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Table 5
Mean values ± SD of organic carbon, sulfates and hydrogen sulfide and acid-soluble sulfides concentrations in the bottom sediment of Lake Gulbinas in August. Asterisks indicate significant differences in each chemical parameter between two study periods, urban and transitional (Tukey HSD test, p ≤ 0.05).
| Parameter | Sampling site | Period, years | ||
|---|---|---|---|---|
|
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| Transitional | Urban | |||
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| 2001–2002 | 2007 | 2014–2015 | ||
| Organic carbon (% DW) | Shallow part | 12.3 ± 1.6 | 12.0 ± 1.0 | 15.8 ± 0.3* |
| Deep part | 8.8 ± 0.7 | 12.0 ± 0.5* | 16.3 ± 1.9* | |
| Sulfates (mg dm−3) | Shallow part | 33.7 ± 2.2 | 39.0 ± 0.0 | 36.6 ± 1.3 |
| Deep part | 28.9 ± 3.0 | 40.5 ± 2.3* | 36.0 ± 0.2 | |
| Hydrogen sulfide (mg dm−3) | Shallow part | 112 ± 16 | 272 ± 2* | 260 ± 14* |
| Deep part | 164 ± 4 | 480 ± 23* | 524 ± 44* | |
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