Table 2
The average (±sd) of environmental parameters are measured in different seasons in the Azad Dam Lake.
| Variables | Summer, 2015 | Autumn, 2015 | Winter, 2016 | Spring, 2016 |
|---|---|---|---|---|
| WT (°C) | 24.9 ± 1.18 | 13.9 ± 0.22 | 6.4 ± 0.05 | 18.1 ± 1.41 |
| AT (°C) | 26.5 ± 5.79 | 13.2 ± 1.3 | 4.9 ± 1.93 | 18.2 ± 4.70 |
| SD (m) | 2.4 ± 0.76 | 3.0 ± 0.8 | 2.4 ± 0.84 | 1.0 ± 0.14 |
| Turb (NTU) | 3.0 ± 0.99 | 3.9 ± 1.15 | 2.9 ± 0.84 | 9.5 ± 2.47 |
| TSS (mg/l) | 0.021 ± 0.001 | 0.022 ± 0.002 | 0.020 ± 0.001 | 0.029 ± 0.004 |
| TDS (mg/l) | 137 ± 12.69 | 137.2 ± 2.39 | 154.9 ± 3.32 | 125.9 ± 12.83 |
| DO (mg/l) | 8.5 ± 1.89 | 11.7 ± 1.17 | 12 ± 2.84 | 13.1 ± 3.8 |
| BOD5 (mg/l) | 1.2 ± 0.82 | 2.9 ± 0.83 | 2.9 ± 1.54 | 3.5 ± 1.11 |
| COD (mg/l) | 11.6 ± 5.35 | 5.8 ± 1.3 | 5.2 ± 1.92 | 5.6 ± 2.07 |
| pH | 7.9 ± 0.33 | 7.4 ± 0.35 | 7.9 ± 0.29 | 8.4 ± 0.19 |
| PO43− (mg/l) | 0.022 ± 0.012 | 0.013 ± 0.005 | 0.014 ± 0.003 | 0.012 ± 0.004 |
| TP (mg/l) | 0.146 ± 0.015 | 0.026 ± 0.002 | 0.042 ± 0.007 | 0.043 ± 0.004 |
| NO2– (mg/l) | 0.002 ± 0.001 | 0.004 ± 0.003 | 0.002 ± 0.001 | 0.003 ± 0.002 |
| NH4+ (mg/l) | 0.049 ± 0.049 | 0.01 ± 0.006 | 0.034 ± 0.017 | 0.033 ± 0.022 |
| NO3−(mg/l) | 0.089 ± 0.032 | 0.264 ± 0.085 | 0.183 ± 0.081 | 0.205 ± 0.051 |
| TN (mg/l) | 1.791 ± 0.083 | 1.552 ± 0.153 | 1.482 ± 0.262 | 1.172 ± 0.137 |
| SiO2 (mg/l) | 0.104 ± 0.014 | 0.215 ± 0.069 | 0.411 ± 0.155 | 0.466 ± 0.296 |
| EC (μs/cm) | 273.9 ± 25.4 | 274.4 ± 4.8 | 309.8 ± 6.6 | 251.8 ± 25.7 |
| TN/TP | 12.4 ± 1.28 | 59.9 ± 4.54 | 35.37 ± 2.94 | 27.6 ± 3.17 |
WT, water temperature; AT, air temperature; SD, Secchi disc depth, Turb, turbidity; TSS, total suspended solids; TDS, total dissolved solids; DO, dissolved oxygen; BOD5, biological oxygen demand; COD, chemical oxygen demand; phosphate, PO43–; TP, total phosphorus; NO2–, nitrite; NO3–, nitrate; TN, total nitrogen; SiO2, silicate; EC, Electric conductivity.
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