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Xylogenesis in black spruce : does soil temperature matter?

Lupi Carlo, Morin Hubert, Deslauriers Annie et Rossi Sergio. (2012). Xylogenesis in black spruce : does soil temperature matter? Tree Physiology, 32, (1), p. 74-82.

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In boreal ecosystems, an increase in soil temperature can stimulate plant growth. However, cambium phenology in trees was better explained by air than soil temperature, which suggested that soil temperature is not the main limiting factor affecting xylogenesis. Since soil temperature and snowmelt are correlated to air temperature, the question whether soil temperature directly limits xylogenesis in the stem will remain unresolved without experiments disentangling air and soil temperatures. This study investigated the effects of an increase of 4 °C in soil temperature and a consequent 1-week earlier snowmelt on growth of black spruce [Picea mariana (Mill.) BSP] in the boreal forest of Quebec, Canada. The soil of two natural stands at different altitudes was warmed up with heating cables during 2008-2010 and cambial phenology and xylem production were monitored weekly from April to October. The results showed no significant effect of the treatment on the phenological phases of cell enlargement and wall thickening and lignification. The number of cells produced in the xylem also did not differ between control and heated trees. These findings allowed the hypothesis of a direct influence of soil temperature on stem growth to be rejected and supported the evidence that, in the short term, air temperature is the main limiting factor for xylogenesis in trees of these environments.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 74-82
Version évaluée par les pairs:Oui
Identifiant unique:10.1093/treephys/tpr132
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
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:boreal forest, cambium, climate change, intra-annual growth, microcores, soil temperature, soil warming, wood production, xylem phenology
Déposé le:26 mai 2023 14:00
Dernière modification:26 mai 2023 14:00
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