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Frost controls spring phenology of juvenile Smith fir along elevational gradients on the southeastern Tibetan Plateau

Wang Yafeng, Case Bradley, Rossi Sergio, Dawadi Binod, Liang Eryuan et Ellison Aaron M.. (2019). Frost controls spring phenology of juvenile Smith fir along elevational gradients on the southeastern Tibetan Plateau. International Journal of Biometeorology, 63, (7), p. 963-972.

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URL officielle: http://dx.doi.org/doi:10.1007/s00484-019-01710-4

Résumé

Impacts of climatic means on spring phenology are well documented, whereas the role of climatic variance, such as occurrence of spring frosts, has long been neglected. A large elevational gradient of forests on the southeastern Tibetan Plateau provides an ideal platform to explore correlates of spring phenology and environmental factors. We tested the hypothesis that spring frost was a major factor regulating the timing of bud-leaf phenology by combining 5 years of in situ phenological observations of Abies georgei var. smithii with concurrent air temperature data along two altitudinal gradients. Mean lapse rate for the onset of bud swelling and leaf unfolding was 3.1 ± 0.5 days/100 m and 3.0 ± 0.6 days/100 m, respectively. Random forest analysis and conditional inference trees revealed that the frequency of freezing events was a critical factor in determining the timing of bud swelling, independent of topographic differences, varying accumulation of chilling days, and degree-days. In contrast, the onset of leaf unfolding was primarily controlled by the bud swelling onset. Thus, the timing of bud swelling and leaf unfolding appear to be controlled directly and indirectly, respectively, by spring frost. Using space-for-time substitution, the frequency of spring freezing events decreased by 7.1 days with 1 °C of warming. This study provides evidence for impacts of late spring frosts on spring phenology, which have been underappreciated in research on phenological sensitivity to climate but should be included in phenology models. Fewer spring freezing events with warming have important implications for the upward migration of alpine forests and treelines.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0020-7128
Volume:63
Numéro:7
Pages:p. 963-972
Version évaluée par les pairs:Oui
Date:2019
Identifiant unique:10.1007/s00484-019-01710-4
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
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:spring phenology, bud swelling, leaf unfolding, conifer, spring frost, Abies georgei var. smithii, altitudinal gradient, juvenile Smith fir
Déposé le:01 juin 2023 14:46
Dernière modification:01 juin 2023 14:46
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