Table 1.
Physical and chemical characteristics (mean ± standard deviation) in water upstream and downstream of Gongguoqiao hydroelectric dam.
| Site | Temperature (°C) | pH | DO (mg·L−1) | ORP (mV) | EC (μS·cm−1) | Turbidity (NTU) | Chl a (μg·L−1) | TDS (g·L−1) | TN (mg·L−1) | TP (mg·L−1) | Bacterial Abundance (×106 Cell·mL−1) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry season | |||||||||||
| S1 | 10.9 ± 0.2 | 8.0 ± 0.2 | 15.9 ± 1.3 | 240.7 ± 5.8 | 48.6 ± 2.5 | 84.9 ± 14.4 | 2.2 1 | 0.3 ± 0.0 | 1.6 ± 0.1 | 0.02 ± 0.00 | 2.87 ± 0.01 |
| S2 | 11.6 ± 1.2 | 8.0 ± 0.1 | 16.9 ± 2.9 | 207.0 ± 11.4 | 49.1 ± 1.2 | 85.5 ± 2.2 | 1.3 1 | 0.3 ± 0.0 | 1.5 ± 0.1 | 0.03 ± 0.01 | 0.28 ± 0.12 |
| S3 | 10.2 ± 0.6 | 8.1 ± 0.0 | 14.2 ± 0.5 | 224.7 ± 2.5 | 51.1 ± 0.6 | 99.4 ± 9.5 | 1.4 1 | 0.3 ± 0.0 | 1.7± 0.0 | 0.03 ± 0.00 | 0.92 ± 0.01 |
| S4 | 13.1 ± 0.1 | 8.2 ± 0.2 | 11.4 ± 1.4 | 197.3 ± 11.6 | 41.8 ± 0.2 | 10,300.0 ± 667.9 | 2.9 1 | 0.3 ± 0.0 | 1.5 ± 0.1 | 0.10 ± 0.02 | 0.47 ± 0.02 |
| Normal season | |||||||||||
| S1 | 18.0 ± 0.5 | 7.6 ± 0.0 | 11.4 ± 1.4 | 284.7 ± 10.2 | 40.5 ± 0.2 | 158.7 ± 0.6 | 1.3 ± 0.1 | 0.3 ± 0.0 | 1.5 ± 0.3 | 0.03 ± 0.06 | 1.62 ± 0.93 |
| S2 | 21.0 ± 0.1 | 7.4 ± 0.1 | 7.4 ± 0.6 | 267.7 ± 27.0 | 41.9 ± 0.1 | 170.3 ± 3.2 | 1.2 ± 0.0 | 0.3 ± 0.0 | 1.3 ± 0.3 | 0.14 ± 0.08 | 0.59 ± 0.19 |
| S3 | 17.9 ± 0.8 | 7.3 ± 0.0 | 8.2 ± 0.4 | 262.3 ± 37.5 | 41.1 ± 0.3 | 197.3 ± 19.3 | 1.5 ± 0.1 | 0.3 ± 0.0 | 1.4 ± 0.1 | 0.16 ± 0.05 | 1.74 ± 0.31 |
| S4 | 17.4 ± 0.6 | 7.2 ± 0.1 | 8.5 ± 0.2 | 309.3 ± 8.1 | 40.8 ± 0.2 | 185.3 ± 1.5 | 1.3 ± 0.0 | 0.3 ± 0.0 | 1.5 ± 0.2 | 0.85 ± 0.13 | 0.76 ± 0.29 |
| Wet season | |||||||||||
| S1 | 19.1 ± 0.5 | 6.5 ± 0.0 | 4.0 ± 0.1 | 360.0 ± 0.0 | 32.1 ± 0.3 | 625.7 ± 149.6 | 3.3 ± 0.3 | 0.2 ± 0.0 | 0.4 ± 0.1 | 0.10 ± 0.02 | 0.05 ± 0.01 |
| S2 | 20.3 ± 2.1 | 7.5 ± 0.1 | 4.1 ± 0.4 | 289.0 ± 6.6 | 32.5 ± 0.4 | 1715.0 ± 17.3 | 1.4 ± 0.1 | 0.2 ± 0.0 | 0.3 ± 0.0 | 0.10 ± 0.08 | 0.22 ± 0.07 |
| S3 | 20.0 ± 1.9 | 7.7 ± 0.0 | 5.4 ± 0.2 | 286.0 ± 0.0 | 31.8 ± 0.8 | 1826.7 ± 86.7 | 1.2 ± 0.0 | 0.2 ± 0.0 | 0.4 ± 0.2 | 0.06 ± 0.01 | 0.24 ± 0.01 |
| S4 | 19.2 ± 0.6 | 6.4 ± 0.0 | 3.3 ± 0.1 | 347.3 ± 1.5 | 31.1 ± 0.3 | 1815.6 ± 10.2 | 1.3 ± 0.0 | 0.2 ± 0.0 | 0.3 ± 0.1 | 0.24 ± 0.01 | 0.26 ± 0.07 |
1 Only one sample was measured.