Modelling respiration of vegetation: evidence for a general temperature-dependent Q10

Authors

  • Mark G. Tjoelker,

    1. Texas A & M University, Department of Forest Science, 2135 TAMU, College Station, TX 77843-2135, USA,
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  • Jacek Oleksyn,

    1. University of Minnesota, Department of Forest Resources, 1530 Cleveland Ave. N., St. Paul, MN 55108, USA,
    2. Polish Academy of Sciences, Institute of Dendrology, Parkowa 5, PL-62-035 Kórnik, Poland
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  • Peter B. Reich

    1. University of Minnesota, Department of Forest Resources, 1530 Cleveland Ave. N., St. Paul, MN 55108, USA,
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Mark G. Tjoelker, fax +1/979 8456049, e-mail m-tjoelker@tamu.edu

Summary

Temperature responses of rates of respiratory CO2 efflux from plants, soils, and ecosystems are frequently modelled using exponential functions with a constant Q10 near 2.0 (fractional change in rate with a 10 °C increase in temperature). However, we present evidence that Q10 declines with short-term increases in temperature in a predictable manner across diverse plant taxa. Thus, models using a constant Q10 are biased, and use of a temperature-corrected Q10 may improve the accuracy of modelled respiratory CO2 efflux in plants and ecosystems in response to temperature and predicted global climate changes.

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