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W4283312935 abstract "Submerged macrophytes play a key role in maintaining clear vegetated states in shallow lakes, but their role on methane (CH 4 ) dynamics is less explored. They might enhance methanogenesis by providing organic matter but they can also supply oxygen to the sediments increasing methanotrophy. They may also affect gas exchange by diminishing wind turbulence in the water column. We previously measured seasonal CO 2 and CH 4 partial pressure ( p CO 2 and p CH 4 ) and diffusive fluxes from two clear vegetated and two turbid algal shallow lakes of the Pampean Plain, Argentina, and we reported that clear lakes had higher mean annual p CH 4 despite states having similar mean annual CH 4 diffusive flux. In this study we explore the contribution of physical and biological factors regulating surface p CH 4 . Mean annual CH 4 diffusive fluxes and CH 4 fraction of oxidation (F ox ) were similar between states, implying a comparable mean annual CH 4 input. k CH 4 was significantly higher than k CO 2, suggesting occurrence of CH 4 microbubbles, yet k CH 4 was higher in turbid lakes than in clear lakes, implying a higher microbubble formation in turbid lakes. Furthermore, in turbid lakes there were positive relationships between k and wind speed, and between k and p CH 4 , yet in clear lakes these relations were absent. Results suggest that submerged vegetation suppresses wind induced turbulence in clear vegetated lakes, decoupling k CH 4 from wind and reducing microbubble formation, therefore augmenting p CH 4 in their surface waters. Overall, physical rather than biological factors appear to control the observed differences in p CH 4 between states." @default.
W4283312935 created "2022-06-24" @default.
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W4283312935 date "2022-06-23" @default.
W4283312935 modified "2023-10-18" @default.
W4283312935 title "Physical Factors and Microbubble Formation Explain Differences in CH4 Dynamics Between Shallow Lakes Under Alternative States" @default.
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W4283312935 doi "https://doi.org/10.3389/fenvs.2022.892339" @default.
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