Prévision de la variabilité intra- et interarbre de la densité du bois de chêne rouvre (Quercus petraea Liebl) par modélisation des largeurs et des densités des bois initial et final en fonction de l'âge cambial, de la largeur de cerne et du niveau dans l'arbre

Degron, Robin; Nepveu, Gérard

doi:10.1051/forest:19960509

Cited by 21 publications

(26 citation statements)

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“…These findings corroborate Paul (1963) studies in unmanaged stands of Q. alba and Q. velutina, where the variation in density was significantly related to changes in ring width with increasing tree age as well as in managed stands (Zhang et al, 1993;Degron & Nepveu, 1996;Guilley et al, 1999). Zhang (1994) concluded that in ring-porous species, ring width had little influence on density while other studies refer to inconsistent relationships between ring width and wood density for other oaks (Polge & Keller, 1973).…”

Section: Rd Ewd Lwd Ewwsupporting

confidence: 79%

“…: Q. suber (Knapič et al, 2008), Q. petraea (Degron & Nepveu, 1996;Guilley et al, 1999) and Q. garryana (Lei et al, 1996). Explanations for the decrease in wood density with increasing tree age have been suggested to be related with the crown effects on latewood formation inhibition leading to lower values of density in the upper levels of the stem based mostly in softwoods (Saranpaa, 2003).…”

Section: Rd Ewd Lwd Ewwmentioning

confidence: 99%

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Age trends and within-site effects in wood density and radial growth in Quercus faginea mature trees

2016

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Aim of the study: This paper aims to valorize the wood of Quercus faginea Lam. for high quality end uses (e.g. furniture) by studying growth and quality properties using mature trees. Age trends in tree-ring width and wood density are shown and the main factors responsible for variations in tree-ring width and wood density within and between trees are investigated.Area of study: The study site is in the center of Portugal within the natural species distribution area. Material and methods:Radial samples from ten mature trees were collected at 6 heights (from base to 9.7 m) and prepared for X-ray microdensity.Main results: Wood density showed high values, ranging from 0.868 g/cm 3 to 0.957 g/cm 3 . Wood density decreased from pith to bark and with stem height. Cambial age showed a linear relationship with wood density and most of the variation in wood is explained by age. Intra-ring and axial within-tree homogeneity was good.Research highlights: Mature trees of Q. faginea showed high wood density and a high potential for high quality end uses, comparable to other oaks. Wood density is influenced by cambial age and tree-ring width. Wood quality may be improved by tree growth rates adjustment e.g. through an adequate tree stand density (e.g. thinning operations).Keywords: Quercus faginea; wood density components; cambial age; wood quality; variation. Citation: Sousa, V.B., Louzada, J.L., Pereira, H. (2016). Age trends and within-site effects in wood density and radial growth in Quercus faginea mature trees. Forest Systems, Volume 25, Issue 1, e053. http://dx

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Section: Rd Ewd Lwd Ewwsupporting

confidence: 79%

Section: Rd Ewd Lwd Ewwmentioning

confidence: 99%

Age trends and within-site effects in wood density and radial growth in Quercus faginea mature trees

2016

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“…Total ring, earlywood and latewood ring-widths averaged 0.97, 0.42 and 0.55 mm, respectively. As previously known [14,22,53,54], latewood proportion ranged from 80 to 50% of total ring width according to cambial age (between 10 and 320 years) (Fig. 3) and there was a strong positive correlation between the total tree-ring width and latewood width (r 2 = 97%).…”

Section: Ring Characteristics Of Cored Oaksmentioning

confidence: 57%

“…The oak ring width is usually considered as a good indicator of wood quality because wood properties (density, shrinkage, machinability…) are closely correlated with ring widths [39][40][41]. Thus, wide rings (> 1.5-2 mm) correspond to denser wood which is less favourable to veneer production (the main use of oak wood) because denser wood in this species is associated with higher shrinkage and machinability [14,53,54]. Thus, from this point of view, this oak grove can be considered as a high quality stand for veneer production.…”

Section: Discussionmentioning

confidence: 99%

Climate-tree-growth relationships ofQuercus petraeaMill. stand in the Forest of Bercé (“Futaie des Clos”, Sarthe, France)

