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Predicting the onset of net carbon uptake by deciduous forests with soil temperature and climate data: a synthesis of FLUXNET data

International Journal of Biometeorology volume 49, pages 377–387 (2005)Cite this article

Abstract

We tested the hypothesis that the date of the onset of net carbon uptake by temperate deciduous forest canopies corresponds with the time when the mean daily soil temperature equals the mean annual air temperature. The hypothesis was tested using over 30 site-years of data from 12 field sites where CO2 exchange is being measured continuously with the eddy covariance method. The sites spanned the geographic range of Europe, North America and Asia and spanned a climate space of 16°C in mean annual temperature. The tested phenology rule was robust and worked well over a 75 day range of the initiation of carbon uptake, starting as early as day 88 near Ione, California to as late as day 147 near Takayama, Japan. Overall, we observed that 64% of variance in the timing when net carbon uptake started was explained by the date when soil temperature matched the mean annual air temperature. We also observed a strong correlation between mean annual air temperature and the day that a deciduous forest starts to be a carbon sink. Consequently we are able to provide a simple phenological rule that can be implemented in regional carbon balance models and be assessed with soil and temperature outputs produced by climate and weather models.

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Acknowledgements

We thank the technicians, students and postdoctoral students who helped collect data at all the field sites and the funding agencies that supported the numerous team. The senior author is supported by the NASA FLUXNET project and DOE Terrestrial Carbon Program (DE-FG0203ER63638)

Author information

Affiliations

  1. Ecosystem Science Division, Department of Environmental Science, Policy and Management, University of California, 151 Hilgard Hall, Berkeley, CA, 94720, USA

    Dennis D. Baldocchi & L. Xu

  2. Faculty of Agricultural Sciences, University of British Columbia, Vancouver, BC, Canada

    T. A. Black

  3. Department of Evolution, Ecology & Organismal Biology, Ohio State University, Columbus, OH, USA

    P. S. Curtis

  4. Bayreuth University, Bayreuth, Germany

    E. Falge

  5. Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA

    J. D. Fuentes

  6. INRA, Champenoux, France

    A. Granier

  7. Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

    L. Gu

  8. Max Planck Institute for Biogeochemistry, Jena, Germany

    A. Knohl

  9. RISOE, Roskilde, Denmark

    K. Pilegaard

  10. Department of Geography, Indiana University, Bloomington, IN, USA

    H. P. Schmid

  11. Department of Forest Science and Environment, Universita’ di Tuscia, Viterbo, Italy

    R. Valentini

  12. Atmospheric Turbulence and Diffusion Division, NOAA, Oak Ridge, TN, USA

    K. Wilson

  13. Department of Earth and Planetary Science, Harvard University, Cambridge, MA, USA

    S. Wofsy

  14. National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8569, Japan

    S. Yamamoto

  15. Present address: LICOR, Lincoln, NE, USA

    L. Xu

  16. Present address: ESPM, University of California, Berkeley, CA, USA

    A. Knohl

Authors
  1. Dennis D. Baldocchi
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  2. T. A. Black
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  3. P. S. Curtis
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  4. E. Falge
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  5. J. D. Fuentes
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  6. A. Granier
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  7. L. Gu
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  8. A. Knohl
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  9. K. Pilegaard
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  10. H. P. Schmid
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  11. R. Valentini
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  12. K. Wilson
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  13. S. Wofsy
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  14. L. Xu
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  15. S. Yamamoto
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Correspondence to Dennis D. Baldocchi.

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Baldocchi, D.D., Black, T.A., Curtis, P.S. et al. Predicting the onset of net carbon uptake by deciduous forests with soil temperature and climate data: a synthesis of FLUXNET data. Int J Biometeorol 49, 377–387 (2005). https://doi.org/10.1007/s00484-005-0256-4

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  • DOI: https://doi.org/10.1007/s00484-005-0256-4

Keywords

  • Phenology
  • Eddy covariance
  • CO2 exchange
  • Canopy photosynthesis