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 - Tập 49 - Trang 377-387 - 2005
Dennis D. Baldocchi1, T. A. Black2, P. S. Curtis3, E. Falge4, J. D. Fuentes5, A. Granier6, L. Gu7, A. Knohl8,9, K. Pilegaard10, H. P. Schmid11, R. Valentini12, K. Wilson13, S. Wofsy14, L. Xu1,15, S. Yamamoto16
1Ecosystem Science Division, Department of Environmental Science, Policy and Management, University of California, Berkeley, USA
2Faculty of Agricultural Sciences, University of British Columbia, Vancouver, Canada
3Department of Evolution, Ecology & Organismal Biology, Ohio State University, Columbus, USA
4Bayreuth University, Bayreuth, Germany
5Department of Environmental Sciences, University of Virginia, Charlottesville, USA
6INRA, Champenoux, France
7Environmental Science Division, Oak Ridge National Laboratory Oak Ridge USA
8Max Planck Institute for Biogeochemistry, Jena, Germany
9Present address: ESPM, University of California, Berkeley, USA
10RISOE, Roskilde, Denmark
11Department of Geography, Indiana University, Bloomington, USA
12Department of Forest Science and Environment, Universita’ di Tuscia, Viterbo, Italy
13Atmospheric Turbulence and Diffusion Division, NOAA, Oak Ridge, USA
14Department of Earth and Planetary Science, Harvard University, Cambridge, USA
15Present address: LICOR, Lincoln, USA
16National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

Tóm tắt

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.

Tài liệu tham khảo

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