Fig. 6
Relative methanogenesis in Hani (a), Taishanmiao (b), and Ruokeba (c) peatlands under different substrate additions. *, **, and *** indicate significant differences in relative methanogenesis between treatments and control groups in each peatland at p < 0.05, p < 0.01, and p < 0.001, respectively. Multiple comparisons were performed using Dunnett’s method between control and treatment groups. CK, Me, Ac, and CO2 represent control, methanol-addition, acetate-addition, and sodium bicarbonate/H2-addition groups, respectively