Effect of growth conditions on wood density of Spanish Pinus nigra |
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Authors: | A Gutiérrez Oliva V Baonza Merino J I Fernández-Golfín Seco M Conde García E Hermoso Prieto |
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Institution: | (1) Forest Products Department, INIA, P.O. Box 8111, 28080 Madrid, Spain |
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Abstract: | The natural forests of Laricio Pine (Pinus nigra Subsp. salzmannii) cover in Spain an area of 353,000 ha, producing annually 310,000 m3 of roundwood. This species is considered as the fourth, most important Spanish conifer, being its timber frequently used
in construction. The natural area of distribution of Laricio pine in Spain is officially divided into ten different regions
of provenance, being only four of them considered as productive. The present study on the influence of growth conditions on
extracted wood basic density (EBD) is carried out on 89 P. nigra trees, sampled from the two most productive Spanish regions of provenance (R.7 and R.8) in seven different sites. Cross-sectional
disks were cut at 3 m (in 89 trees) and every 3 m height (in 18 trees) from the butt up to 15 m. For assessing the pattern
of radial variation of the properties, 20×20×20 mm3 wood samples were taken radially from every cross-sectional disk. In every 20×20×20 mm3 wood sample, age and distance to the pith of the central annual ring was recorded, together with the average growth rate.
Extractive content and EBD were measured in every sample. The results lead to the conclusion that there is not a significant
relationship between EBD and provenance or growth rate. On the contrary, a significant relationship has been found between
EBD and site quality or cambial age. The results also demonstrate that in a tree EBD tends to diminish from the base to the
top and from the pith outwards. The main result of the present study is related with the observation that for the same cambial
age, annual ring width has no significant influence on EBD, confirming that its utility as a predictor of the quality of timber
is highly questionable, at least if the ring curvature is not considered. |
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Keywords: | Annual ring Basic density Cambial age Extractives Pinus nigra Site quality Stem height |
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