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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.

holzforschung

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