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Temperate and boreal forest tree phenology: from organ-scale processes to terrestrial ecosystem models

Nicolas Delpierre, Yann Vitasse, Isabelle Chuine, Guillemot Joannès, Stephane Bazot, This Ruthishauser & Cyrille B,K. Rathgeber

Résumé -Key message We demonstrate that, beyond leaf phenol- ogy, the phenological cycles of wood and fine roots present clear responses to environmental drivers in temperate and boreal trees. These drivers should be included in terrestri- al ecosystem models.
-Context In temperate and boreal trees, a dormancy period prevents organ development during adverse climatic condi- tions. Whereas the phenology of leaves and flowers has re- ceived considerable attention, to date, little is known regard- ing the phenology of other tree organs such as wood, fine roots, fruits, and reserve compounds.
-Aims Here, we review both the role of environmental drivers in determining the phenology of tree organs and the models used to predict the phenology of tree organs in tem- perate and boreal forest trees.
-Results Temperature is a key driver of the resumption of tree activity in spring, although its specific effects vary among organs. There is no such clear dominant environmental cue involved in the cessation of tree activity in autumn and in the onset of dor- mancy, but temperature, photoperiod, and water stress appear as prominent factors. The phenology of a given organ is, to a certain extent, influenced by processes in distant organs.
-Conclusion Inferring past trends and predicting future trends of tree phenology in a changing climate requires spe- cific phenological models developed for each organ to consid- er the phenological cycle as an ensemble in which the envi- ronmental cues that trigger each phase are also indirectly in- volved in the subsequent phases. Incorporating such models into terrestrial ecosystem models (TEMs) would likely im- prove the accuracy of their predictions. The extent to which the coordination of the phenologies of tree organs will be affected in a changing climate deserves further research.
   
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Citation Delpierre, N., Vitasse, Y., Chuine, I., Joannès, G., Bazot, S., Ruthishauser, T., & Rathgeber, C. B. (2016). Temperate and boreal forest tree phenology: from organ-scale processes to terrestrial ecosystem models. Annals of forest Science, 73, 5-25.
   
Type Article de périodique (Anglais)
Date de publication 1-1-2016
Nom du périodique Annals of forest Science
Volume 73
Pages 5-25