Growth responses, physiology and decay associated with pruning plantation-grown Eucalyptus globulus Labill. and E. nitens (Deane and Maiden) Maiden

Pinkard, EA; Mohammed, CL; Beadle, C. L.; Hall, M.F.; Worledge, Dale; Mollon, AD

doi:10.1016/j.foreco.2004.07.004

Cited by 36 publications

(35 citation statements)

References 19 publications

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“…While highly ranked, the impact was more severe for E. globulus. The presence of these defects in the peeled veneer supports the findings of previous research studies, which have shown that these species may not heal well after pruning or self-pruning, with the section of stem-wood laid down post-prining being prone to decay entry and slow occlusion (Wardlaw and Neilson 1999;Pinkard 2002;Pinkard et al 2004;Deflorio et al 2007).…”

Section: Visual Gradingsupporting

confidence: 84%

“…The presence of defects, including bark pockets and decay, which were mostly associated with knots, encased knots, surface roughness, and gum pockets in similar proportions across all sites, suggest that at the Deans Marsh site the pruning had not been effective in allowing clear wood to be produced. This may be due to suboptimal pruning techniques, timing and procedures, and/or may be a physiological characteristic of this species (Wardlaw and Neilson 1999;Pinkard 2002;Pinkard et al 2004;O'Hara 2007;Deflorio et al 2007). An additional influence may be the below average rainfall (665 mm in 2004, 709 mm in 2005, and 474 mm in 2006 recorded at the site compared with a 852 mm long-term average) the Deans Marsh site received for the three years following the last pruning.…”

Section: Visual Gradingmentioning

confidence: 99%

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Variation in Rotary Veneer Recovery from Australian Plantation Eucalyptus globulus and Eucalyptus nitens

McGavin¹,

Baillères²,

Hamilton³

et al. 2014

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The processing of Australian plantation-grown Eucalyptus globulus and E. nitens into rotary veneer was shown to produce acceptable recoveries. Three plantation sites for each species were sampled. Silvicultural treatments (thinning and pruning) and growing environments varied between sites. Graded veneer recoveries were dominated by Dgrade veneer across all six sites. Variation between the E. nitens sites was evident, with recoveries differing between sites reflecting silvicultural treatments. However, only minimal variation in recovery was shown between the E. globulus sites. The presence of similar levels of defects across all E. globulus sites indicates that the intensive silvicultural management at one site studied was not effective in the production of clear wood, and may possibly have adversely affected grade recovery. Veneer value analysis demonstrated only minimal differences between E. globulus sites. More variation was observed in the E. nitens value analysis; however, intensive silvicultural management implemented did not necessarily result in higher veneer value.

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Section: Visual Gradingsupporting

confidence: 84%

Section: Visual Gradingmentioning

confidence: 99%

Variation in Rotary Veneer Recovery from Australian Plantation Eucalyptus globulus and Eucalyptus nitens

McGavin¹,

Baillères²,

Hamilton³

et al. 2014

BioResources

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“…The other critical information necessary to assess the impact of pruning on veneer grading is the branch occlusion thickness before the tree produces wood free of knots and knot-related defects. According to the studies performed by Montagu et al (2003), Pinkard et al (2004), Smith et al (2006), O'Hara (2007), Liu et al (2012), and Forrester et al (2013), the occlusion thickness can be estimated depending on the type of species. For the fast-growing pulp species in this study (E. dunnii and E. globulus), the occlusion thickness is on average 2 cm.…”

Section: Grade Scenariosmentioning

confidence: 99%

Veneer Grade Analysis of Early to Mid-rotation Plantation Eucalyptus Species in Australia

McGavin¹,

Baillères²,

Lane³

et al. 2014

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aProcessing Australian hardwood plantations into rotary veneer can produce more acceptable marketable product recoveries compared to traditional processing techniques (e.g. sawmilling). Veneers resulting from processing trials from six commercially important Australian hardwood species were dominated by D-grade veneer. Defects such as encased knots, gum pockets, gum veins, surface roughness, splits, bark pockets, and decay impacted the final assigned grade. Four grading scenarios were adopted. The first included a change to the grade limitations for gum pockets and gum veins, while the second investigated the potential impact of effective pruning on grade recovery. Although both scenarios individually had a positive impact on achieving higher face grade veneer qualities, the third and fourth scenarios, which combined both, had a substantial impact, with relative veneer values increasing up to 18.2% using conservative calculations (scenario three) or up to 22.6% (scenario four) where some of the upgraded veneers were further upgraded to A-grade, which attracts superior value. The total change in veneer value was found to depend on the average billet diameter unless defects other than those relating to the scenarios (gum or knots) restricted the benefit of pruning and gum upgrading. This was the case for species prone to high levels of growth stress and related defects.

