FN Archimer Export Format
PT J
TI Atmospheric CO2 exchanges measured by eddy covariance over a temperate salt marsh and influence of environmental controlling factors
BT 
AF Mayen, Jeremy
   Polsenaere, Pierre
   Lamaud, Éric
   Arnaud, Marie
   Kostyrka, Pierre
   Bonnefond, Jean-Marc
   Geairon, Philippe
   Gernigon, Julien
   Chassagne, Romain
   Lacoue-Labarthe, Thomas
   Regaudie de Gioux, Aurore
   Souchu, Philippe
AS 1:1,2;2:1;3:3;4:1,4;5:1;6:3;7:1;8:6;9:7;10:8;11:5;12:2;
FF 1:PDG-ODE-LITTORAL-LERMPL;2:PDG-ODE-LITTORAL-LERPC;3:;4:PDG-ODE-LITTORAL-LERPC;5:PDG-ODE-DYNECO-PELAGOS;6:;7:PDG-ODE-LITTORAL-LERPC;8:;9:;10:;11:PDG-ODE-DYNECO-PELAGOS;12:PDG-ODE-LITTORAL-LERMPL;
C1 IFREMER, Littoral, Laboratoire Environnement Ressources des Pertuis Charentais (LER/PC), BP 133, 17390 La Tremblade, France
   IFREMER, Littoral, Laboratoire Environnement Ressources Morbihan-Pays de Loire (LER/MPL), BP 21105, 44311 Nantes, France
   INRAE, Bordeaux Sciences Agro, ISPA, 33140 Villenave d’Ornon, France
   Institute of Ecology and Environmental Sciences Paris (iEES-Paris), Sorbonne University, 75005 Paris, France
   IFREMER, Dyneco, Pelagos, ZI de la Pointe du Diable – CS 10070, 29280 Plouzané, France
   LPO, Réserve Naturelle de Lilleau des Niges, 17880 Les Portes en Ré, France
   BRGM, 3 avenue Claude-Guillemin, BP 36009, 45060 Orléans, CEDEX 02, Orléans, France
   Littoral Environnement et Sociétés (LIENSs), UMR 7276, CNRS, La Rochelle Université, 2 Rue Olympe de Gouge, 17000 La Rochelle, France
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   INRAE, FRANCE
   UNIV SORBONNE, FRANCE
   IFREMER, FRANCE
   LPO, FRANCE
   BRGM, FRANCE
   UNIV LA ROCHELLE, FRANCE
SI NANTES
   LA TREMBLADE
   BREST
SE PDG-ODE-LITTORAL-LERMPL
   PDG-ODE-LITTORAL-LERPC
   PDG-ODE-DYNECO-PELAGOS
IN WOS Ifremer UPR
   DOAJ
   copubli-france
   copubli-p187
   copubli-univ-france
IF 4.9
TC 0
UR https://archimer.ifremer.fr/doc/00882/99396/109420.pdf
   https://archimer.ifremer.fr/doc/00882/99396/109421.pdf
   https://archimer.ifremer.fr/doc/00882/99396/109422.pdf
LA English
DT Article
AB Within the coastal zone, salt marshes are atmospheric CO2 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 CO2 flux dynamics, the metabolic processes involved and the controlling factors. Within a temperate salt marsh (French Atlantic coast), continuous CO2 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 (Reco) during marsh emersion allowing to estimate NEE at the marsh–atmosphere interface (NEEmarsh = GPP − Reco). During the year 2020, the net C balance from measured NEE was −483 g C m−2 yr−1 while GPP and Reco absorbed and emitted 1019 and 533 g C m−2 yr−1, respectively. The highest CO2 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 CO2 sink during daytime, mainly driven by light, and a CO2 source during night-time, mainly driven by temperature, irrespective of emersion or immersion periods. However, daytime immersion strongly affected NEE fluxes by reducing marsh CO2 uptake up to 90 %. During night-time immersion, marsh CO2 emissions could be completely suppressed, even causing a change in metabolic status from source to sink under certain situations, especially in winter when Reco 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 NEEmarsh (without tidal immersion) were recorded. 
PY 2024
PD FEB
SO Biogeosciences
SN 1726-4170
PU Copernicus GmbH
VL 21
IS 4
UT 001190532400001
BP 993
EP 1016
DI 10.5194/bg-21-993-2024
ID 99396
ER

EF