Table 2
The annual, summer, and winter mean values of Chl a and nutrient concentrations in the pre-restoration period (1998–2002) and post-restoration period (2008–2019). Significance is indicated by P-values in bold based on the GAM model.
| Mean values | Annual | Summer | Winter | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Pre-restoration | Post-restoration | P | Pre-restoration | Post-restoration | P | Pre-restoration | Post-restoration | P | |
| Chl a (μg/L) | 58.1 | 24.3 | <0.01 | 57.0 | 45.7 | 0.07 | 17.7 | 10.0 | 0.02 |
| TN(mg/L) | 5.83 | 1.31 | <0.01 | 3.65 | 1.60 | <0.01 | 7.53 | 1.14 | <0.01 |
| DIN(mg/L) | 4.30 | 0.43 | <0.01 | 2.12 | 0.49 | <0.01 | 5.77 | 0.40 | <0.01 |
| TP(mg/L) | 0.19 | 0.10 | <0.01 | 0.17 | 0.15 | 0.12 | 0.18 | 0.07 | <0.01 |
| SRP(mg/L) | 0.015 | 0.017 | 0.38 | 0.034 | 0.036 | 0.37 | 0.008* | 0.005* | <0.01 |
| TN/TP | 33.3 | 15.5 | <0.01 | 23.3 | 10.9 | <0.01 | 44.3 | 21.2 | <0.01 |
| Chl a/TN | 0.009 | 0.018 | <0.01 | 0.018 | 0.033 | <0.01 | 0.004 | 0.017 | <0.01 |
| Chl a/TP | 0.31 | 0.23 | 0.14 | 0.43 | 0.32 | 0.07 | 0.10 | 0.17 | <0.01 |
| DIN/SRP | 1299 | 81.4 | <0.01 | 299 | 22.8 | <0.01 | 1665 | 137 | <0.01 |
Note that the values of SRP were not reliable below 0.01 mg/L, which is the detection limit of the method used in this study.
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