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Deciphering the multiple effects of climate warming on the temporal shift of leaf unfolding

Author

Listed:
  • Haicheng Zhang

    (Université libre de Bruxelles)

  • Isabelle Chuine

    (IRD)

  • Pierre Regnier

    (Université libre de Bruxelles)

  • Philippe Ciais

    (IPSL-LSCECEA/CNRS/UVSQ Saclay)

  • Wenping Yuan

    (Sun Yat-sen University)

Abstract

Changes in winter and spring temperatures have been widely used to explain the diverse responses of spring phenology to climate change. However, few studies have quantified their respective effects. Using 386,320 in situ observations of leaf unfolding date (LUD) of six tree species in Europe, we show that accelerated spring thermal accumulation and changes in winter chilling explain, on average, 61% and 39%, respectively, of the advancement in LUD for the period 1951–2019. We find that winter warming may not have delayed bud dormancy release, but rather it has increased the thermal requirement in reaching leaf unfolding. This increase in thermal requirement and the decreased efficiency of spring warming for thermal accumulation partly explain the weakening response of leaf unfolding to warming. Our study stresses the need to better assess the antagonistic and heterogeneous effects of winter and spring warming on leaf phenology, which is key to projecting future vegetation–climate feedbacks.

Suggested Citation

  • Haicheng Zhang & Isabelle Chuine & Pierre Regnier & Philippe Ciais & Wenping Yuan, 2022. "Deciphering the multiple effects of climate warming on the temporal shift of leaf unfolding," Nature Climate Change, Nature, vol. 12(2), pages 193-199, February.
  • Handle: RePEc:nat:natcli:v:12:y:2022:i:2:d:10.1038_s41558-021-01261-w
    DOI: 10.1038/s41558-021-01261-w
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