Exponential growth of “snow molds” at sub-zero temperatures: an explanation for high beneath-snow respiration rates and Q 10 values (original) (raw)

Abstract

Numerous studies have demonstrated exceptionally high temperature sensitivity of the beneath-snow respiratory flux in cold-winter ecosystems. The most common, but still untested, explanation for this high sensitivity is a physical one based on the observation that water availability in soils increases exponentially as soils warm from −3 to 0°C. Here, we present evidence for a biological hypothesis to explain exponential kinetics and high Q 10 values as beneath-snow soils warm from −3 to 0°C during the early spring in a high-elevation subalpine forest. First, we show that some of the dominant organisms of the beneath-snow microbial community, “snow molds”, exhibit robust exponential growth at temperatures from −3 to −0.3°C. Second, Q 10 values based on growth rates across the temperature range of −2 to −0.3°C for these snow molds vary from 22 to 330. Third, we derive an analytical equation that combines the relative contributions of microbial growth and microbial metabolism to the temperature sensitivity of respiration. Finally, we use this equation to show that with only moderate snow mold growth (several generations), the combined sensitivities of growth and metabolism to small changes in beneath-snow soil temperature, create a double exponential in the Q 10 function that may explain the extremely high (~1 × 106) Q 10 values observed in past studies. Our biological explanation for high Q 10 levels is supported by several independent studies that have demonstrated build up of microbial biomass under the snow as temperatures warm from −2 to 0°C.

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Acknowledgments

We thank M.M. Gebauer and A.F. Meyer for laboratory assistance and M.W. Williams and N. Trahan for helpful discussions. This work was supported by a grant from the Microbial Observatories Program of the National Science Foundation (MCB-0455606) and a grant from the Western Section of the National Institute for Climate Change Research (NICCR-MPC35TX-A2) administered by Northern Arizona University and funded by the US Department of Energy (BER Program).

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Authors and Affiliations

1. Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309, USA
   S. K. Schmidt, K. L. Wilson & R. K. Monson
2. Department of Biology, San Diego State University, San Diego, CA, 92182-4614, USA
   D. A. Lipson

Authors

1. S. K. Schmidt
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2. K. L. Wilson
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3. R. K. Monson
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4. D. A. Lipson
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Correspondence toS. K. Schmidt.

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Schmidt, S.K., Wilson, K.L., Monson, R.K. et al. Exponential growth of “snow molds” at sub-zero temperatures: an explanation for high beneath-snow respiration rates and Q 10 values.Biogeochemistry 95, 13–21 (2009). https://doi.org/10.1007/s10533-008-9247-y

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• Received: 13 May 2008
• Accepted: 04 September 2008
• Published: 26 September 2008
• Issue Date: August 2009
• DOI: https://doi.org/10.1007/s10533-008-9247-y

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