TABLE 2.
Net N2O production and denitrification rate with no nitrate after 24 h at 15°C with nitrogen-free freshwater medium
| River and site | Distance (km) | N2O production (μmol of N2O-N m−2 h−1 ± SD) | Denitrification (μmol of N m−2 h−1 ± SD) |
|---|---|---|---|
| Swale | |||
| Ravenseat | −2.5, 0.0 | 0.74 ± 0.62 | 5.0 ± 4.0 |
| Ivelet Bridge (April) | 10.9 | −1.42 ± 0.93 | 5.5 ± 0.6 |
| Ivelet Bridge (June) | −2.34 ± 0.71 | 3.5 ± 0.7 | |
| Ivelet Bridge (August) | |||
| Catterick Bridge | 49.9 | 0.25 ± 0.61 | 13.4 ± 1.6 |
| Thornton Manor | 107.9 | 1.23 ± 0.56 | 12.2 ± 3.4 |
| Naburn Weir | 145 | 0.83 ± 0.86 | 9.2 ± 0.36 |
| Wiske | |||
| Wiske (April) | −1.7, 86.1 | 2.72 ± 2.52 | 23.1 ± 9.4 |
| Wiske (June) | −1.57 ± 0.13 | 31.4 ± 3.8 | |
| Wiske (August) | −9.70 ± 2.35 | 6.6 ± 5.8 |