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Friday 29 July 2016

Density variation in Bayur (Pterospermum sp.), Randagong (Trema orientalis) and Magas (Duahanga moluccana) from Sabah, Malaysia

Published Date

Volume 56, Issue 4, pp 221-222
First online: 

Title 

Density variation in Bayur (Pterospermum sp.), Randagong (Trema orientalis) and Magas (Duahanga moluccana) from Sabah, Malaysia

  • Author 
  • M. Trockenbrodt
  • Y. Nasrah
  • K. Misalam

Abstract

The lesser utilised timbers Bayur (Pterospermum sp.), Randagong (Trema orientalis) and Magas (Duahanga moluccana) were analysed with regard to the variation of the wood density (ovendry and at 14% moisture content). The average ovendry density of the different individuals varies from 0.36–0.43 g/cm3 in Bayur, from 0.24–0.38 g/cm3 in Randagong and from 0.26–0.35 g/cm3 in Magas. The corresponding values for the density at 14% moisture content are 0.38–0.49 g/cm3 in Bayur, 0.29–0.41 g/cm3 in Randagong and 0.27–0.35 g/cm3 in Magas. All trees show an increase in density from the centre of the stem to the periphery. The differences between height levels are not significant.

Die Variabilität der Rohdichte in Bayur (Pterospermum sp.), Randagong (Trema orientalis) and Magas (Duabanga moluccana) aus Sabah, Malaysia

Zusammenfassung

Die nicht intensiv genutzten Holzarten Bayur (Pterospermum sp.), Randagon (Trema orientalis) and Magas (Duabanga moluccana) wurden hinsichtlich der Variabilität der Rohdichte (darrtrocken und bei 14% Holzfeuchte) untersucht. Die durchschnittliche Rohdichte (darrtrocken) der verschiedenen Individuen variiert von 0.36–0.43 g/cm3 in Bayur, von 0.24–0.38 g/cm3 in Randagong und von 0.26–0.35 g /cm3 in Magas. Die entsprechenden Werte der Rohdichte bei 14% Holzfeuchte sind 0.38–0.49 g/cm3 in Bayur, 0.29–0.41 g/cm3 in Randagong und 0.27–0.35 g/cm3 in Magas. In allen Individuen steigt die Rohdichte vom Stamminneren zur Peripherie hin an. Unterschiede zwischen verschiedenen Stammebenen sind nicht signifikant.

References

  1. Dahms KG (1982) Asiatische, ozeanische und australische Exporthölzer. DRW-Verlag, Stuttgart
  2. Lemmens RHMJ, Soerianegara I, Wong WC (eds.) (1995) Timber trees: Minor commercial species. Plant Resources of South-East Asia No. 5(2). PROSEA, Bogor, Indonesia
  3. Wiemann MC, Williamson GB (1989) Radial gradients in the specific gravity of wood in some tropical and temperate trees. For Sci 35: 197–210
  4. Zobel BJ, van Buijtenen JP (1989) Wood variation — Its causes and control (Springer series in wood science). Springer, Berlin Heidelberg New York
  5. Wong TM (1982) A dictionary of Malaysian timbers. Malaysian Forest Records No. 30. Forest Department, Kuala Lumpur

For further details log on website :
http://link.springer.com/article/10.1007/s001070050304

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