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A meta-analysis of cambium phenology and growth : linear and non-linear patterns in conifers of the northern hemisphere

Rossi Sergio, Anfodillo Tommaso, Čufar Katarina, Cuny Henri E., Deslauriers Annie, Fonti Patrick, Frank David, Gričar Jožica, Gruber Andreas, King Gregory M., Krause Cornelia, Morin Hubert, Oberhuber Walter, Prislan Peter et Rathgeber Cyrille B. K.. (2013). A meta-analysis of cambium phenology and growth : linear and non-linear patterns in conifers of the northern hemisphere. Annals of Botany, 112, (9), p. 1911-1920.

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Background and Aims Ongoing global warming has been implicated in shifting phenological patterns such as the timing and duration of the growing season across a wide variety of ecosystems. Linear models are routinely used to extrapolate these observed shifts in phenology into the future and to estimate changes in associated ecosystem properties such as net primary productivity.Yet, in nature, linear relationships may be special cases. Biological processes frequently followmore complex, non-linear patterns according to limiting factors that generate shifts and discontinuities, or contain thresholds beyond which responses change abruptly. This study investigates to what extent cambium phenology is associated with xylem growth and differentiation across conifer species of the northern hemisphere.

Methods Xylemcell production is compared with the periods of cambial activityand cell differentiation assessed on aweekly time scale on histological sections of cambium and wood tissue collected from the stems of nine species in Canada and Europe over 1-9 years per site from 1998 to 2011.

Key Results The dynamics of xylogenesis were surprisingly homogeneous among conifer species, although dispersions from the average were obviously observed. Within the range analysed, the relationships between the phenological timings were linear, with several slopes showing values close to or not statistically different from 1. The relationships between the phenological timings and cell production were distinctly non-linear, and involved an exponential pattern.

Conclusions The trees adjust their phenological timings according to linear patterns. Thus, shifts of one phenological phase are associated with synchronous and comparable shifts of the successive phases.However, small increases in the duration of xylogenesis could correspond to a substantial increase in cell production. The findings suggest that the length of the growing season and the resulting amount of growth could respond differently to changes in environmental conditions.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 1911-1920
Version évaluée par les pairs:Oui
Identifiant unique:10.1093/aob/mct243
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:cambium, cell differentiation, cell production, climate change, conifers, growth, meristem, phenology, productivity, secondary wall formation, xylogenesis
Déposé le:26 mai 2023 13:54
Dernière modification:26 mai 2023 13:54
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