Radial growth and wood density are important traits in assessing wood quality. Our objective was to investigate patterns of variation of radial growth (ring width, earlywood width, latewood width, latewood proportion) and wood density (ring average density, earlywood density, latewood density) components in a 30-year-old Pinus brutia at two test sites in Turkey. Wood increment cores at a height of 1.30 cm (dbh) from 1,010 trees at age 30 years were evaluated at two test sites. The radial growth and wood density traits of the individual rings were measured using X-ray densitometry. The test sites showed statistically significant differences in the radial growth traits but not in the wood density traits, suggesting that the wood density traits are less subject to environmental changes. The ring average density was relatively low (485 kg/m 3 ) at early cambial ages (near the pith) and increased to 501 kg/m 3 at later cambial ages (near the bark). The latewood density was 550 kg/m 3 near the pith, increased steadily to 630 kg/m 3 at cambial age 12, and remained stable thereafter. In contrast, the earlywood density and latewood proportion were highest near the pith. The twelfth ring from the pith appeared to represent the transition from juvenile to mature wood. The unique relationships among early and latewood densities and latewood proportion in the juvenile and mature wood contribute to more uniform wood both within a given annual ring and between the juvenile and mature portions of the stem in P. brutia. Thinning increased the ring width, latewood proportion, and ring average density. Trees (2012) 26:975-986 977 EWD, LWD, and LWP in the juvenile and mature wood J M J M J M J M J M J M 0 1 2 3 4 5
-The purpose of this study was to determine the effects of plantation thinning on various wood properties of Pinus brutia Ten. Tree samples were obtained from heavily and moderately thinned and unthinned 33−35 year-old plantations. Wood properties were examined in various wood zones including 16 annual rings after the first treatment. The results of this study showed that there was a significant relationship between thinning intensity and radial increment (1.30 m) for an individual tree. Thinning treatments increased annual ring width especially a few years after thinning. Heavy thinning treatments were especially effective in impacting mean ring width values at breast height. However, the percentage of late wood did not differ much between the samples. Based on the results of correlation analysis between ring width and late wood percentage there was no significant correlation identified. Mean wood density was not affected by the treatments. Also, no significant correlation was found between thinning and examined strength properties (MOR, MOE and compression strength parallel to grain). However, a relationship was found between wood density and all strength properties except for MOE. The current results suggest that thinning can produce improvements in ring width without any negative impacts on investigated wood properties. It is recommended that subsequent studies should be designed to understand genetic effects and maximize treatment effects.Pinus brutia Ten. / thinning / wood properties Résumé -Effets de l'intensité des éclaircies sur la densité, les modules d'élasticité et de rupture et de rupture transversale du bois de Pinus brutia Ten. L'objectif de cette étude était de déterminer l'effet d'une éclaircie sur quelques propriétés du bois de Pinus brutia Ten. de plantations. Les arbres proviennent de plantations âgées de 33−35 années, fortement, modérément ou non éclaircies. Les propriétés du bois ont été examinées dans une zone incluant 16 cernes annuels après le premier traitement. Les résultats de cette étude montrent qu'il existe une relation positive significative entre l'intensité de l'éclaircie et l'incrément radial (1.30 m) de bois pour un arbre individuel. Les traitements d'éclaircie ont augmenté la largeur des cernes particulièrement dans les années ayant suivi l'éclaircie, et il y avait un net effet des traitements d'éclaircie notamment des fortes éclaircies, sur la largeur de cerne moyenne à hauteur de poitrine. Toutefois le pourcentage de bois final variait peu. L'analyse de corrélation entre largeur de cerne et le pourcentage de bois final n'a pas montré de relation significative. La densité moyenne du bois n'était pas affectée par les traitements. Dans cette étude, aucune corrélation significative n'a été observée entre l'éclaircie et les propriétés mécaniques étudiées (résistance en flexion, rigidité en flexion, et résistance en compression dans le sens du fil). Une relation linéaire positive a été obtenue entre la densité du bois et les propriétés de résistance mais pas avec la rigi...
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