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Dependence of the Q10 values on the depth of the soil temperature measuring point

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Abstract

The parameter Q10 is commonly used to express the relationship between soil CO2 efflux and soil temperature. One advantage of this parameter is its application in a model expression of respiration losses of different ecosystems. Correct specification of Q10 in these models is indispensable. Soil surface CO2 efflux and soil temperature at different depths were measured in a 21-year-old Norway spruce stand and a mountain grassland site located at the Experimental Ecological Study Site Bily Kriz, Beskydy Mts. (NE Czech Republic), using automated gasometric systems. A time-delay and goodness-of-fit between soil CO2 efflux and soil temperature at different measuring depths were determined. Wide ranges of values for the time-delay of CO2 efflux in response to temperature, Q10 and the determination coefficient (R2) between CO2 efflux and temperature were obtained at the both sites. The values of Q10 and the CO2 time-delay increased with depth, while the R2 of the CO2-temperature relationship significantly decreased. Soil temperature records obtained close to the soil surface showed the highest values of R2 and the lowest value of the time-delay at both sites. Measurement of soil temperature at very shallow soil layer, preferably at the soil surface, is highly recommended to determine useable values of Q10. We present a new procedure to normalize Q10 values for soil temperatures measured at different depths that would facilitate comparison of different sites.

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Acknowledgments

This work was supported by grants GACR 526/03/H036, MSMT CR VaV/640/18/03, EU GOCE-CT-2003-505572 and the research intention AV0Z60870520 (Academy of Sciences of the Czech Republic). Marian Pavelka and Manual Acosta were also supported by the programme ‘The Role of Soils in the Terrestrial Carbon Balance’ by the European Science Foundation.

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Authors and Affiliations

  1. Laboratory of Plants Ecological Physiology, Institute of Systems Biology and Ecology, Academy of Sciences of the Czech Republic, Porici 3b, Brno, 603 00, The Czech Republic

    Marian Pavelka, Manuel Acosta, Michal V. Marek & Dalibor Janous

  2. Max Planck Institute for Biochemistry, Hans Knoll Str. 10, Jena, Germany

    Werner Kutsch

Authors
  1. Marian Pavelka
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  2. Manuel Acosta
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  3. Michal V. Marek
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  4. Werner Kutsch
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  5. Dalibor Janous
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Correspondence to Marian Pavelka.

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Pavelka, M., Acosta, M., Marek, M.V. et al. Dependence of the Q10 values on the depth of the soil temperature measuring point. Plant Soil 292, 171–179 (2007). https://doi.org/10.1007/s11104-007-9213-9

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  • DOI: https://doi.org/10.1007/s11104-007-9213-9

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