Li X. N., Liang Eryuan, Gričar Jožica, Prislan Peter, Rossi Sergio et Čufar Katarina. (2013). Age dependence of xylogenesis and its climatic sensitivity in Smith fir on the south-eastern Tibetan Plateau. Tree Physiology, 33, (1), p. 48-56.
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URL officielle: http://dx.doi.org/doi:10.1093/treephys%2Ftps113
Résumé
An age effect on growth trends and climate/growth relationships of trees can possibly be discovered by analysing the seasonal dynamics of xylem development. The aims of this study, therefore, were to compare xylem formation of young (43 ± 4 years) and old (162 ± 26 years) Smith fir (Abies georgei var. smithii (Viguie & Gaussen) W. C. Cheng & L. K. Fu) trees in the Sygera Mountains, south-eastern Tibetan Plateau and, to identify the association between wood formation and climate. The seasonal radial growth dynamics of young and old trees was monitored on microcores collected at weekly intervals during two growing seasons. Transverse sections through phloem, cambium and outermost xylem of 9-12 μm thickness were observed with a light microscope under bright field and polarized light to follow the cambial activity and differentiation of the developing xylem. Young trees were characterized by an earlier onset of xylogenesis, a longer growing season and a higher growth rate, resulting in a higher number of xylem cells. Both young and old trees responded fast to changes of the minimum air temperature, confirming that this factor was dominant by controlling Smith fir growth on the south-eastern Tibetan Plateau.
Type de document: | Article publié dans une revue avec comité d'évaluation |
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ISSN: | 0829-318X |
Volume: | 33 |
Numéro: | 1 |
Pages: | p. 48-56 |
Version évaluée par les pairs: | Oui |
Date: | 2013 |
Identifiant unique: | 10.1093/treephys/tps113 |
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: | Abies georgei var. smithii, age dependence, dendroclimatology, minimum temperature, south-eastern Tibetan plateau, tree ring, weekly wood formation, xylogenesis |
Déposé le: | 07 juin 2023 17:05 |
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Dernière modification: | 07 juin 2023 17:05 |
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