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Differences in xylogenesis between dominant and suppressed trees

Liu Shushan, Li Xiaoxia, Rossi Sergio, Wang Lily, Liu Wei, Liang Eryuan et Leavitt Steven W.. (2018). Differences in xylogenesis between dominant and suppressed trees. American Journal of Botany, 105, (5), p. 950-956.

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URL officielle: http://dx.doi.org/doi:10.1002/ajb2.1089

Résumé

Premise of The Study Most dendroecological studies focus on dominant trees, but little is known about the growing season of trees belonging to different size classes and their sensitivity to biotic factors. The objective of this study was to compare the dynamics of xylem formation between dominant and suppressed trees of Abies fabri of similar age growing in the Gongga Mountains, southeastern Tibetan Plateau, and to identify the association between xylem growth and climate.

Methods The timing and duration of xylogenesis in histological sections were investigated weekly during the 2013–2015 growing seasons.

Key Results Our investigation found that timing and duration of xylogenesis varied with canopy position and its associated tree size. Xylogenesis started 6–14 days earlier, and ended 5–11 days later in dominant trees than in suppressed trees, resulting in a significantly longer growing season. Dominant trees also exhibited higher temperature sensitivity of tracheid production rate than suppressed trees.

Conclusions The observed differences in xylogenesis among trees suggested that competition affects tree growth by reducing the growing period in suppressed trees. Representative climate–growth relationships should involve trees of all size classes when evaluating the effects of the environment on forest dynamics.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:00029122
Volume:105
Numéro:5
Pages:p. 950-956
Version évaluée par les pairs:Oui
Date:2018
Identifiant unique:10.1002/ajb2.1089
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:Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Départements et modules > Département des sciences fondamentales
Mots-clés:Abies fabri, cambial activity, competition, Pinaceae, secondary growth, Tibetan Plateau
Déposé le:02 juin 2023 14:18
Dernière modification:02 juin 2023 14:18
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