Soil respiration represents a key component of the global carbon (C) cycle, as it is the largest flux of C from terrestrial systems over annual timescales (Amundson, 2001). In many cases, the flux of carbon dioxide (CO 2 ) from the soil surface is assumed to equal the CO 2 produced by respiring roots and organisms in soil (Cerling, 1984). Indeed, most ecosystem carbon cycle models from the plot to the global scale simulate soil CO 2 flux as equivalent to soil respiration (Oleson et al., 2010;Shi et al., 2018;Thornton et al., 2002). Soil C flux (modeled as soil respiration) is most often simulated as a function of soil temperature and moisture (Brook et al., 1983;Lloyd & Taylor, 1994;Raich & Schlesinger, 1992). However, respired CO 2 has the potential to participate in a range of reactions in the soil system that may lower the measured soil CO 2 flux by over 50% (

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