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. 2003 Jan;69(1):74–83. doi: 10.1128/AEM.69.1.74-83.2003

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
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.

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