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2. The information system of the French Peatland Observation Service: Service National d'Observation Tourbières – A valuable tool to assess the impact of global changes on the hydrology and biogeochemistry of temperate peatlands through long term monitoring

Author

Gogo, Sébastien, primary, Paroissien, Jean‐Baptiste, additional, Laggoun‐Défarge, Fatima, additional, Antoine, Jean‐Marc, additional, Bernard‐Jannin, Léonard, additional, Bertrand, Guillaume, additional, Binet, Philippe, additional, Binet, Stéphane, additional, Bouger, Guillaume, additional, Brossard, Yohann, additional, Camboulive, Thierry, additional, Caudal, Jean‐Pierre, additional, Chevrier, Stéphane, additional, Chiapiuso, Geneviève, additional, D'Angelo, Benoît, additional, Durantez, Pilar, additional, Flechard, Chris, additional, Francez, André‐Jean, additional, Galop, Didier, additional, Gandois, Laure, additional, Gilbert, Daniel, additional, Guimbaud, Christophe, additional, Hinault, Louis, additional, Jacotot, Adrien, additional, Le Moing, Franck, additional, Lerigoleur, Emilie, additional, Le Roux, Gaël, additional, Leroy, Fabien, additional, Lhosmot, Alexandre, additional, Li, Qian, additional, Machado Da Silva, Elodie, additional, Moquet, Jean‐Sébastien, additional, Mora‐Gomez, Juanita, additional, Perdereau, Laurent, additional, Rosset, Thomas, additional, and Toussaint, Marie‐Laure, additional

Published
2021
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3. High frequency measurements of CO2 and CH4 fluxes in a temperate peatland dominated by Molinia caerulea (La Guette, France)

Author

Jacotot, Adrien, Gogo, Sébastien, Perdereau, Laurent, Paroissien, Jean-Baptiste, Guimbaud, Christophe, Laggoun-Défarge, Fatima, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), and Jacotot, Adrien

Subjects
Greenhouse gas GHG, [SDE.MCG] Environmental Sciences/Global Changes, Peatland, [SDE.MCG]Environmental Sciences/Global Changes, Eddy-covariance, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

International audience; Peatlands act as a powerful carbon (C) sink. This specificity results from their particular environment, composed of Shagnum mosses, and the acidic state of the soil combined with a high water saturation that strongly limit organic matter decomposition. Future natural and anthropogenic global changes are expected to modify peatlands functioning and their species composition, which could reverse their valuable role in C sequestration and thus in climate change mitigation. However, the response of peatlands to these biotic changes, and thus the variability of greenhouse gas fluxes, remains poorly characterized and understood. We investigated CO2 and CH4 emissions in the La Guette peatland, an acidic fen located in the center of France, thanks to an Eddy-covariance station that was installed in the ecosystem in early 2017. In addition, this site is applying for the ICOS network labelling as an associated site, and follows the ICOS recommendations. Our main concern is that La Guette peatland is submitted to a strong domination by a herbaceous plant, Molinia caerulea, and a ericaceous shrub, Erica tetralix, which are suspected to modify the C dynamic of the ecosystem. From January 2017 to September 2019, CO2 and CH4 fluxes to the atmosphere ranged from to -19.46 to 19.73 µmol m-2 s-1 and from -0.12 to 0.42 µmol m-2 s-1, respectively. Mean CO2 flux for 2017, 2018 and 2019 were respectively 1.13, 1.08 and 0.44 µmol m-2 s-1. Carbon balance of the ecosystem since the beginning of 2017 has been evaluated to 982 gC m-², suggesting that the peatland acted as a source of C over these three last years. In a larger scale, this Eddy covariance station is a part of a French Peatland Observatory Service, and is included in a network of three tower fluxes deployed in three contrasted French peatlands. In the long term, this Eddy-covariance network will provide important data that will help to understand the evolution of the C balance in temperate peatlands with global changes.

