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Lengthening height-growth duration in Smith fir as onset becomes more synchronous across elevations under climate warming scenarios

Zhang Jingtian, Li Xiaoxia, Ren Ping, Chai Chenhao, Camarero J. Julio, Leavitt Steven W., Rossi Sergio et Liang Eryuan. (2022). Lengthening height-growth duration in Smith fir as onset becomes more synchronous across elevations under climate warming scenarios. Agricultural and Forest Meteorology, 326, (e109193),

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URL officielle: http://dx.doi.org/doi:10.1016/j.agrformet.2022.109...

Résumé

Accurate projections of growing-season duration of trees are crucial in evaluating the capacity of forests to mitigate climate warming through growth and CO2 uptake. However, little is known on how and to what extent the growing season of tree height growth will change under future warming. Herein, we projected the height-growth phenology of Smith fir (Abies georgei var. smithii) along two altitudinal gradients on the southeastern Tibetan Plateau under CMIP6 climate scenarios by using process-based phenology models. The models performed well when simulating timings of height-growth onset and cessation on the plot level, with root mean square errors of less than 5.8 and 3.8 days, respectively. From the 2020s to 2090s, the onset of height growth (i.e. bud swelling date) was predicted to advance by 10 ± 6 days under four warming scenarios. The elevational gradients of onset of bud swelling would significantly decrease from 3–4 to 1–2 days 100m−1 under the warmest climate scenario, suggesting future warming may result in more uniform onset of height growth along elevational gradients. Given the temporal variation of thermal requirements, the projected cessation of height growth was delayed by 3 ± 1 days in most plots. Overall, the height-growth duration was predicted to lengthen by 4–22 days by the end of the century. The extended duration of height growth predicted for Smith fir could enhance primary growth, forest productivity, and CO2 sequestration on the southeastern Tibetan Plateau.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:01681923
Volume:326
Numéro:e109193
Version évaluée par les pairs:Oui
Date:15 Novembre 2022
Identifiant unique:10.1016/j.agrformet.2022.109193
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Départements et modules > Département des sciences fondamentales
Mots-clés:climate change, tree phenology, height growth, process-based phenology model, growing season length
Déposé le:01 juin 2023 12:41
Dernière modification:05 juin 2023 15:30
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