Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use
High flow events in headwater catchments are associated with changes in the dissolved organic matter (DOM) composition. The aim of this work was to determine whether these changes are characteristic of headwater catchments and similar to what has been observed in other catchments. The evolution of t...
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Académie des sciences
2024-11-01
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| Series: | Comptes Rendus. Géoscience |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.272/ |
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| author | Jeanneau, Laurent Fovet, Ophélie Faucheux, Mikaël Gruau, Gérard Liotaud, Marine Pierret, Marie-Claire Cotel, Solenn Molénat, Jérôme Lagacherie, Manon Dessert, Céline Probst, Anne |
| author_facet | Jeanneau, Laurent Fovet, Ophélie Faucheux, Mikaël Gruau, Gérard Liotaud, Marine Pierret, Marie-Claire Cotel, Solenn Molénat, Jérôme Lagacherie, Manon Dessert, Céline Probst, Anne |
| author_sort | Jeanneau, Laurent |
| collection | DOAJ |
| description | High flow events in headwater catchments are associated with changes in the dissolved organic matter (DOM) composition. The aim of this work was to determine whether these changes are characteristic of headwater catchments and similar to what has been observed in other catchments. The evolution of the DOM composition during flood events was studied for five catchments covering a range of climatic, soil and land use contexts. The DOM composition was analyzed by thermochemolysis coupled with gas chromatography and mass spectrometry, making it possible to perform a joint analysis of several biomolecule families, monitor the proportion of compounds derived from plant inputs (%VEG) and study the lignin composition through the C/V ratio. The %VEG increased for all flood events studied. As this parameter is linked to the aromaticity of DOM, these increases are in line with worldwide observations. However, observations of increases in DOM aromaticity during floods in tropical and arctic zones are few and contradictory. This observation seems to be a general feature of temperate climates. This increase in aromaticity was accompanied by an increase in the C/V ratio for all rainfall-related flood events, indicating the mobilization of less biodegraded dissolved lignins than during base flows. These observations are in line with those made in the United States of America and could be characteristic of headwater catchments. |
| format | Article |
| id | doaj-art-3fa091788bbf4e6c9b88779e681d7314 |
| institution | Kabale University |
| issn | 1778-7025 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj-art-3fa091788bbf4e6c9b88779e681d73142025-02-07T10:41:12ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252024-11-01356G115717510.5802/crgeos.27210.5802/crgeos.272Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land useJeanneau, Laurent0https://orcid.org/0000-0002-7588-0490Fovet, Ophélie1https://orcid.org/0000-0003-2359-000XFaucheux, Mikaël2Gruau, Gérard3https://orcid.org/0000-0003-3455-2738 Liotaud, Marine4Pierret, Marie-Claire5https://orcid.org/0000-0001-8434-9792Cotel, Solenn6Molénat, Jérôme7https://orcid.org/0000-0002-5957-0927 Lagacherie, Manon8Dessert, Céline9https://orcid.org/0000-0003-4468-2114Probst, Anne10https://orcid.org/0000-0002-4839-5908Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000 Rennes, FranceUMR SAS, INRAE, Institut Agro, 35000 Rennes, FranceUMR SAS, INRAE, Institut Agro, 35000 Rennes, FranceUniv Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000 Rennes, FranceUniv Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000 Rennes, FranceUniversité de Strasbourg, CNRS, EOST, ENGEES ITES UMR 7063, F-67000 Strasbourg, FranceUniversité de Strasbourg, CNRS, EOST, ENGEES ITES UMR 7063, F-67000 Strasbourg, FranceUMR LISAH, Univ. Montpellier, INRAE, IRD, Institut Agro, Montpellier, FranceUMR LISAH, Univ. Montpellier, INRAE, IRD, Institut Agro, Montpellier, FranceUniversité de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005 Paris, FranceCentre de Recherche sur la Biodiversité et l’Environnement (CRBE), Université de Toulouse, CNRS, IRD, Toulouse INP, Université Toulouse 3 – Paul Sabatier (UT3), Toulouse, FranceHigh flow events in headwater catchments are associated with changes in the dissolved organic matter (DOM) composition. The aim of this work was to determine whether these changes are characteristic of headwater catchments and similar to what has been observed in other catchments. The evolution of the DOM composition during flood events was studied for five catchments covering a range of climatic, soil and land use contexts. The DOM composition was analyzed by thermochemolysis coupled with gas chromatography and mass spectrometry, making it possible to perform a joint analysis of several biomolecule families, monitor the proportion of compounds derived from plant inputs (%VEG) and study the lignin composition through the C/V ratio. The %VEG increased for all flood events studied. As this parameter is linked to the aromaticity of DOM, these increases are in line with worldwide observations. However, observations of increases in DOM aromaticity during floods in tropical and arctic zones are few and contradictory. This observation seems to be a general feature of temperate climates. This increase in aromaticity was accompanied by an increase in the C/V ratio for all rainfall-related flood events, indicating the mobilization of less biodegraded dissolved lignins than during base flows. These observations are in line with those made in the United States of America and could be characteristic of headwater catchments.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.272/Dissolved organic matter (DOM)Flood eventsMolecular compositionLigninHeadwater catchmentsClimate gradient |
| spellingShingle | Jeanneau, Laurent Fovet, Ophélie Faucheux, Mikaël Gruau, Gérard Liotaud, Marine Pierret, Marie-Claire Cotel, Solenn Molénat, Jérôme Lagacherie, Manon Dessert, Céline Probst, Anne Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use Comptes Rendus. Géoscience Dissolved organic matter (DOM) Flood events Molecular composition Lignin Headwater catchments Climate gradient |
| title | Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use |
| title_full | Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use |
| title_fullStr | Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use |
| title_full_unstemmed | Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use |
| title_short | Compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use |
| title_sort | compositional changes of dissolved organic matter during high flow events in headwater catchments along a gradient of climate and land use |
| topic | Dissolved organic matter (DOM) Flood events Molecular composition Lignin Headwater catchments Climate gradient |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.272/ |
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