LiveZilla Live Chat Software

Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Using simple causal modeling to understand how water and temperature affect daily stem radial variation in trees

Deslauriers Annie, Anfodillo Tommaso, Rossi Sergio et Carraro Vinicio. (2007). Using simple causal modeling to understand how water and temperature affect daily stem radial variation in trees. Tree Physiology, 27, (8), p. 1125-1136.

[img]
Prévisualisation
PDF - Version acceptée
634kB

URL officielle: http://dx.doi.org/doi:10.1093/treephys/27.8.1125

Résumé

Variation in tree stem diameter results from reversible shrinking and swelling and irreversible radial growth, all processes that are influenced by tree water status. To assess the causal effects of water and temperature on stem radial variation (ΔR) and maximum daily shrinkage (MDS), the diurnal cycle was divided into three phases: contraction, expansion and stem radius increment. Diurnal cycles were measured during 1996-2004 in Picea abies (L.) Karst., Pinus cembra L. and Larix decidua Mill. in a timberline ecotone to understand the links between stem diameter variation (v; defined as MDS or ΔR), phase duration (h), and weather or sap flow descriptors (d). We demonstrated that a high proportion of MDS and ΔR was explained by h because of the nonlinearity of the physiological responses to weather d. By causal modeling, we tested whether the relationship between d and v was due to h (lack of causal relationship between d and v) or to both d and h (double cause). The results of this modeling added new physiological insight into daily growth-climate relationships. Negative correlations were found between ΔR and air temperature owing to the negative effect of temperature on h only, and did not correspond to a direct effect on tree growth mediated by an alteration in metabolic activities. Precipitation had two main effects: a direct effect on ΔR and an indirect effect mediated through an effect on h. A reduction in sap flow at night led to an increase in ΔR for P. abies and L. decidua, but not for P. cembra.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0829318X (ISSN)
Volume:27
Numéro:8
Pages:p. 1125-1136
Version évaluée par les pairs:Oui
Date:2007
Sujets: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
Mots-clés:conifers, growth-climate relationships, radial growth, stem contraction, tree-water relations
Informations complémentaires:This is a pre-copyedited, author-produced version of an article accepted for publication in Tree Physiology following peer review. The version of record Deslauriers A, Anfodillo T, Rossi S et Carraro V. 2007. Using simple causal modeling to understand how water and temperature affect daily stem radial variation in trees. Tree Physiology, 27 : 1125-1136 is available online at: http://dx.doi.org/doi:10.1093/treephys/27.8.1125
Déposé le:19 janv. 2017 01:29
Dernière modification:19 janv. 2017 01:29
Afficher les statistiques de telechargements

Éditer le document (administrateurs uniquement)

Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

Bibliothèque Paul-Émile-Boulet, UQAC
555, boulevard de l'Université
Chicoutimi (Québec)  CANADA G7H 2B1
418 545-5011, poste 5630