FIG. 1.
Effects of supplemental H2 on the production of CH4 (A) and volatile fatty acids (B) in bog peat microcosms. Solid symbols indicate microcosms amended with H2; open symbols indicate controls (unamended); •, ○, H2; ▪, □, CH4; ▴, ▵, acetate; ▾, ▿, propionate; ⧫, ◊, butyrate. A detailed view of the production of CH4 during the first 2 days is shown in the inset.