Fig. 2: The soil mass-specific CH4 respiration rate decreased under warming and increased under cooling. | Nature Communications

Fig. 2: The soil mass-specific CH4 respiration rate decreased under warming and increased under cooling.

From: The thermal response of soil microbial methanogenesis decreases in magnitude with changing temperature

Fig. 2

a, c The Greater Khingan Range; b, d The Tibetan Plateau. The abundance of mcrA gene copies was used as a proxy for the biomass of methanogens. A linear mixed-effects model was used to test for incubation and assay temperature effects on the soil mass-specific CH4 respiration (CH4-Rmass), the fixed factors were the incubation temperature (RT − 4 °C, RT, and RT + 4 °C; Treat) and assay temperature (8, 12, and 16 °C; Assay), and the random factor was the spatial replicates within each wetland in a and b. For clarity the values in c and d are the natural log of the treatment (RT − 4°C or RT + 4°C): control (RT) ratios of CH4-Rmass following 160 days of experimental warming and cooling. Ratios > 0 indicate a greater CH4-Rmass in the treatment than in the control, and ratios < 0 indicate the reverse. RT, reference temperature (12 °C). Data are presented as mean values ± SEM, n = 4 independent soil samples.

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