TABLE 2.
Enumeration of sulfate-reducing bacteria in reduced soil horizons in the bank of Gessen Creek with and without metals
| Treatment and electron donor | MPN (cells g [fresh wt] soil−1)a |
|
|---|---|---|
| Br1 | Br2 | |
| Without metals | ||
| Acetate | 2.0 × 104 (0.4 × 104-9.3 × 104) A | 9.3 × 103 (1.9 × 103-4.2 × 104) A |
| Lactate | 2.0 × 104 (0.4 × 104-9.3 × 104) A | 7.0 × 105 (1.5 × 105-3.3 × 106) A |
| With metals | ||
| Acetate | 4.0 × 104 (0.8 × 104-1.9 × 105) A | 4.0 × 103 (0.8 × 103-1.9 × 104) A |
| Lactate | 2.0 × 104 (0.4 × 104-9.3 × 104) A | 4.0 × 104 (0.8 × 104-1.9 × 105) B |
a
Values represent abundances in cells g (fresh weight) of Br1 or Br2 soil−1, determined in triplicate MPN serial dilutions after 5 months of incubation at 16°C. Values in parentheses represent the ranges of MPN values within 95% certainty. Capital letters after values represent significant differences of MPN values between metal treatments for the different soil horizons and electron donors.