NDLI: High resolution temporal variation in wood properties in irrigated and nonirrigated Eucalyptus globulus

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Annals of Forest Science : Volume 66, Issue 3, January 2009

Annals of Forest Science : Volume 66, Issue 2, January 2009

Annals of Forest Science : Volume 66, Issue 1, January 2009

Annals of Forest Science : Volume 65

Annals of Forest Science : Volume 64

High resolution temporal variation in wood properties in irrigated and nonirrigated Eucalyptus globulus

Content Provider	Springer Nature Link
Author	Drew, David M. Downes, Geoffrey M. O’Grady, Anthony P. Read, Jennifer Worledge, Dale
Copyright Year	2009
Abstract	• Environmental determinants of wood properties variation were examined in Eucalyptus globulus, a globally important hardwood plantation species, in southern Tasmania, Australia. • Radial variation in wood properties, measured with the SilviScan system, were re-scaled from distance to time abscissa using stem radial growth data measured with dendrometers. With this re-scaled data it was possible to evaluate how water availability and temperature affected wood density, microfibril angle (MFA) and fibre and vessel transverse dimensions in irrigated and non-irrigated trees. • Wood density, fibre radial diameter and MFA were sensitive to water availability. Wood density increased and fibre radial diameter decreased in response to reduced water availability. When high water availability was maintained, wood density was negatively correlated with temperature. Together, temperature and soil matric potential explained about 60% of temporal variation in wood density variation. In contrast MFA was not related to temperature but decreased with increasing water stress. Slower growing trees also had lower MFA than faster growing trees. Slower growing trees had a larger number of vessels per unit area of wood than faster growing trees within this even aged stand. However, vessel radius to the 4th power was significantly higher in faster growing trees than in slower growing trees. • Overall, E. globulus wood properties were sensitive to temporal changes in environmental conditions (particularly water availability) and associated growth rates. The data provided support for the hypothesis that growth rates are hydraulically mediated. • Nous avons analysé les déterminants environnementaux des variations des propriétés du bois d’Eucalyptus globulus qui est une importante essence feuillue de plantation du sud de la Tasmanie en Australie. • La variation radiale des propriétés du bois — mesurées avec l’outil Silviscan — a été convertie en variation temporelle par le biais des mesures de la croissance radiale obtenues avec des dendromètres. Avec ces données recalibrées il a été possible d’évaluer comment la disponibilité en eau et la température ont affecté la densité du bois, l’angle des microfibrilles ainsi que les dimensions transversale des fibres et vaisseaux pour les arbres irrigués et non irrigués. • La densité du bois, le diamètre radial des fibres et l’angle des microfibrilles sont sensibles à la disponibilité en eau. En réponse à une réduction de la disponibilité en eau on observe que la densité du bois augmente et le diamètre radial des fibres diminue. Lorsqu’un niveau élevé de disponibilité en eau est maintenu alors la densité du bois apparaît négativement corrélée avec la température. La température et le potentiel matriciel du sol expliquent ensemble environ 60 % de la variation temporelle de la densité du bois. À l’inverse l’angle des microfibrilles n’est pas relié à la température mais il décroît lorsque le stress hydrique augmente. Les arbres à croissance lente ont également un angle des microfibrilles plus faible que les arbres à croissance rapide. Au sein des peuplements équiennes, les arbres à croissance lente on un plus grand nombre de vaisseaux par unité de surface du bois que les arbres à croissance plus rapide. Cependant la puissance quatrième du rayon des vaisseaux est significativement plus élevée pour les arbres à croissance rapide que pour les arbres à croissance lente. • Dans l’ensemble les propriétés du bois d’ E. globulus sont sensibles aux variations temporelles des conditions environnementales (en particulier la disponibilité en eau) et sont associées aux taux de croissance. Les données fournies confirment l’hypothèse que les taux de croissance sont régulés hydrauliquement.
Starting Page	406
Ending Page	406
Page Count	1
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	66
Issue Number	4
e-ISSN	1297966X
Language	French
Publisher	Springer Netherlands
Publisher Date	2009-01-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	développement du xylème dendromètres taux de croissance à haute résolution hydraulique des plantes Forestry Wood Science & Technology Forestry Management Tree Biology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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