Published
2019

4. High frequency measurements of CO2 and CH4 in a temperate peatland dominated by Molinia caerulea (La Guette, France)

Author

Jacotot, Adrien, Gogo, Sébastien, Perdereau, Laurent, Paroissien, Jean-Baptiste, Guimbaud, Christophe, Laggoun-Défarge, Fatima, Biogéosystèmes Continentaux - UMR7327, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), SNO-Tourbières, and Jacotot, Adrien

Subjects
[SDE.MCG] Environmental Sciences/Global Changes, [SDE.MCG]Environmental Sciences/Global Changes, Eddy-covariance, Peatlands, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Greenhouse gas, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

International audience; Peatlands act as a powerful carbon (C) sink. This specificity results from their particular environment, composed of Shagnum mosses, and the acidic state of the soil combined with a high water saturation that strongly limit organic matter decomposition. Future natural and anthropogenic global changes are expected to modify peatlands functioning and their species composition, which could reverse their valuable role in C sequestration and thus in climate change mitigation. However, the response of peatlands to these biotic changes, and thus the variability of greenhouse gas fluxes, remains poorly characterized and understood. We investigated CO2 and CH4 emissions in the La Guette peatland, an acidic fen located in the center of France, thanks to an Eddy-covariance station that was installed in the ecosystem in early 2017. In addition, this site is applying for the ICOS network labelling as an associated site, and follows the ICOS recommendations. Our main concern is that La Guette peatland is submitted to a strong domination by a herbaceous plant, Molinia caerulea, and a ericaceous shrub, Erica tetralix, which are suspected to modify the C dynamic of the ecosystem. From January 2017 to September 2019, CO2 and CH4 fluxes to the atmosphere ranged from to -19.46 to 19.73 µmol m-2 s-1 and from -0.12 to 0.42 µmol m-2 s-1, respectively. Mean CO2 flux for 2017, 2018 and 2019 were respectively 1.13, 1.08 and 0.44 µmol m-2 s-1. Carbon balance of the ecosystem since the beginning of 2017 has been evaluated to 982 gC m-², suggesting that the peatland acted as a source of C over these three last years. In a larger scale, this Eddy covariance station is a part of a French Peatland Observatory Service, and is included in a network of three tower fluxes deployed in three contrasted French peatlands. In the long term, this Eddy-covariance network will provide important data that will help to understand the evolution of the C balance in temperate peatlands with global changes.

Published
2019

7. Two-years of Eddy-covariance CO2 and CH4 measurements in a French peatland dominated Molinia caerulea

Author

Jacotot, Adrien, Gogo, Sébastien, Perdereau, Laurent, Guimbaud, Christophe, Chevrier, Stéphane, Laggoun-Défarge, Fatima, Jacotot, Adrien, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), and SNO-Tourbières

Subjects
[SDE.MCG] Environmental Sciences/Global Changes, Peatland, [SDE.MCG]Environmental Sciences/Global Changes, Eddy-covariance, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

International audience; Peatlands act as a powerful carbon (C) sink. This specificity notably results from their particular environment, composed of Shagnum mosses, and the acidic state of the soil combined with a high water saturation that strongly limit organic matter decomposition. Future natural and anthropogenic global changes are expected to modify peatlands functioning and notably their species composition, which could reverse their valuable role in C sequestration and thus in climate change mitigation. However, the response of peatlands to these biotic changes, and thus the variability of greenhouse gas fluxes, remains poorly characterized and understood. We investigated CO2 and CH4 emissions in the La Guette peatland, an acidic fen located in the center of France, thanks to an Eddy-covariance station that was installed in the ecosystem in early 2017. In addition, this site is applying for the ICOS network labelling as an associated site, and follows the ICOS recommendations. Our main concern is that La Guette peatland is submitted to a strong domination by a grass plant, Molinia caerulea, which is suspected to modify the C dynamic of the ecosystem. From January 2017 to date, CO2 and CH4 fluxes to the atmosphere ranged from to -19.46 to 19.73 µmol m-2 s-1 and from -0.10 to 0.10 µmol m-2 s-1, respectively. Mean CO2 flux for 2017 and 2018 were respectively ~ -0.21 and ~ -0.89 µmol m-2 s-1, showing that La Guette peatland acted as a sink of C over these two years. This result suggests that Molinia caerulea did not reverse the C sequestration potential of the fen. In a larger scale, this Eddy-covariance station is a part of a French Peatland Observatory Service, and is included in a network of three tower fluxes deployed in three contrasted French peatlands. This Eddy-covariance network will provide important data that will help to understand the evolution of the C balance in temperate peatlands with global changes.

