Spatial and temporal variations of methane diffusive fluxes across the sediment-water interface in Lake Taihu
DING Li-fei1,2, LI Tong2, WEI Wen-xin1,2, YAO En-qin3, ZHONG Ji-cheng2, YUAN He-zhong1, ZHANG Lei2
1. School of Environmental Science and Engineering, Nanjing University of Information Science &Technology, Nanjing 210044, China; 2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 3. Huzhou Municipal Bureau of Ecology and Environment, Zhejiang Province, Huzhou 313000, China
Abstract：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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