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Table 1
Means values ± standard error (n = 43) of environmental variables of the Xiquanyan reservoir. Differences between the seasons were tested by Tukey HSD ANOVA. Values with same superscripts in each column are not significantly different.
| Spring | Summer | Autumn | p-value | |
|---|---|---|---|---|
| Water temperature (°C) | 6.31 ± 0.28a | 24.31 ± 0.18b | 12.69 ± 0.30c | 0.000 |
| pH | 7.14 ± 0.07a | 9.16 ± 0.11b | 7.75 ± 0.10c | 0.000 |
| Dissolved oxygen(mg/L) | 7.40 ± 0.40a | 6.67 ± 0.27a | 6.96 ± 0.23a | 0.354 |
| Conductivity (mS/m) | 0.09 ± 0.00a | 0.14 ± 0.01b | 0.12 ± 0.00a,b | 0.002 |
| Water transparency (m) | 0.46 ± 0.09a | 0.84 ± 0.04b,c | 0.78 ± 0.07b,c | 0.000 |
| Turbidity (NTU) | 58.42 ± 18.41a | 21.99 ± 3.89b,c | 23.83 ± 1.33b,c | 0.006 |
| Chloride (mg/L) | 3.63 ± 0.43a | 7.73 ± 0.62b,c | 6.42 ± 0.62b,c | 0.000 |
| Total nitrogen (mg/L) | 0.66 ± 0.02a | 0.91 ± 0.0 a | 0.69 ± 0.02a | 0.150 |
| Ammonium (μg/L) | 8.78 ± 1.04a | 1.82 ± 0.24b,c | 3.00 ± 0.69b,c | 0.000 |
| Nitrate (mg/L) | 0.26 ± 0.04a | 0.55 ± 0.11a,b | 0.22 ± 0.02a,c | 0.014 |
| Total phosphorus (mg/L) | 0.11 ± 0.03a | 0.07 ± 0.01a,b | 0.13 ± 0.03a,c | 0.013 |
| Chemical oxygen demand (mg/L) | 4.73 ± 0.18a | 4.96 ± 0.23a | 5.04 ± 0.17a | 0.838 |
| Chlorophyll-a (μg/L) | 3.32 ± 0.53a | 17.54 ± 2.32b,c | 19.03 ± 2.07b,c | 0.000 |
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