Published
2019

9. Hydrological control of dissolved organic carbon dynamics in a rehabilitated Sphagnum-dominated peatland: a water-table based modelling approach

Author

Bernard-Jannin, Léonard, Binet, Stéphane, Gogo, Sébastien, Leroy, Fabien, Défarge, Christian, Jozja, Nevila, Zocatelli, Renata, Perdereau, Laurent, Laggoun-Défarge, Fatima, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), CETRAHE, Université d'Orléans (UO), PIVOTSSNO Tourbières CNRS-INSU, SNO-Tourbières, ANR-10-LABX-0100,VOLTAIRE,Geofluids and Volatil elements – Earth, Atmosphere, Interfaces – Resources and Environment(2010), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU]Sciences of the Universe [physics], [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

Hydrological disturbances could increase dissolved organic carbon (DOC) exports through changes in runoff and leaching, which reduces the potential carbon sink function of peatlands. The objective of this study was to assess the impact of hydrological restoration on hydrological processes and DOC dynamics in a rehabilitated Sphagnum-dominated peatland. A conceptual hydrological model calibrated on the water table and coupled with a biogeochemical module was applied to La Guette peatland (France), which experienced a rewetting initiative on February 2014. The model (eight calibrated parameters) reproduced water-table (0.1

Published
2018

10. Modelling dissolved organic carbon dynamics in a rehabilitated Sphagnum-dominated peatland

Author

Bernard-Jannin, Léonard, Binet, Stéphane, Gogo, Sébastien, Leroy, Fabien, Perdereau, Laurent, Laggoun-Défarge, Fatima, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), PIVOTS, and ANR-10-LABX-0100,VOLTAIRE,Geofluids and Volatil elements – Earth, Atmosphere, Interfaces – Resources and Environment(2010)

Subjects
[SDU]Sciences of the Universe [physics], [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

International audience; Sphagnum-dominated peatlands represent a major stock of the global soil carbon (C) pool (Gorham, 1991). Dissolved organic carbon (DOC) exports through runoff and leaching could reduce their potential C storage function (Billett et al., 2004) and impact downstream water quality (Ritson et al., 2014). DOC dynamics in peatlands is strongly controlled by site hydrology, especially by water table depth (WTD), and disturbances such as drainage can lead to increased DOC export (Strack et al., 2008). In addition, hydrological restoration (e.g. rewetting) can be undertaken to restore peatland functioning with a potential impact on DOC dynamic and export.While changes in DOC net production resulting from WTD drawdown can be assessed through field studies, the contribution of DOC production and consumption are more difficult to evaluate (Strack et al., 2008). In this case, process-based biogeochemical models simulating DOC dynamics combined with hydrological models adapted to peatlands specific settings are relevant tools to study factors controlling DOC production and consumption in such environments.In this study a module simulating DOC production and consumption was added to an existing WTD dependent hydrological model. The model was applied to two sites of a peatland, one of them having experienced rewetting. The objective is to identify factors controlling DOC dynamics and to assess the impact of rewetting on DOC export in a Sphagnum-dominated peatland.

