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A year-long study was conducted in Taihu Lake with the objective of investigate the diffusive fluxes of methane（CH4）across the sediment-water interface in different ecological zones, namely the algal bloom zone, the macrophyte zone, and the open water zone. The CH4 concentrations in the sediment porewaters and the relevant fluxes at the sediment-water interface from different ecological zones of the lake were analyzed and evaluated. Results showed that CH4 concentrations in porewaters increased with the sediment depth. The CH4 concentrations in the open water zone were found significantly lower than that in the other zones. The organic carbon was identified as the key factor driving the spatial and temporal variations of CH4. The mean diffusive fluxes of CH4 across the sediment-water interface were 122.56±32.2, 108.75±23.8, and 3.36±0.6 µmol/（m2·d）in the algal bloom zone, the macrophyte zone, and the open water zone, respectively, with the open water zone showing the significantly lower fluxes. Seasonal variations of CH4 fluxes were observed in the lake while the fluxes were significantly higher in the spring and the summer than the other two seasons. The regression result showed that the CH4 flux was strongly influenced by the CH4 concentration in the porewater and the sediment porosity. Our study also demonstrated that algal blooms and macrophyte reproductions enhanced CH4 concentrations in porewaters and significantly increased the diffusive CH4 fluxes across the sediment-water interface in Lake Taihu.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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