TABLE 2.
Effects of supplemental volatile fatty acids on the production of CH4 in acidic bog peat (pH 4.5)
Expt | Volatile fatty acid (5 mM) | pKa | Mean amt of CH4 produced (nmol g [dry wt] of soil−1 day−1) ± SDa |
---|---|---|---|
Ab | None | NAc | 268 ± 19 |
Formate | 3.75 | 28 ± 4 | |
Acetate | 4.76 | 8 ± 4 | |
Bd | None | NA | 541 ± 88 |
Propionate | 4.88 | 96 ± 11 | |
Butyrate | 4.82 | 112 ± 28 |
Rates were calculated from the initial phase of activity (7 to 11 days of incubation; a minimum of five data points were used to calculate rates) in anoxic microcosms (0.95 ≤ r2 ≤ 0.98).
Bog peat sample was collected on 5 May 1999.
NA, not applicable.
Bog peat sample was collected on 25 June 1999.