Titre : | Influence of ecological factors and individual effects on radial growth and wood density components for sessile oak (Quercus petraea Liebl.) in Paris Basin and north-eastern France by use of mixed linear models |
Auteurs : | L. Berges ; J. Herve ; A. Franc ; J. Gilbert ; G. Nepveu ; CEMAGREF NOGENT SUR VERNISSON EFNO ; Third workshop on Connection between silviculture and wood quality through modelling approaches and simulation software, La Londes-les-Maures, 5-12 September 1999 (1999; FRA) ; ENGREF NANCY EQUIPE DYNAMIQUE DES SYSTEMES FORESTIERS ; ENGREF PARIS DEPARTEMENT MATHEMATIQUES APPLIQUEES ET INFORMATIQUE ; INRA CHAMPENOUX EQUIPE DE RECHERCHE SUR LA QUALITE DES BOIS |
Type de document : | article/chapitre/communication |
Editeur : | Champenoux : INRA - Equipe de recherches sur la qualité des bois, 1999 |
Format : | p. 205-222 |
Note générale : |
document complet en cote A 1452 Sigle : CEMAGREF Sigle : EFNO Diffusion tous publics |
Langues: | = Anglais |
Mots-clés: | BASSIN PARISIEN ; FRANCE NORD EST ; QUERCUS PETRAEA ; PEUPLEMENT EQUIENNE ; FUTAIE REGULIERE ; FACTEUR ECOLOGIQUE ; CROISSANCE EN DIAMETRE ; BOIS ; DENSITE ; PROPRIETE PHYSIQUE ; PROPRIETE MECANIQUE ; MODELISATION ; MODELE |
Résumé : | Wood formation is influenced by several factors: climatic and soil conditions , silvicultural practises, genetic components, and age of the tree. The biological conditions give the ring characteristics (ring width and density) which are related to timber quality. Tree-to-tree wood quality variability within a plot is said to be wide, especially for oak. Studies have shown that individual genotypes largely explain ring quality variability, whereas site and silviculture have little influence. However, it has not been clearly established if ecological factors have an effect on mean ring density only through their effect on the proportion of latewood, or if they can have an additional effect on wood density characteristics (earlywood and latewood densities). The aim of this paper is to answer to this question using a combined analysis of 3 groups of variables: environmental conditions, radial growth components and intra-ring wood density components of sessile oak (Quercus petraea Liebl.). The sample consists in 297 mature oaks in 99 plots stratified according to 3 ecological gradients (macro-climate, soil water capacity and nutrient richness). The plots are located in north-eastern and central France in several even-aged high oak forests. Ecological factors have an influence on latewood ratio, earlywood and latewood densities. Ecological factors generally do not have similar effects on (i) radial growth or latewood ratio and (ii) wood density. Some practical recommendations for high quality sessile oak production are proposed. Then, a linear mixed-effects model allows to split up wood density variability: ecological factors have the least influence compared to cambial age effect or inter-tree variance. One of the main results is the complexity of the relationships between ring width and density. They depend on the level of observation: a strong correlation between ring width and density is generally observed within a tree, but no significant relationship is noticed when considering plot means. |
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