Fig. 4

The methanogenesis (A), aerobic methane oxidation (B) pathways and relative abundance of functional genes encoding corresponding enzymes. The arrows and blocks with different colors represented specific pathways that were marked. The pies next to the arrow showed the functional genes abundance at 0 ∼ 20 cm 20 ∼ 40 cm layers in Wetland and Dryland respectively. Abbreviations: PHB, poly-beta-hydroxybutyrate; RuMP: the ribulose monophosphate