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Atmospheric CO.sub.2 exchanges measured by eddy covariance over a temperate salt marsh and influence of environmental controlling factors

Biogeosciences, 2024-02, Vol.21 (4), p.993 [Peer Reviewed Journal]

COPYRIGHT 2024 Copernicus GmbH ;ISSN: 1726-4170 ;EISSN: 1726-4189

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  • Title:
    Atmospheric CO.sub.2 exchanges measured by eddy covariance over a temperate salt marsh and influence of environmental controlling factors
  • Author: Mayen, Jérémy ; Polsenaere, Pierre ; Lamaud, Ãric ; Arnaud, Marie ; Kostyrka, Pierre ; Bonnefond, Jean-Marc ; Geairon, Philippe ; Gernigon, Julien ; Chassagne, Romain ; Lacoue-Labarthe, Thomas ; Regaudie de Gioux, Aurore ; Souchu, Philippe
  • Subjects: Environmental aspects ; Tidal marshes
  • Is Part Of: Biogeosciences, 2024-02, Vol.21 (4), p.993
  • Description: Within the coastal zone, salt marshes are atmospheric CO.sub.2 sinks and represent an essential component of biological carbon (C) stored on earth due to a strong primary production. Significant amounts of C are processed within these tidal systems which requires a better understanding of the temporal CO.sub.2 flux dynamics, the metabolic processes involved and the controlling factors. Within a temperate salt marsh (French Atlantic coast), continuous CO.sub.2 fluxes measurements were performed by the atmospheric eddy covariance technique to assess the net ecosystem exchange (NEE) at diurnal, tidal and seasonal scales as well as the associated relevant biophysical drivers. To study marsh metabolic processes, measured NEE was partitioned into gross primary production (GPP) and ecosystem respiration (R.sub.eco) during marsh emersion allowing to estimate NEE at the marsh-atmosphere interface (NEE.sub.marsh = GPP - R.sub.eco). During the year 2020, the net C balance from measured NEE was -483 g C m.sup.-2 yr.sup.-1 while GPP and R.sub.eco absorbed and emitted 1019 and 533 g C m.sup.-2 yr.sup.-1, respectively. The highest CO.sub.2 uptake was recorded in spring during the growing season for halophyte plants in relationships with favourable environmental conditions for photosynthesis, whereas in summer, higher temperatures and lower humidity rates increased ecosystem respiration. At the diurnal scale, the salt marsh was a CO.sub.2 sink during daytime, mainly driven by light, and a CO.sub.2 source during night-time, mainly driven by temperature, irrespective of emersion or immersion periods. However, daytime immersion strongly affected NEE fluxes by reducing marsh CO.sub.2 uptake up to 90 %. During night-time immersion, marsh CO.sub.2 emissions could be completely suppressed, even causing a change in metabolic status from source to sink under certain situations, especially in winter when R.sub.eco rates were lowest. At the annual scale, tidal immersion did not significantly affect the net C uptake of the studied salt marsh since similar annual balances of measured NEE (with tidal immersion) and estimated NEE.sub.marsh (without tidal immersion) were recorded.
  • Publisher: Copernicus GmbH
  • Language: English
  • Identifier: ISSN: 1726-4170
    EISSN: 1726-4189
  • Source: Directory of Open Access Journals
    ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
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