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The effect of initial tree-planting density on timber and wood-fuel properties of red alder and sycamore

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Studies on red alder (Alnus rubra Bong.) and sycamore (Acer pseudoplatanus L.) were carried out to assess their timber and wood-fuel properties when grown at wide spacing as in a silvopastoral system. Initial tree-planting density had significant effects on the modulus of elasticity (MOE) in red alder and compression strength in sycamore. Wood samples taken from red alder in high-density plots of 2500 stems·ha–1 had a significantly higher MOE than those from trees in low-density plots of 400 stems·ha–1 (silvopastoral system). Sycamore wood from the high-density plots had significantly higher compression strength than that from the low-density plots. However, there was no significant effect of planting density on the modulus of rupture in either species. On average, red alder had lower wood density, modulus of rupture, and compression strength than sycamore, but there was no significant difference in MOE between the two species. Planting density did not have any effect on the wood-fuel higher heating value of either red alder or sycamore, nor was there a significant difference in wood-fuel higher heating value between the two species. However, red alder wood had a significantly higher fuel-value index than sycamore, owing to its lower ash content.

Des études sur Alnus rubra Bong. (aulne rouge) et Acer pseudoplatanus L. (érable sycomore) ont été réalisées afin d'évaluer leurs propriétés comme bois d'œuvre et bois de feu lorsque ces essences sont cultivées dans un système sylvopastoral avec un grand espacement. La densité initiale de plantation des arbres a eu des effets significatifs sur le module d'élasticité (MOE) de l'aulne rouge et sur la résistance à la compression de l'érable sycomore. Les échantillons de bois prélevés chez l'aulne rouge dans les parcelles à forte densité, 2500 tiges·ha–1, avaient un MOE significativement plus élevé que les arbres dans les parcelles à faible densité, 400 tiges·ha–1 (système sylvopastoral). Le bois de l'érable sycomore avait une résistance à la compression significativement plus élevée dans les parcelles à forte densité comparativement aux parcelles à faible densité. Cependant, la densité de plantation n'a pas eu d'effet significatif sur le module de rupture (MOR) chez ni l'une ni l'autre des espèces. En moyenne, le bois de l'aulne rouge avait une densité, un MOR et une résistance à la compression plus faible que ceux de l'érable sycomore. Par contre, le MOE des deux espèces n'était pas significativement différent. La densité de plantation n'a eu aucun effet sur le pouvoir calorifique supérieur (PCS) du bois de feu de l'aulne rouge et de l'érable sycomore. Le PCS du bois de feu des deux espèces n'était pas significativement différent. Cependant, le bois de l'aulne rouge avait un indice de valeur combustible significativement plus élevé que celui de l'érable sycomore à cause de son plus faible contenu en cendre.

[Traduit par la Rédaction]

Document Type: Research Article

Publication date: June 1, 2006

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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