang boleh niaga dan dipotong kepada bahagian luar, tengah dan dalam sepanjang permukaan jejari. Graviti spesifik (SG) dan ciri-ciri mekanik terpilih iaitu modulus kepecahan (MOR), mampatan selari ira (MCS) dan lentur hentaman (IB) dikaji. Data dianalisis menggunakan analisis varians. Purata SG ialah 0.44 manakala purata MOR, MCS dan IB masing-masing 89.05 N mm-2, 27.45 N mm-2 dan 0.2 m. Perbezaan signifikan wujud antara ketinggian dengan SG dan MOR tetapi tidak dengan MCS dan IB. Tiada perbezaan signifikan diperhatikan antara kayu bahagian dalam, tengah dan luar untuk kesemua ciri yang dikaji. Ciri-ciri kayu menunjukkan yang spesies tersebut berpotensi menggantikan sesetengah spesies popular dalam pasaran. Keseragaman jejari dan paksi spesies ini boleh dijadikan daya penarik semasa pemasaran.

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