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Upscaling xylem phenology : sample size matters

Silvestro Roberto, Sylvain Jean-Daniel, Drolet Guillaume, Butto Valentina, Auger Isabelle, Mencuccini Maurizio et Rossi Sergio. (2022). Upscaling xylem phenology : sample size matters. Annals of Botany, 130, (6), p. 811-824.

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URL officielle: http://dx.doi.org/doi:10.1093/aob%2Fmcac110

Résumé

Background and Aims : Upscaling carbon allocation requires knowledge of the variability at the scales at which data are collected and applied. Trees exhibit different growth rates and timings of wood formation. However, the factors explaining these differences remain undetermined, making samplings and estimations of the growth dynamics a complicated task, habitually based on technical rather than statistical reasons. This study explored the variability in xylem phenology among 159 balsam firs [Abies balsamea (L.) Mill.].

Methods : Wood microcores were collected weekly from April to October 2018 in a natural stand in Quebec, Canada, to detect cambial activity and wood formation timings. We tested spatial autocorrelation, tree size and cell production rates as explanatory variables of xylem phenology. We assessed sample size and margin of error for wood phenology assessment at different confidence levels.

Key Results : Xylem formation lasted between 40 and 110 d, producing between 12 and 93 cells. No effect of spatial proximity or size of individuals was detected on the timings of xylem phenology. Trees with larger cell production rates showed a longer growing season, starting xylem differentiation earlier and ending later. A sample size of 23 trees produced estimates of xylem phenology at a confidence level of 95 % with a margin of error of 1 week.

Conclusions : This study highlighted the high variability in the timings of wood formation among trees within an area of 1 km2. The correlation between the number of new xylem cells and the growing season length suggests a close connection between the processes of wood formation and carbon sequestration. However, the causes of the observed differences in xylem phenology remain partially unresolved. We point out the need to carefully consider sample size when assessing xylem phenology to explore the reasons underlying this variability and to allow reliable upscaling of carbon allocation in forests.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0305-7364
Volume:130
Numéro:6
Pages:p. 811-824
Version évaluée par les pairs:Oui
Date:2022
Identifiant unique:10.1093/aob/mcac110
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
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:boreal forest, carbon allocation, cell production, Abies balsamea, tree growth, tree size, wood formation, xylem development, xylem differentiation, xylogenesis
Déposé le:01 juin 2023 15:02
Dernière modification:01 juin 2023 15:02
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