Table 2. Physicochemical data from six sites along the Sipsey River, AL, USA.
“Surface” measurements reflect readings from the water column and “pore” reflects porewater readings. Sites are ordered moving downstream and the distance from the first site is noted. Three measurements of each environmental parameter were recorded between June 9 and September 28, 2016. Data shown reflects the means of these three measurements and the standard error.
| Metric | Sample site | |||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Distance (km) | 0 | 7.2 | 10.7 | 14.0 | 27.4 | 44.6 |
| Surface ammonia (μg L-1) | 24.3 ± 0.6 | 19.7 ± 1.3 | 21.1 ± 0.3 | 8.4 ± 0.1 | 18.5 ± 0.1 | 17.5 ± 0.4 |
| Pore ammonia (μg L-1) | 127.5 ± 22.6 | 269.0 ± 171.8 | 164.3 ± 70.6 | 268.7 ± 55.4 | 117.1 ± 65.5 | 501.0 ± 228.1 |
| Surface orthophostate (μg L-1) | 7.3 ± 1.1 | 5.2 ± 0.4 | 4.8 ± 0.2 | 2.1 ± 0.2 | 5.8 ± 0.3 | 4.8 ± 0.1 |
| Pore orthophosphate (μg L-1) | 8.0 ± 1.4 | 6.1 ± 0.8 | 15.3 ± 7.9 | 1.2 ± 0.3 | 17.9 ± 8.8 | 20.3 ± 12.3 |
| Surface nitrite (μg L-1) | 4.5 ± 0.3 | 2.7 ± 0.2 | 2.0 ± 0.2 | 15.9 ± 0.8 | 3.1 ± 0.1 | 2.4 ± 0.2 |
| Pore nitrite (μg L-1) | 4.3 ± 1.0 | 3.0 ± 1.4 | 1.3 ± 0.1 | 30.2 ± 9.0 | 6.2 ± 1.9 | 29.0 ± 26.5 |
| Surface nitrate (μg L-1) | 309.0 ± 19.3 | 309.0 ± 19.3 | 309.0 ± 19.3 | 154.8 ± 1.0 | 350.9 ± 0.1 | 201.0 ± 4.6 |
| Pore nitrate (μg L-1) | 10.1 ± 8.9 | 20.4 ± 2.5 | 13.7 ± 7.0 | 31.2 ± 8.9 | 40.3 ± 11.8 | 10.6 ± 7.2 |
| Temperature (°C) | 26.2 ± 0.5 | 25.7 ± 0.7 | 27.1 ± 0.5 | 27.5 ± 0.8 | 28.2 ± 1.0 | 27.4 ± 0.3 |
| pH | 7.2 ± 0.1 | 7.2 ± 0.0 | 7.2 ± 0.0 | 7.3 ± 0.1 | 7.2 ± 0.1 | 7.2 ± 0.1 |
| Specific conductance (μS cm-1) | 141.9 ± 29.6 | 127.5 ± 13.7 | 140.2 ± 9.1 | 134.4 ± 12.3 | 80.1 ± 38.9 | 119.8 ± 20.4 |
| Conductivity (μS cm-1) | 144.7 ± 29.0 | 130.3 ± 15.5 | 145.8 ± 10.8 | 141.3 ± 14.8 | 113.5 ± 20.8 | 122.3 ± 21.3 |
| Dissolve oxygen (mg L-1) | 7.0 ± 1.0 | 6.8 ± 0.1 | 5.4 ± 0.0 | 6.8 ± 0.1 | 7.4 ± 0.6 | 5.3 ± 0.8 |