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• W4386968771 abstract "Within the coastal zone, salt marshes often behave as atmospheric CO2 sinks, allowing for blue carbon (C) sequestration associated with intense autotrophic metabolism. However, C dynamics over salt marshes are complex since various biogeochemical processes and fluxes occur at different terrestrial – aquatic – atmospheric exchange interfaces and spatiotemporal scales. This study focuses on seasonal, tidal and diurnal variations of water pCO 2, estimated water-air CO2 fluxes and controlling factors along two temperate shelf – estuary – marsh continuums. The latter include typical coastal systems with artificial salt marshes that have contrasting water management practices and primary producer types. Our high-frequency biogeochemical measurements (seasonal 24-hour cycles) highlighted a strong control of ecosystem typology on inorganic C dynamics with lower water pCO 2 values in the artificial salt marshes, due to stronger biological activity and longer water residence times, than in the tidal estuary. In the marine-dominated estuary, water pCO 2 variations (267 - 569 ppmv) were strongly controlled by tidal effects and phytoplankton activity particularly in spring/summer. On the contrary, the greatest amplitudes in water pCO 2 were recorded in the artificial salt marshes (6 - 721 ppmv) due to intense macrophyte activity. In the rewilded marsh, nutrient inputs favoured spring/summer fast-growing macroalgae produced, in turn, strong fall atmospheric CO2 outgassing from degraded algae waters and thus a net annual source of CO2 to the atmosphere (17.5 g C m−2 yr −1). Conversely, specific management practices at the working marsh for salt-farming activity favoured rather slow-growing macrophytes (i.e. seagrasses) which greatly contribute to the yearly observed atmospheric CO2 sink (-97.7 g C m−2 yr −1). In this work, we suggest that salt marsh management can be used to control the contribution of primary producers to marsh C budget as atmospheric CO2 (sink and/or source)." @default.
• W4386968771 created "2023-09-23" @default.
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• W4386968771 date "2023-12-01" @default.
• W4386968771 modified "2023-10-13" @default.
• W4386968771 title "Influence of typology and management practices on water pCO<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=d1e3116 altimg=si1.svg><mml:msub><mml:mrow /><mml:mrow><mml:mi mathvariant=bold>2</mml:mi></mml:mrow></mml:msub></mml:math> and atmospheric CO2 fluxes over two temperate shelf – estuary – marsh water continuums" @default.
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• W4386968771 doi "https://doi.org/10.1016/j.rsma.2023.103209" @default.
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