Articles | Volume 17, issue 7
https://doi.org/10.5194/gmd-17-2705-2024
https://doi.org/10.5194/gmd-17-2705-2024
Model description paper
 | 
12 Apr 2024
Model description paper |  | 12 Apr 2024

Optimal enzyme allocation leads to the constrained enzyme hypothesis: the Soil Enzyme Steady Allocation Model (SESAM; v3.1)

Thomas Wutzler, Christian Reimers, Bernhard Ahrens, and Marion Schrumpf

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Cited articles

Ahrens, B., Braakhekke, M. C., Guggenberger, G., Schrumpf, M., and Reichstein, M.: Contribution of sorption, DOC transport and microbial interactions to the 14C age of a soil organic carbon profile: Insights from a calibrated process model, Soil Biol. Biochem., 88, 390–402, https://doi.org/10.1016/j.soilbio.2015.06.008, 2015. a
Arrieta, J. M., Mayol, E., Hansman, R. L., Herndl, G. J., Dittmar, T., and Duarte, C. M.: Dilution limits dissolved organic carbon utilization in the deep ocean, Science, 348, 331–333, https://doi.org/10.1126/science.1258955, 2015. a
Calabrese, S., Mohanty, B. P., and Malik, A. A.: Soil microorganisms regulate extracellular enzyme production to maximize their growth rate, Biogeochemistry, 158, 303–312, https://doi.org/10.1007/s10533-022-00899-8, 2022. a
Carvalhais, L. C., Dennis, P. G., Tyson, G. W., and Schenk, P. M.: Application of metatranscriptomics to soil environments, J. Microb. Meth., 91, 246–251, https://doi.org/10.1016/j.mimet.2012.08.011, 2012. a
Cheng, W., Parton, W. J., Gonzalez-Meler, M. A., Phillips, R., Asao, S., McNickle, G. G., Brzostek, E., and Jastrow, J. D.: Synthesis and modeling perspectives of rhizosphere priming, New Phytol., 201, 31–44, https://doi.org/10.1111/nph.12440, 2014. a
Short summary
Soil microbes provide a strong link for elemental fluxes in the earth system. The SESAM model applies an optimality assumption to model those linkages and their adaptation. We found that a previous heuristic description was a special case of a newly developed more rigorous description. The finding of new behaviour at low microbial biomass led us to formulate the constrained enzyme hypothesis. We now can better describe how microbially mediated linkages of elemental fluxes adapt across decades.
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