TABLE 2.

Effects of supplemental volatile fatty acids on the production of CH4 in acidic bog peat (pH 4.5)

ExptVolatile fatty acid (5 mM)pKaMean amt of CH4 produced (nmol g [dry wt] of soil−1 day−1) ± SDa
AbNoneNAc268 ± 19
Formate3.7528 ± 4
Acetate4.768 ± 4
BdNoneNA541 ± 88
Propionate4.8896 ± 11
Butyrate4.82112 ± 28
  • a 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).

  • b Bog peat sample was collected on 5 May 1999.

  • c NA, not applicable.

  • d Bog peat sample was collected on 25 June 1999.