Articles | Volume 18, issue 16
https://doi.org/10.5194/bg-18-4755-2021
https://doi.org/10.5194/bg-18-4755-2021
Research article
 | 
20 Aug 2021
Research article |  | 20 Aug 2021

Soil profile connectivity can impact microbial substrate use, affecting how soil CO2 effluxes are controlled by temperature

Frances A. Podrebarac, Sharon A. Billings, Kate A. Edwards, Jérôme Laganière, Matthew J. Norwood, and Susan E. Ziegler

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Cited articles

Alster, C. J., Fischer, von, J. C., Allison, S. D., and Treseder, K. K.: Embracing a new paradigm for temperature sensitivity of soil microbes, Glob. Change Biol., 26, 3221–3229, https://doi.org/10.1111/gcb.15053, 2020. 
Basler, A., Dippold, M., Helfrich, M., and Dyckmans, J.: Microbial carbon recycling – An underestimated process controlling soil carbon dynamics – Part 1: A long-term laboratory incubation experiment, Biogeosciences, 12, 5929–5940, https://doi.org/10.5194/bg-12-5929-2015, 2015. 
Benner, R., Fogel, M., Spargue, K., and Hodson, R.: Depletion of 13C in lignin and its implications for stable carbon isotope studies, Nature, 329, 708–710, https://doi.org/10.1038/329708a0, 1987. 
Billings, S. A. and Ballantyne, F.: How interactions between microbial resource demands, soil organic matter stoichiometry, and substrate reactivity determine the direction and magnitude of soil respiratory responses to warming, Glob. Change Biol., 19, 90–102, https://doi.org/10.1111/gcb.12029, 2013. 
Bingeman, C. W., Varner, J. E., and Martin, W. P.: The Effect of the Addition of Organic Materials on the Decomposition of an Organic Soil, Soil Sci. Soc. Am. J., 17, 34–38, https://doi.org/10.2136/sssaj1953.03615995001700010008x, 1953. 
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Short summary
Soil respiration is a large and temperature-responsive flux in the global carbon cycle. We found increases in microbial use of easy to degrade substrates enhanced the temperature response of respiration in soils layered as they are in situ. This enhanced response is consistent with soil composition differences in warm relative to cold climate forests. These results highlight the importance of the intact nature of soils rarely studied in regulating responses of CO2 fluxes to changing temperature.
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