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WOOD DENSITY IN SESSILE OAK (Quercus petraea Liebl.) : modelling of the within- and between-tree variability ; origin and non-destructive assessment of the « tree » effect ; interpretation of the developed model with anatomical traits.

Edith Guilley
Abstract : The general objectives of the thesis are : i/ to develop a wood density model for Sessile oak (Quercus petraea Liebl.), which can be linked with diameter and height growth models, ii/ to test the model in contrasted conditions of climate, silviculture and site quality, iii/ to estimate the between-tree variability of wood density (i.e. variation due to the « tree » effect) by the means of non destructive measurements on standing trees and iv/ to investigate the anatomical modifications which produce within- and between-tree variations of wood density. After a literature review in a first chapter of relations linking wood density and some features of internal wood quality for Oak, the second chapter is devoted to the establishment of a wood density model for Sessile oak. The model is designed with data (microdensity at ring level as well as basic density at group of rings level) collected from 82 sessile oaks sampled in five French regions (Alsace, Lorraine, Orne et Sarthe, Allier, Loir-et-Cher). Two silvicultural schedules (coppice with standard and high forest) and three fertility classes were represented in each region. The model was developed using mixed model theory and takes into account the two main sources of variation identified in Sessile oak for wood density : i/ within-tree variations (i.e. variations along the radial and longitudinal axes of the tree) and ii/ between-tree variations. The proposed model is made up of : i/ a determinist part shared by every trees and ii/ a random part which structures the between-tree variations. In the work thesis the between-tree variations due to the so-called " tree
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Submitted on : Monday, July 30, 2007 - 8:00:00 AM
Last modification on : Monday, July 30, 2007 - 8:00:00 AM
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Edith Guilley. WOOD DENSITY IN SESSILE OAK (Quercus petraea Liebl.) : modelling of the within- and between-tree variability ; origin and non-destructive assessment of the « tree » effect ; interpretation of the developed model with anatomical traits.. Life Sciences [q-bio]. ENGREF (AgroParisTech), 2000. English. ⟨NNT : 00ENGR0005⟩. ⟨pastel-00002809⟩

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