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Duration of xylogenesis in black spruce lengthened between 1950 and 2010

Boulouf-Lugo Jacqueline Rosario, Deslauriers Annie et Rossi Sergio. (2012). Duration of xylogenesis in black spruce lengthened between 1950 and 2010. Annals of Botany, 110, (6), p. 1099-1108.

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URL officielle: http://dx.doi.org/doi:10.1093/aob/mcs175

Résumé

Background and Aims Reconstructions have identified the 20th century as being uniquely warm in the last 1000 years. Changes in the phenology of primary meristems converged toward increases in length of the growing season. Has the phenology of secondary meristem changed during the last century, and to what extent?

Methods Timings of wood formation in black spruce, Picea mariana, were monitored for 9 years on a weekly timescale at four sites in the boreal forest of Quebec, Canada. Models for assessing xylem phenology were defined and applied to reconstruct onset, ending and duration of xylogenesis between 1950 and 2010 using thermal thresholds on chronologies of maximum and minimum temperatures.

Key Results All sites exhibited increasing trends of both annual and May–September temperatures, with the greatest changes observed at the higher latitudes. Phenological events in spring were more affected than those occurring in autumn, with cambial resumptions occurring 0·5–0·8 d decade−1 earlier. The duration of xylogenesis has lengthened significantly since 1950, although the models supplied wide ranges of variations, between 0·07 and 1·5 d decade−1, respectively.

Conclusions The estimated changes in past cambial phenology demonstrated the marked effects of the recent increase in temperature on the phenological traits of secondary meristems. In the long run, the advancement of cambial activity could modify the short time window for growth of boreal species and dramatically affect the dynamics and productivity of trees in these temperature-limited ecosystems.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0305-7364
Volume:110
Numéro:6
Pages:p. 1099-1108
Version évaluée par les pairs:Oui
Date:2012
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
Mots-clés:Boreal forest, cell differentiation, Picea mariana, threshold temperature, wood formation, xylogenesis
Informations complémentaires:This is a pre-copyedited, author-produced PDF of an article accepted for publication in Annals of Botany following peer review. The version of record "Boulouf-Lugo J, Deslauriers A et Rossi S. 2012. Duration of xylogenesis in black spruce lengthened between 1950 and 2010. Annals of Botany, 110 : 1099-1108" is available online at: http://dx.doi.org/doi:10.1093/aob/mcs175
Déposé le:08 juin 2016 15:29
Dernière modification:05 déc. 2016 20:33
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