TABLE 1.
Denitrification values measured with the 15N IPTa
| Method | Reference | Water system | 14NO3− concn (μM) | 15NO3− concn (μM) | D values (mmol m−2 day−1)
|
||
|---|---|---|---|---|---|---|---|
| Dw | Dn | Dtot | |||||
| Batch-mode assay | Cabrita and Brotas (5) | Estuary | 0–71 | 0.0–4.9 | 0–0.8 | 0–5.6 | |
| Christensen et al. (7) | Estuary | 0–27 | 13–60 | 0.0–3.8 | 0.0–0.8 | 0.0–4.0 | |
| Dong et al. (9) | Estuary | 3–1,171 | 50/100 | 0–120 | 0–30 | 0–150 | |
| Eriksson and Weisner (10) | Shallow reservoir | ∼333 | 333 | 0.4/0.5∗ | |||
| Friedrich et al. (unpublished) | Shallow lake | 24–110 | 3–36 | 1.0–4.9 | 0.0–0.5 | 0.3–5.4 | |
| Glud et al. (12) | Coastal water | 9–12 | 70 | 0.02–0.06 | 0.14–0.58 | 0.16–0.64 | |
| Gran and Pitkänen (13) | Estuary | 9–14 | 100 | 0.0–1.3 | |||
| Jensen et al. (15) | Coastal water | 0–70 | 30–60 | 0.0–1.5 | |||
| Krause-Jensen et al. (17) | Estuary | 0.0 | 0.5–0.7 | 0.5–0.7 | |||
| Kristensen et al. (18) | Mangrove forest | 0.6–0.7 | 30 | 0.0 | 0.01–0.05 | 0.01–0.05 | |
| Lohse et al. (19) | Coastal water | <1 | 61–83 | 0.005–0.020 | 0.3 | 0.3 | |
| Mengis et al. (20) | Deep lake | 3.6/3.9 | 0 | 3.6/3.9 | |||
| Nielsen (23) | River | 0 | 56 | 0 | 0.5 | 0.5 | |
| River | 0 | 19 | 0 | 0.5 | 0.5 | ||
| Nielsen and Glud (24) | Coastal water | 0/8 | 55–76 | 0.0/0.2 | 0.3 | 0.3/0.5 | |
| Nielsen et al. (25) | Estuary | 0–300 | 50–100 | 0.1–1.6 | |||
| Ogilvie et al. (27) | Estuary | <10–1,200 | +50–100 | 0.0–8.0 | 0.0–8.9 | 0.1–11.0 | |
| Pelegrí and Blackburn (28) | Estuary | 0.2–1.0∗∗∗ | |||||
| Pelegrí et al. (29) | Estuary | 14 | 58 | 0.1–1.0 | 0.2–0.4 | 0.3–1.4 | |
| Estuary | 15 | 134 | 0.1–0.8 | 0.2–0.4 | 0.3–1.2 | ||
| Pind et al. (30) | River | 40–520 | 20–260 | 0.0–15.6 | 0.0–4.1 | 0–18.0 | |
| Risgaard-Petersen et al. (34) | Shallow lake | 0–325 | 50–100 | 0.1–2.4 | |||
| Rysgaard et al. (35) | Estuary | 0–1100 | 20–250 | 0.0–1.4 | 0.03–0.4 | 0.05–1.80 | |
| Steingruber (42) | Shallow lake | 78 | 6 | 6.8–7.2 | 0.3–2.7 | 5.0–7.4 | |
| Sundbäck and Miles (43) | Coastal water | 0.0–1.4 | |||||
| Sundbäck et al. (44) | Coastal water | <1–30 | 60 | 0.0–1.0 | 0.0–1.9 | 0.0–2.9 | |
| Svensson (45) | Shallow lake | 0.5 | 37 | 0.0–1.1 | 0.5–2.6∗∗ | ||
| Shallow lake | 0.5 | 309 | 0.0–1.1 | 3.0–9.3∗∗ | |||
| Svensson et al. (46) | Coastal water | 5–135 | 0.0–5.1 | 0.0–1.9 | 0.0–7.0 | ||
| Svensson and Leonardson (47) | Shallow lake | 57 | 208 | 0.9–12.8∗∗ | 0.0–0.8∗∗ | ||
| Tuominen et al. (49) | Coastal water | 3–13 | 100 | 0.0–0.3 | 0.0–0.4 | 0.1–0.7 | |
| Tuominen et al. (50) | Coastal water | 0.0–0.3 | |||||
| van Luijn et al. (52) | Shallow lake | 0 | 40–120 | 0 | 0.4–3.4 | 0.4–3.4 | |
| Welsh et al. (53) | Coastal water | 2–22 | 30 | <0.05 | 0.02–0.10 | 0.05–0.14 | |
| Benthic flux chamber | Mengis et al. (20) | Deep lake | 213 | 62 | 4.3 | 0 | 4.3 |
| Nielsen and Glud (25) | Coastal water | 0/8 | 35/50 | 0/0.01 | 0.3/0.4 | 0.3/0.5 | |
| Water enclosure | Risgaard-Petersen et al. (32) | Shallow lake | <1 | 100/30 | 0 | 1.2/3.6 | 1.2/3.6 |
| Flow through system | Risgaard-Petersen et al. (32) | Shallow lake | 2 | 198 | 0 | 3.6 | 3.6 |
| Risgaard-Petersen et al. (33) | Shallow lake | 14 | 93 | 0.4–2.5 | 0.1–0.5 | 0.9–2.6 | |
| Estuary | 14 | 93 | 1.6–4.8 | 0.4–0.8 | 2.1–5.2 | ||
| Rysgaard et al. (36) | Shallow lake | 14 | 93 | 3.6 | 0.1–0.6 | 3.7–4.2 | |
| Estuary | 14 | 93 | 4.8 | 0.8–1.0 | 5.6–5.8 | ||
| Rysgaard et al. (37) | Shallow lake | 7.6–0.6 | 0–2 | 7.6–2.6 | |||
a
15N IPT was done, in some instances, with the addition of macrophytes (∗), chironomids (∗∗), or Nereis sp. (∗∗∗). A plus sign (+) indicates the increase in nitrate concentration due to tracer addition.