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Cambial activity related to tree size in a mature silver-fir plantation

Rathgeber Cyrille B. K., Rossi Sergio et Bontemps Jean-Daniel. (2011). Cambial activity related to tree size in a mature silver-fir plantation. Annals of Botany, 108, (3), p. 429-438.

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URL officielle: http://dx.doi.org/doi:10.1093/aob%2Fmcr168

Résumé

Background and Aims: Our knowledge about the influences of environmental factors on tree growth is principally based on the study of dominant trees. However, tree social status may influence intra-annual dynamics of growth, leading to differential responses to environmental conditions. The aim was to determine whether within-stand differences in stem diameters of trees belonging to different crown classes resulted from variations in the length of the growing period or in the rate of cell production.

Methods: Cambial activity was monitored weekly in 2006 for three crown classes in a 40-year-old silver-fir (Abies alba) plantation near Nancy (France). Timings, duration and rate of tracheid production were assessed from anatomical observations of the developing xylem.

Key Results: Cambial activity started earlier, stopped later and lasted longer in dominant trees than in intermediate and suppressed ones. The onset of cambial activity was estimated to have taken 3 weeks to spread to 90% of the trees in the stand, while the cessation needed 6 weeks. Cambial activity was more intense in dominant trees than in intermediate and suppressed ones. It was estimated that about 75% of tree-ring width variability was attributable to the rate of cell production and only 25% to its duration. Moreover, growth duration was correlated to tree height, while growth rate was better correlated to crown area.

Conclusions: These results show that, in a closed conifer forest, stem diameter variations resulted principally from differences in the rate of xylem cell production rather than in its duration. Tree size interacts with environmental factors to control the timings, duration and rate of cambial activity through functional processes involving sourcesink relationships principally, but also hormonal controls.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0305-7364
Volume:108
Numéro:3
Pages:p. 429-438
Version évaluée par les pairs:Oui
Date:2011
Identifiant unique:10.1093/aob/mcr168
Sujets:Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:cambial activity, forest-stand structure, silver fir (Abies alba), social status, tree-ring formation, tree-to-tree competition, wood anatomy, xylem cell differentiation
Déposé le:05 juin 2023 18:48
Dernière modification:05 juin 2023 18:48
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