Assessment of continuous distribution of wood properties from a low number of samples : Application to the variability of modulus of elasticity between trees and within a tree
The aim of this study was to propose an alternative non-deterministic and non-parametric technique for describing continuous variation in modulus of elasticity (E) within and between stems. The material studied consisted of hybrid Eucalyptus (Eucalyptus urophylla×Eucalyptus grandis) stems felled at the age of 59 months. Samples for measuring E were taken along a diameter slab at 1.30 m above ground. The results showed that the proposed reconstruction technique is consistent compared to results from other studies on Eucalyptus. E increases from pith to bark, following a polynomial distribution. Local and tree-averaged E increased with cambial age, following a sigmoidal profile that can be described with five characteristic parameters (E at pith, E at inflection point, E after inflection point, cambial age when latency period ends, and cambial age at inflection point). The tree contributes little to the total variation. The most important changes in E value were found with increasing radial position, with this effect eight-fold more important than the tree effect.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | K50 - Technologie des produits forestiers, U10 - Informatique, mathématiques et statistiques, Eucalyptus, Élasticité, bois, mesure (activité), méthode, modèle mathématique, propriété technologique, métrologie, http://aims.fao.org/aos/agrovoc/c_2683, http://aims.fao.org/aos/agrovoc/c_26777, http://aims.fao.org/aos/agrovoc/c_8421, http://aims.fao.org/aos/agrovoc/c_4668, http://aims.fao.org/aos/agrovoc/c_4788, http://aims.fao.org/aos/agrovoc/c_24199, http://aims.fao.org/aos/agrovoc/c_2572, http://aims.fao.org/aos/agrovoc/c_6a3cd403, |
| Online Access: | http://agritrop.cirad.fr/545297/ http://agritrop.cirad.fr/545297/1/545297.pdf |
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| Summary: | The aim of this study was to propose an alternative non-deterministic and non-parametric technique for describing continuous variation in modulus of elasticity (E) within and between stems. The material studied consisted of hybrid Eucalyptus (Eucalyptus urophylla×Eucalyptus grandis) stems felled at the age of 59 months. Samples for measuring E were taken along a diameter slab at 1.30 m above ground. The results showed that the proposed reconstruction technique is consistent compared to results from other studies on Eucalyptus. E increases from pith to bark, following a polynomial distribution. Local and tree-averaged E increased with cambial age, following a sigmoidal profile that can be described with five characteristic parameters (E at pith, E at inflection point, E after inflection point, cambial age when latency period ends, and cambial age at inflection point). The tree contributes little to the total variation. The most important changes in E value were found with increasing radial position, with this effect eight-fold more important than the tree effect. |
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