Letter | Published:

Declining global warming effects on the phenology of spring leaf unfolding

Nature volume 526, pages 104107 (01 October 2015) | Download Citation

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Abstract

Earlier spring leaf unfolding is a frequently observed response of plants to climate warming1,2,3,4. Many deciduous tree species require chilling for dormancy release, and warming-related reductions in chilling may counteract the advance of leaf unfolding in response to warming5,6. Empirical evidence for this, however, is limited to saplings or twigs in climate-controlled chambers7,8. Using long-term in situ observations of leaf unfolding for seven dominant European tree species at 1,245 sites, here we show that the apparent response of leaf unfolding to climate warming (ST, expressed in days advance of leaf unfolding per °C warming) has significantly decreased from 1980 to 2013 in all monitored tree species. Averaged across all species and sites, ST decreased by 40% from 4.0 ± 1.8 days °C−1 during 1980–1994 to 2.3 ± 1.6 days °C−1 during 1999–2013. The declining ST was also simulated by chilling-based phenology models, albeit with a weaker decline (24–30%) than observed in situ. The reduction in ST is likely to be partly attributable to reduced chilling. Nonetheless, other mechanisms may also have a role, such as ‘photoperiod limitation’ mechanisms that may become ultimately limiting when leaf unfolding dates occur too early in the season. Our results provide empirical evidence for a declining ST, but also suggest that the predicted strong winter warming in the future may further reduce ST and therefore result in a slowdown in the advance of tree spring phenology.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (41125004 and 31321061), the 111 Project (B14001), and National Youth Top-notch Talent Support Program in China. Y.H.F. is supported by an FWO Pegasus Marie Curie Fellowship. I.A.J., P.C. and J.P. acknowledge support from the European Research Council through Synergy grant ERC-2013-SyG-610028 “IMBALANCE-P” and A.M. acknowledges support through the (FP7/2007-2013)/ERC grant 282250 “E3-Extreme Event Ecology”. I.A.J. acknowledges support from the University of Antwerp Centre of Excellence “GCE”. The authors acknowledge all members of the PEP725 project for providing the phenological data.

Author information

Affiliations

  1. Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China

    • Yongshuo H. Fu
    • , Hongfang Zhao
    • , Shilong Piao
    • , Shushi Peng
    • , Philippe Ciais
    • , Mengtian Huang
    •  & Zhenzhong Zeng
  2. Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium

    • Yongshuo H. Fu
    •  & Ivan A. Janssens
  3. Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China

    • Shilong Piao
  4. Center for Excellence in Tibetan Earth Science, Chinese Academy of Sciences, Beijing 100085, China

    • Shilong Piao
  5. Laboratoire des Sciences du Climat et de l’Environnement, CEA CNRS UVSQ, Gif-sur-Yvette 91190, France

    • Marc Peaucelle
    • , Shushi Peng
    •  & Philippe Ciais
  6. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China

    • Guiyun Zhou
  7. Ecoclimatology, Technische Universität München, Freising 85354, Germany

    • Annette Menzel
  8. Technische Universität München, Institute for Advanced Study, Lichtenbergstraße 2a, 85748 Garching, Germany

    • Annette Menzel
  9. CREAF, Cerdanyola del Vallès, Barcelona 08193, Catalonia, Spain

    • Josep Peñuelas
  10. CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, Barcelona 08193, Catalonia, Spain

    • Josep Peñuelas
  11. Department of Atmospheric Sciences, University of Illinois, Urbana, Illinois 61801, USA

    • Yang Song
  12. University of Neuchatel, Institute of Geography, Neuchatel 2000, Switzerland

    • Yann Vitasse
  13. WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Neuchatel 2000, Switzerland

    • Yann Vitasse
  14. WSL Institute for Snow and Avalanche Research SLF, Group Mountain Ecosystems, Davos 7260, Switzerland.

    • Yann Vitasse

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Contributions

Y.H.F. and H.Z. contributed equally to this work. S.Pi., Y.H.F. and I.A.J. designed the research; H.Z., Y.H.F., M.P., S.Pe. and G.Z. performed the analysis; Y.H.F., S.Pi. and I.A.J. drafted the paper; and Y.H.F., S.Pi., I.A.J., H.Z., M.P., S.Pe., G.Z., P.C., M.H., A.M., J.P., Y.S., Y.V. and Z.Z. contributed to the interpretation of the results and to the writing of the paper.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Shilong Piao.

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DOI

https://doi.org/10.1038/nature15402

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