Within and Between-Tree Variation of Bark Content and Wood Density of Eucalyptus Globulus in Commercial Plantations

Quilhó, Teresa; Pereira, Helena

doi:10.1163/22941932-90000283

Cited by 53 publications

(51 citation statements)

References 13 publications

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“…1) were consistent with previous findings for E. globulus [19,28,30]. The distinct peak in decay at breast height observed in the sampled group of trees was almost certainly caused by fungi that infected stems through wounds associated with previous sampling for wood property assessment (Fig.…”

Section: Longitudinal Variationsupporting

confidence: 91%

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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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Section: Longitudinal Variationsupporting

confidence: 91%

“…Longitudinal variation in diameter, bark thickness, basic density and shrinkage traits has previously been studied in E. globulus [16,19,28,30,31,41]. However, with the exception of Guimaraes et al [16], these studies did not investigate if patterns of longitudinal variation differed among intra-specific genotypes.…”

Section: Introductionmentioning

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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“…According to these authors, the basic density of Eucalyptus grandis decreases from base to breast height, then increases slightly up to 75%, and after that follows a decreasing tendency up to the apex. Similar trends were reported by other authors (Raymond and Muneri, 2001;Quilhó and Pereira, 2001). Working with several Eucalyptus species, Clark (2001) observed different longitudinal density profiles.…”

Section: Introductionsupporting

confidence: 85%

Variation of some wood macroscopic properties along the stem of Acacia melanoxylon R. Br. adult trees in Portugal

Santos¹,

Simões²,

Tavares³

2013

For. syst.

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Aim of the study: The aim of the study is to assess the variation of pith eccentricity, heartwood proportion, latewood percentage and basic wood density along the stem of 45-year-old A. melanoxylon trees collected in four sites of Portugal, and investigate the eventual relationship between these variables.Area of study: Sites covering littoral north, mid interior north and centre interior of Portugal. Materials and methods:Four sites and five trees per site were selected in the Acacia melanoxylon Portuguese forest. One wood sample at each of six height levels per tree was collected in order to evaluate its basic density, pith eccentricity, heartwood and latewood proportions.Main results: The high variability of the wood macroscopic properties among trees from the same site regarding to the variation of the corresponding average properties along the stem is a key characteristic of the experimental data. As a consequence, a multiple linear regression model tested was not able to properly explain the wood basic density variation of the 120 wood samples analysed. In spite of this, the following trends could be recognized: (i) excluding the base level, wood basic density moderately increased with tree level; (ii) latewood proportion followed similar behaviour; (iii) pith eccentricity was low; (iv) heartwood proportion decreased markedly with tree height, from 70% at the base to 7% at the top.Research highlights: The high basic density, the relatively low variability along the stem and the low pith eccentricity enable us to anticipate good performance as raw material for the wood industry.

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“…According to Meyer et al (1981), the density of inner bark may be lower than the density of outer bark, thus differences in the bulk density of bark between species may be related to different proportions of rhytidome to inner bark. According to Quilhó & Pereira (2001), bulk density of bark along the stems of individual trees is less varied. These authors demonstrated that possible differences in the density of bark of Eucalyptus globules Labill.…”

Section: Discussionmentioning

confidence: 99%

“…However, considering the strong dependence of bark hygroscopicity on its physical properties (Fig. 3) as well as the low variation of bark bulk density along the stems of individual trees (Quilhó & Pereira 2001), it may be assumed that the vertical variation of bark hygroscopicity could be very small, while its share in total water storage capacity should increase with the height along the stem.…”

Section: Iforest -Biogeosciences and Forestrymentioning

confidence: 99%

Hygroscopicity of the bark of selected forest tree species

Ilek¹,

Kucza²,

Morkisz³

2017

iForest

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As the outer layer of trees and shrubs, bark is exposed to the direct action of atmospheric conditions and reacts to changes in relative air humidity. This study focuses on the actual hygroscopicity of the bark, regarded as a component of the total bark retention capability. The main research aims were to: (1) determine the physical properties (specific density, bulk density, total porosity), actual hygroscopicity and maximum water storage capacity of the stem bark at breast height (1.3 m) of eight forest tree species; (2) assess the relationship between bark actual hygroscopicity and its physical properties; (3) determine the share of the actual hygroscopicity of bark in its maximum water storage capacity. Significant differences were observed among the different species considered as a consequence of the variation in physical properties of their bark. Actual hygroscopicity of bark (expressed in balance units), i.e., the maximum water amount that can be absorbed from saturated air by the outer bark layer, showed a significant relationship with bark physical properties. Depending on tree species, actual hygroscopicity may constitute from 10 to 30% of the maximum water storage capacity of bark.

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Within and Between-Tree Variation of Bark Content and Wood Density of Eucalyptus Globulus in Commercial Plantations

Cited by 53 publications

References 13 publications

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

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

Variation of some wood macroscopic properties along the stem of Acacia melanoxylon R. Br. adult trees in Portugal

Hygroscopicity of the bark of selected forest tree species

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