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Increasing nitrogen availability and soil temperature : effects on xylem phenology and anatomy of mature black spruce

Lupi Carlo, Morin Hubert, Deslauriers Annie, Rossi Sergio et Houle Daniel. (2012). Increasing nitrogen availability and soil temperature : effects on xylem phenology and anatomy of mature black spruce. Canadian Journal of Forest Research, 42, (7), p. 1277-1288.

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Since plant growth in the boreal forest is often considered to be limited by low temperatures and low N availability and these variables are projected to increase due to climate warming and increased anthropogenic activities, it is important to understand whether and to what extent these disturbances may affect the growth of boreal trees. In this study, the hypotheses that wood phenology and anatomy were affected by increased soil temperatures and N depositions have been tested in two mature black spruce (Picea mariana (Mill.) BSP) stands at different altitudes in Quebec, Canada. For 3 years, soil temperature was increased by 4 °C during the first part of the growing season and precipitations containing three times the current N concentration were added in the field by frequent canopy applications. Soil warming resulted in earlier onsets of xylogenesis and interacted with N addition producing longer durations of xylogenesis for the treated trees. The effect of warming was especially marked in the phenology of roots, while wood production, in terms of number of tracheids, was not affected by the treatment. Xylem anatomy and soil and needle chemistry showed no effect of the treatments, except for an increase of cell wall thickness in early wood of treated trees. This short-term experiment with black spruce suggested that previous fertilization studies that used large and unrealistic rates of N addition may have overestimated the impact of N depositions on boreal forest productivity.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 1277-1288
Version évaluée par les pairs:Oui
Identifiant unique:10.1139/X2012-055
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:Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Départements et modules > Département des sciences fondamentales
Mots-clés:anatomy, atmospheric deposition, boreal forest, coniferous tree, developmental biology, forestry production, global warming, growing season, human activity, nitrogen, nutrient availability, phenology, precipitation (climatology), soil temperature, xylem
Informations complémentaires:This article is one of a selection of papers from the 7th International Conference on Disturbance Dynamics in Boreal Forests.
Déposé le:26 mai 2023 13:58
Dernière modification:26 mai 2023 13:58
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