Published
2017

11. Modelling hydrological processes and dissolved organic carbon dynamics in a rehabilitated Sphagnum-dominated peatland

Author

Bernard-Jannin, Léonard, Binet, Stéphane, Gogo, Sébastien, Leroy, Fabien, Perdereau, Laurent, Laggoun-Défarge, Fatima, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), and SNO-TourbièresPIVOTS

Subjects
[SDU]Sciences of the Universe [physics], [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

International audience; Sphagnum-dominated peatlands represent a global major stock of carbon (C). Dissolved organic carbon (DOC) exports through runoff and leaching could reduce their potential C sink function and impact downstream water quality. DOC production in peatlands is strongly controlled by the hydrology, especially water table depth (WTD). Therefore, disturbances such as drainage can lead to increase DOC exports by lowering the WTD. Hydrological restoration (e.g. rewetting) can be undertaken to restore peatland functioning with an impact on DOC exports. The objective of this study is to assess the impact of drainage and rewetting on hydrological processes and their interactions with DOC dynamics in a Sphagnum dominated peatland. A hydrological model has been applied to a drained peatland (La Guette, France) which experienced a rewetting action on February 2014 and where WTD has been recorded in four piezometers at a 15 min time step since 2009. In addition, DOC concentrations in the peatland have been measured 6 times a year since 2014. The hydrological model is a WTD dependent reservoir model composed by two reservoirs representing the micro and macro porosity of the peatland (Binet et al., 2013). A DOC production module in both reservoirs was implemented based on temperature and WTD. The model was calibrated against WTD and DOC concentrations for each piezometer. The results show that the WTD in the study area is strongly affected by local meteorological conditions that could hide the effect of the rewetting action. The preliminary results evidenced that an additional source of water, identified as groundwater supply originating from the surrounding sandy layer aquifer, is necessary to maintain the water balance, especially during wet years (NS>0.8). Finally, the DOC module was able to describe DOC concentrations measured in the peatland and could be used to assess the impact of rewetting on DOC dynamics at different locations and to identify the factors of control of DOC exports at the peatland scale before and after the restoration. This simple conceptual model requires few data to operate. Its application on different sites with contrasted settings (hydrological and climatic conditions) could provide insight on the dominant hydrological processes and their impact on DOC dynamics in peatlands. Binet S., Gogo S., Laggoun-Défarge F., A water-table dependent reservoir model to investigate the effect of drought and vascular plant invasion on peatland hydrology, Journal of Hydrology, Volume 499, 30 August 2013, Pages 132-139, ISSN 0022-1694, http://dx.doi.org/10.1016/j.jhydrol.2013.06.035.

Published
2017

12. Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>-dominated peatland: a water-table based modelling approach

Author

Bernard-Jannin, Léonard, primary, Binet, Stéphane, additional, Gogo, Sébastien, additional, Leroy, Fabien, additional, Défarge, Christian, additional, Jozja, Nevila, additional, Zocatelli, Renata, additional, Perdereau, Laurent, additional, and Laggoun-Défarge, Fatima, additional

Published
2018
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13. Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>–dominated peatland: a water-table based modelling approach

Author

Bernard-Jannin, Léonard, primary, Binet, Stéphane, additional, Gogo, Sébastien, additional, Leroy, Fabien, additional, Défarge, Christian, additional, Jozja, Nevila, additional, Zocatelli, Renata, additional, Perdereau, Laurent, additional, and Laggoun-Défarge, Fatima, additional

Published
2017
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14. Hydrological control of dissolved organic carbon dynamics in a rehabilitated Sphagnum-dominated peatland: a water-table based modelling approach.