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“…Additionally, it is possible that observed longitudinal trends in some traits are not representative of what would occur under solidwood silviculture. For example, the extent of decay in some height categories might have been different if the trial had been thinned and pruned [25,36,37].…”

Section: Longitudinal Variationmentioning

confidence: 99%

Les variations longitudinales intra-arbre des propriétés papetières et du bois varient entre les génotypes d’Eucalyptus globulus

et al. 2007

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-Wood discs were sampled from 6 heights up the stem of 248 trees representing 10 subraces and 116 families grown in an E. globulus base-population progeny trial. The lower stem had the least favourable wood properties for kraft pulpwood and most solidwood applications: bark was thickest, basic density was lowest and kino, decay and shrinkage traits were greatest at or below 12% of tree height. Significant genetic differences at the subrace level were revealed in diameter, bark thickness, basic density, decay and gross shrinkage and at the family within subrace level in diameter, basic density and decay. However, subrace-by-height-category interactions in bark thickness, basic density, decay and gross shrinkage indicated that differences among subraces were dependent on height in these traits. Examination of longitudinal trends revealed some evidence that the zone of thick basal bark extended further up the stem in thicker-barked subraces and that the Southern Tasmania subrace might be less effective than other subraces in restricting the longitudinal spread of decay after infection.wood properties / Eucalyptus globulus / longitudinal variation / within-tree variation / genetic variation Résumé -Les variations longitudinales intra-arbre des propriétés papetières et du bois varient entre les génotypes d'Eucalyptus globulus. Des disques de bois ont été prélevés à 6 hauteurs différentes dans 248 arbres représentant 10 provenances et 116 familles d'un dispositif de provenancedescendance d'E. globulus. La partie inférieure des troncs présente les propriétés du bois les moins bonnes pour la pâte Kraft et la plupart des utilisations du bois massif : l'écorce est plus épaisse, l'infradensité plus faible tandis que le lino, la dégradation biologique et les retraits sont plus importants jusqu'à 12 % de la hauteur des tiges. Des différences génétiques significatives ont été établies au niveau provenance pour le diamètre, l'épaisseur d'écorce, l'infradensité et la dégradation biologique et au niveau famille dans une provenance pour l'infradensité et la dégradation biologique. Cependant, pour ces propriétés, les interactions provenance par catégorie de hauteur, pour l'épaisseur d'écorce, l'infradensité, la dégradation biologique et le retrait total, indiquent que les différences entre provenances dépendent de la hauteur. L'analyse des variations longitudinales fait apparaître que la longueur de la bille de pied ayant une écorce plus épaisse est plus importante pour les provenances présentant des écorces épaisses et que les provenances de sud de la Tasmanie pourraient être moins efficaces que les autres pour limiter la diffusion des pourritures après infection.propriétés du bois / variation longitudinale / variation intra arbre / variation génétique / Eucalyptus globulus

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Growth responses, physiology and decay associated with pruning plantation-grown Eucalyptus globulus Labill. and E. nitens (Deane and Maiden) Maiden

Cited by 36 publications

References 19 publications

Variation in Rotary Veneer Recovery from Australian Plantation Eucalyptus globulus and Eucalyptus nitens

Variation in Rotary Veneer Recovery from Australian Plantation Eucalyptus globulus and Eucalyptus nitens

Veneer Grade Analysis of Early to Mid-rotation Plantation Eucalyptus Species in Australia

Les variations longitudinales intra-arbre des propriétés papetières et du bois varient entre les génotypes d’Eucalyptus globulus

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