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The abundance of archaeal amoA, archaeal hcd, and bacterial amoA genes in soil microcosms after incubation with a headspace concentration of 5% (vol/vol) 12C- or 13C-CO2 for 14 or 28 d. Data plotted are mean values and SEs from triplicate microcosms destructively sampled at each time point. The same letter above different bars indicates no significant difference (P > 0.05).
