Agriculture, Forestry and Fisheries
Volume 2, Issue 2, April 2013, Pages: 105-109
Received: Mar. 12, 2013;
Published: Apr. 2, 2013
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Ronnie Mmolotsi, Department of Crop Science and Production. Botswana College of Agriculture. Private Bag 0027, Gaborone, Botswana
Kealeboga Kejekgabo, Department of Crop Science and Production. Botswana College of Agriculture. Private Bag 0027, Gaborone, Botswana
A study was carried out to evaluate physical properties of wood of four indigenous tree species. Samples were obtained at random from the logs at a timber and wood processing yard. Acacia burkea and S. Africana possess heartwood that is distinctly different in colour from the sapwood. Acacia burkeashowed very dark colour in the heartwood while that of Spirostachys africana was dark greyish brown in colour. Wood of P. africanum and Terminelia serecia displayed no distinctly different colours between the sapwood and the heartwood. Density also varied in different woods with the highest density values recorded at 0.97 g cm3 in the A. burkeaand the lowest was 0.70 g cm3 in P. africanum. There were significant differences in densities between wood of all these species. The highest change in dimensions was recorded in the tangent side of all woods except for A. burkea. The highest dimensional changes were recorded at 9.02± 4.02 percentin the tangent side of P. africanum. The lowest dimensional changes were recorded at 0.41±0.08 percent in the longitudinal section of the P. africanumwood. Overall the lowest changes were recorded in the longitudinal side of wood.
Physical Properties of Wood in Selected Lessor Known Tree Species in Botswana, Agriculture, Forestry and Fisheries.
Vol. 2, No. 2,
2013, pp. 105-109.
Stats Bots (2013). Botswana international merchandise trade statisticsmonthly digest - December 2012. www.cso.bw. Accessed 04/03/2013
Kejekgabo, K. (2012). Personal communication
Ali, A. C., Uetimane, Jr, E., Lhate, I. A. and Terziev, N. (2008). Anatomical characteristics, properties and use of traditionally used and lessor known wood species from Mo-zambique: a literature review. Wood Sci. Tech, 42: 453 – 472
Mmolotsi, R., Lumbile, A., Kwerepe, B. C., Kopong, I., Rampart, M., Segwagwe, A., Sebolai, B., Lekorwe, L. and Maphane, T. (2011). Effect of sap deposition on properties of sapwood in Pterocarpus angolensis (Mukwa) following bark stripping by elephants in Chobe forest reserves in northern Botswana. Bots. J. of Agric. and Appl. Scie., 7(1), 107 - 111
Climent, J., Gil, L. and Pardos, J. (1993). Heartwood devel-opment and its relationship to growth and environment in Pinus canariensis Chr. Sm ex DC. For. Ecol. Man, 59, 163 - 174
Knapic, S., Tavares, F. and Pereira, H. (2006). Heartwood and sapwood variation in Acacia melanoxylon R. Br. Trees in Portugal. For., 79(4), 371 – 380.
Desch, H. E. and Dinwoodie, J. M. (1996). Timber: Structure, Properties, Conversion and Use. 7th edition. Macmillan Press, London
Barbosa, R. I and Fearside, P. M. (2004). Wood density of trees in open savannahs of the Brazilian Amazon. For. Ecol an.d Man, 199, 115 – 123.
Mmolotsi, R. (2004). Potential Uses of Alnus rubra in Sil-vopastoral Systems. PhD Thesis, University of Wales
Mmolotsi, R. M. and Teklehaimanot, Z. (2006). The effectof initial tree-plant density on timber and wood-fuel properties of red alder and sycamore. Canadian J. For. Res., 36, 1475 – 1483
Chafe, S. C. (1994). Relationship between shrinkage and specific gravity in the wood of eucalyptus. Aust. For., 57, 59 – 61.
Chowdhury, Md, Q., Manzoor Rashid, A. Z. M., Newaz, Md S. and Alam, A. (2007). Effect of height on physical proper-ties of wood of jhau (Casuarina equisetifolia). Aust. For., 70(1), 33 – 36.
Innes, T. C. (2005). Processing and material properties of Tasmanian yellow gum, Eucalyptus johnstonii. Aust. For., 68(2), 121-125
McComb, J. A., Meddlings, R. A., Siemon, G. and Davis, S. (2004). Wood density and shrinkage of five-year old Euca-lyptus camadulensis x E. globulus hybrids: a preliminary as-sessment. Aust. For., 67 (4), 236-239.
Kokutse, A. D., Bailleres, H., Stokes, A. and Kokou, K. (2004). Proportion and quality of heartwood of Togolese teak (Tectona grandis LF). For. Ecol. Man., 189: 37 – 48.
Searle, S. D. and Owen, J. V., (2005). Variation in basic wood density and percentage heartwood in temperate Aus-tralian Acacia species. Aust. For., 68(2): 126 – 136.