Author

Bernard-Jannin, Léonard, Binet, Stéphane, Gogo, Sébastien, Leroy, Fabien, Défarge, Christian, Jozja, Nevila, Zocatelli, Renata, Perdereau, Laurent, and Laggoun-Défarge, Fatima

Abstract

Hydrological disturbances could increase dissolved organic carbon (DOC) exports through runoff and leaching, reducing the potential carbon sink function of peatlands. The objective of this study was to assess the impact of hydrological restoration on hydrological processes and DOC dynamics in a rehabilitated Sphagnum-dominated peatland. A conceptual hydrological model calibrated on the water table and coupled with a biogeochemical module was applied to La Guette peatland (France), which experienced a rewetting action on February 2014. The model (ten calibrated parameters) reproduced water table and pore water DOC concentration time series (01/04/2014 to 15/07/2017) in two contrasted locations (rewetted and control) of the peatland. Hydrological restoration was found to impact the water balance through a decrease in slow deep drainage and an increase in fast superficial runoff. Observed DOC concentrations were higher in summer in the rewetted location compared to the control and were linked with a difference in dissolved organic matter composition analyzed by fluorescence. Hydrological conditions, especially the severity of the water table drawdown, were identified as the major factors controlling DOC concentration dynamics. The results of the simulation suggest that the hydrological restoration did not affect DOC loads, at least on a short-term period (3 years). However, it impacted the temporal dynamics of DOC exports, which were the most episodic and mainly transported through fast surface runoff in the area affected by the restoration while slow deep drainage dominated DOC exports in the control area. In relation with dominant hydrological processes, exported DOC is expected to be derived from more recent organic matter of the top peat layer in the rewetted area than in the control area. Since it is calibrated on water table and DOC concentration, the model presented in this study proved to be a relevant tool to identify the main hydrological processes and factors controlling DOC dynamics in different areas of the same peatland. It is also a suitable alternative to a discharge calibrated catchment model when the outlet is not easily identifiable. [ABSTRACT FROM AUTHOR]

Published
2017
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15. Evolution des paléoenvironnements alpins durant l'âge du Bronze: apports des archives littorales et profondes du lac du Bourget (Savoie, France)

Author

Chapron, Emmanuel, Arnaud, Fabien, Marguet, A., Billaud, Y., Perdereau, Laurent, Magny, Michel, Laboratoire Chrono-environnement ( LCE ), Université Bourgogne Franche-Comté ( UBFC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Franche-Comté ( UFC ), Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences, [ SDU.STU ] Sciences of the Universe [physics]/Earth Sciences
Published
2007

16. Evolution des paléoenvironnements Alpins durant l'Age du Bronze : apports des archives sédimentaires littorales et profondes du Lac du Bourget (Savoie, France)

Author

Arnaud, Fabien, Chapron, Emmanuel, Marguet, A., Billaud, Yves, Perdereau, Laurent, Magny, Michel, Arnaud, Fabien, Processus et bilan des domaines sédimentaires (PBDS), Université de Lille, Sciences et Technologies-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Geological Institute [ETH Zürich], Department of Earth Sciences [Swiss Federal Institute of Technology - ETH Zürich] (D-ERDW), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Département des Recherches Archéologiques Subaquatiques et Sous-Marines [Marseille] (DRASSM), Ministère de la Culture (MC), Laboratoire de chrono-écologie - CNRS (UMR6565) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
[SDE.MCG] Environmental Sciences/Global Changes, [SDE.MCG.SIC]Environmental Sciences/Global Changes/domain_sde.mcg.sic, [SDE.MCG]Environmental Sciences/Global Changes, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment, [SDE.MCG.SIC] Environmental Sciences/Global Changes/domain_sde.mcg.sic
Published
2007

17. Evolution paléoenvironnements Alpins durant l'Age de Bronze : apports des archives sédimentaires littorales et profondes du Lac du Bourget (Savoie, France)

Author

Chapron, Emmanuel, Arnaud, Fabien, Marguet, A., Billaud, Yves, Perdereau, Laurent, Magny, M., Renard Centre of Marine Geology, University of Gent, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), and Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
Age du Bronze, [SDE.MCG]Environmental Sciences/Global Changes, Lac du Bourget, France, Savoie, [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology, ComputingMilieux_MISCELLANEOUS, archives sédimentaires, paléoenvironnements Alpins
Abstract

International audience

Published
2005

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