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Pré-Publication, Document De Travail Année : 2023

Phenology across scales: an intercontinental analysis of leaf-out dates in temperate deciduous tree communities

Nicolas Delpierre
Koen Hufkens
Colin Beier
  • Fonction : Auteur
Michael Bell
  • Fonction : Auteur
Matthias Cuntz
Giulio Curioni
Kyla Dahlin
Sander O Denham
Ankur R Desai
Jean-Christophe Domec
Kris M Hart
  • Fonction : Auteur
Andreas Ibrom
Emilie Joetzjer
  • Fonction : Auteur
John King
Anne Klosterhalfen
Franziska Koebsch
  • Fonction : Auteur
Peter Mc Hale
  • Fonction : Auteur
J. William Munger
Asko Noormets
Kim Pilegaard
Felix Pohl
Corinna Rebmann
Andrew D Richardson
  • Fonction : Auteur
David Rothstein
  • Fonction : Auteur
Mark D Schwartz
Matthew Wilkinson
  • Fonction : Auteur
Kamel Soudani

Résumé

Abstract Aim To quantify the intra-community variability of leaf-out (ICVLo) among dominant trees in temperate deciduous forests, assess its links with specific and phylogenetic diversity, identify its environmental drivers, and deduce its ecological consequences with regard to radiation received and exposure to late frost. Location Eastern North America (ENA) and Europe (EUR). Time period 2009-2022 Major taxa studied Temperate deciduous forest trees. Methods We developed an approach to quantify ICVLo through the analysis of RGB images taken from phenological cameras. We related ICVLo to species richness, phylogenetic diversity and environmental conditions. We quantified the intra-community variability of the amount of radiation received and of exposure to late frost. Results Leaf-out occurred over a longer time interval in ENA than in EUR. The sensitivity of leaf-out to temperature was identical in both regions (-3.4 days per °C). The distributions of ICVLo were similar in EUR and ENA forests, despite the latter being more species-rich and phylogenetically diverse. In both regions, cooler conditions and an earlier occurrence of leaf-out resulted in higher ICVLo. ICVLo resulted in a ca. 8% difference of radiation absorption over spring among individual trees. Forest communities in ENA had shorter safety margins as regards the exposure to late frosts, and were actually more frequently exposed to late frosts. Main conclusions We conducted the first intercontinental analysis of the variability of leaf-out at the scale of tree communities. North American and European forests showed similar ICVLo, in spite of their differences in terms of species richness and phylogenetic diversity, highlighting the relevance of environmental controls on ICVLo. We quantified two ecological implications of ICVLo (difference in terms of radiation absorption and exposure to late frost), which should be explored in the context of ongoing climate change, which affects trees differently according to their phenological niche.
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hal-04409675 , version 1 (22-01-2024)

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Nicolas Delpierre, Suzon Garnier, Hugo Treuil-Dussouet, Koen Hufkens, Jianhong Lin, et al.. Phenology across scales: an intercontinental analysis of leaf-out dates in temperate deciduous tree communities. 2023. ⟨hal-04409675⟩
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