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Master thesis

Relationship between anatomical structure and mechanical adaptations of wood formed after thinning in beech (Fagus Sylvatica L.)

Abstract : In the present study, we investigated the reaction of small diameter but old beech poles to canopy opening with particular interest in occurrence of growth stresses which allows the tree to maintain or correct its spatial position. We studied the relationships between growth stresses and (i) tree morphology, (ii) thinning treatment and (iii) anatomical structure. Forty-two beech poles were used for the study, half of which were thinned in 2007. We measured the tree morphological characteristics; growth stresses indicators (GSI) at eight positions around the trunk periphery and wood anatomical characteristics including proportion of G fibers and vessel characteristics. Among the tree morphological descriptors, only crown eccentricity showed a slight correlation with the growth stress asymmetry i.e. the intensity of tension wood. Diameter and slenderness (height to diameter ratio) did not exhibit any relationship with the growth stress average value and asymmetry in beech poles. It seems therefore difficult to anticipate the beech pole growth stress level from its diameter and slenderness. Surprisingly, thinning treatment did not affect the average growth stress level and asymmetry in old beech poles. This unexpected result may be related to the high age of these trees and short time scale observation. Considering the relationship between the proportions of G fiber and the level of growth stresses, a significant positive correlation was found in agreement with previous studies on other species. Further, a negative correlation was found between vessel surface area and GSI level. Vessel frequency was also decreased with the increasing GSI level and proportion of G fibers.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2014_PURBA_CITRA.pdf
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https://hal.univ-lorraine.fr/hal-01838010
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Citra Purba. Relationship between anatomical structure and mechanical adaptations of wood formed after thinning in beech (Fagus Sylvatica L.). Sciences de l'environnement. 2014. ⟨hal-01838010⟩

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