Lebourgeois¹,

2004

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-The past history of a 300-year-old Quercus petraea stand (the "Futaie des Clos", 8 ha) located 20 km from the town of Le Mans in the Forest of Bercé in the western part of France (Sarthe) was analysed by a dendroecological approach. According to the number of healthy trees alive (> 400), the stand age (> 300 years), and the dimensions of the trees (dia: 92 cm; height: 45.2 m), this plot constitutes one of the most remarkable oak grove in France. High competition pressure between trees appeared to be the most important factor to explain the high-quality timber (high straight stems without wood defaults, narrow regular rings). After an initial 90-year period of decrease, this stand shows a 1 mm·year -1 growth increment from the 1810s to the present. The growth increase of 40-50% occurring for over than 20 years can be interpreted as a response to the increase of harvesting intensity. The influence of climate was evaluated by comparing earlywood, latewood and total ring indices with monthly climatic data collected at Le Mans over the period . Extreme growth years coincided with wet or dry springs (May-June) (± 40% of rainfall in relation to normal conditions) often associated with warm or fresh July. The climatic models accounted for between 18 and 26% of the variability of ring widths, and suggested that earlywood formation depended mainly on previous autumn hydric balance and winter temperature whereas the growth of the latewood band was maximum in early spring (positive effect of May hydric balance). The ecophysiological interpretations of the climatic correlations are discussed. dendroclimatology / tree ring / radial growth / climate / response function / Quercus petraea / long term chronology / pointer years Résumé -Dendroclimatologie du chêne sessile (Quercus petraea Mill.) en forêt de Bercé ("Futais des Clos", Sarthe, France). Une étude dendroécologique a été entreprise afin d'analyser l'évolution de la croissance radiale d'un peuplement âgé de chêne sessile (Quercus petraea Mill.) (la Futaie des Clos) localisé dans la forêt de Bercé à 20 km du Mans (Sarthe -France). En raison du nombre d'arbres présents (plus de 400 sur les 8 ha), de leur âge (> 300 ans en 2001) et de leur dimension (diamètre et hauteur moyens : 92 cm et 45,2 m), ce peuplement constitue une des plus remarquables chênaie sessiliflore de France. La sylviculture peu intensive pratiquée dans le peuplement explique en grande partie la très grande qualité des arbres (tronc très droit sans défaut, cernes fins réguliers). Après une période de décroissance de 90 ans, la largeur moyenne des cernes est d'environ 1 mm par an depuis 1810. L'augmentation de croissance observée depuis une vingtaine d'années peut être interprétée comme l'expression de l'augmentation de l'intensité des éclaircies (diminution de la compétition entre les arbres). L'effet du climat a été analysé en comparant les variations du bois initial, du bois final et du cerne complet aux données climatiques du Mans sur la période 1921-2001. Les années de croissance extrêmes (a...

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“…Mörling [22] found neither an effect of fertilisation nor of thining on ring density of Scots pine in Sweden. Hence this method combines the discussion about juvenile wood with the discussion about modelling of wood density [8,15,39]. Whereby mixed effect-model are wide spreaded in wood science, until now nonlinear mixed effects models are only used in wood science for modelling of branchiness [20,21,35].…”

Section: Introductionmentioning

confidence: 99%

Modelling juvenile-mature wood transition in Scots pine (Pinus sylvestris L.) using nonlinear mixed-effects models

et al. 2004

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-Nonlinear mixed-effects-models are applied successfully to estimate the cambial age of juvenile-mature wood transition in Scots pine sample trees from slow-grown stands. Till now segmented regression models are applied separately for each pith-to-bark-profile of wood density. The nonlinear mixed-effects-model overcomes this limitation while consistently and efficiently estimating the transition point for the whole sample. Furthermore standard errors can be calculated and impacts of stand and tree variables on the shape of pith-to-bark-curves can be tested. Mean ring density, earlywood, and latewood density profiles from 99 trees were determined by X-ray densitometric analysis of disks taken at 4-m stem height. The cambial age of transition from juvenile to mature wood is described according to nonlinear mixed-effects-models based on latewood density profiles. The time-series nature of the data are taken into account. The segmented quadratic-linear model shows the transition at cambial age of 21.77, which vary with the probability of 0.95 within the interval of [18.31; 26.85]. Impacts of tree variables or stands on the location of the transition point were not found, but impacts of stands on the shape of pith-to-bark-curves.Pinus silvestris / microdensitometry / nonlinear mixed effects model / pith-to-bark wood density profile / juvenile-adult transition point Résumé -Modélisation du passage bois juvénile-bois adulte chez le pin sylvestre (Pinus sylvestris L.) à l'aide de modèles mixtes non linéaires. Des modèles mixtes non linéaires ont été utilisés avec succès afin d'estimer l'âge (compté depuis la moelle) du passage bois juvénile-bois adulte pour des pins sylvestres provenant de peuplements à croissance lente. Jusqu'à présent, des modèles de régression segmentés étaient ajustés individuellement à chaque profil de densité du bois de la moelle à l'écorce. Le modèle mixte non linéaire permet de dépasser cette limitation en estimant de manière efficace et cohérente l'âge du point de passage pour l'ensemble de la population échantillonnée. En outre, des variances peuvent être estimées et les impacts des peuplements et des caractéristiques des arbres sur la forme des profils de densité du bois de la moelle à l'écorce peuvent être testés. À cette fin, les profils de densité moyenne de cerne, de densité du bois initial et de densité du bois final de 99 arbres ont été mesurés par exploration microdensitométrique de clichés radiographiques obtenus à partir d'échantillons prélevés dans des disques découpés à 4 mètres de hauteur. L'âge compté depuis la moelle du passage bois juvénile-bois adulte a été identifié à partir de modèles mixtes non linéaires appliqués aux profils de densité du bois final. La nature longitudinale des données a été prise en compte. Le modèle segmenté linéaire quadratique retenu permet d'identifier un âge moyen de passage du bois juvénile au bois adulte de 21,77 ans assorti d'un intervalle de confiance à 5 % de 18,31 à 26,85 ans. Si les impacts des variables "caractéristiques des arbres" ...

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Prévision de la variabilité intra- et interarbre de la densité du bois de chêne rouvre (Quercus petraea Liebl) par modélisation des largeurs et des densités des bois initial et final en fonction de l'âge cambial, de la largeur de cerne et du niveau dans l'arbre

Cited by 21 publications

References 0 publications

Age trends and within-site effects in wood density and radial growth in Quercus faginea mature trees

Age trends and within-site effects in wood density and radial growth in Quercus faginea mature trees

Climate-tree-growth relationships ofQuercus petraeaMill. stand in the Forest of Bercé (“Futaie des Clos”, Sarthe, France)

Modelling juvenile-mature wood transition in Scots pine (Pinus sylvestris L.) using nonlinear mixed-effects models

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