Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed
International audience The isotopic signature of Dissolved Inorganic Carbon (DIC), δ13CDIC, has been investigated in the surface waters of a small agricultural catchment on calcareous substratum, Montoussé, located at Auradé (south‐west France). The Montoussé catchment is subjected to intense farmin...
Published in: | Rapid Communications in Mass Spectrometry |
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Main Authors: | , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://hal.science/hal-03472105 https://hal.science/hal-03472105/document https://hal.science/hal-03472105/file/Brunet_5418.pdf https://doi.org/10.1002/rcm.5050 |
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openpolar |
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Open Polar |
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Météo-France: HAL |
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ftmeteofrance |
language |
English |
topic |
Carbone 13 Stream waters Weathering Watershed Dissolved inorganic carbon Nitrogenous-fertilizers [CHIM.GENI]Chemical Sciences/Chemical engineering [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
Carbone 13 Stream waters Weathering Watershed Dissolved inorganic carbon Nitrogenous-fertilizers [CHIM.GENI]Chemical Sciences/Chemical engineering [SDE.BE]Environmental Sciences/Biodiversity and Ecology Brunet, Frédéric Potot, Cécile Probst, Anne Probst, Jean-Luc Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed |
topic_facet |
Carbone 13 Stream waters Weathering Watershed Dissolved inorganic carbon Nitrogenous-fertilizers [CHIM.GENI]Chemical Sciences/Chemical engineering [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience The isotopic signature of Dissolved Inorganic Carbon (DIC), δ13CDIC, has been investigated in the surface waters of a small agricultural catchment on calcareous substratum, Montoussé, located at Auradé (south‐west France). The Montoussé catchment is subjected to intense farming (wheat/sunflower rotation) and a moderated application of nitrogenous fertilizers. During the nitrification of the NH4 +, supplied by fertilization, nitrate and H+ ions are produced in the soil. This anthropogenic acidity is combined with the natural acidity due to carbonic acid in weathering processes. From an isotopic point of view, with ’natural weathering’, using carbonic acid, δ13CDIC is intermediate between the δ13C of soil CO2 produced by organic matter oxidation and that of the carbonate rocks, while it has the same value as the carbonates when carbonic acid is substituted by another acid like nitric acid derived from nitrogen fertilizer. The δ13CDIC values range from −17.1‰ to −10.7‰ in Montoussé stream waters. We also measured the δ13C of calcareous molassic deposits (average −7.9‰) and of soil organic carbon (between −24.1‰ and −26‰) to identify the different sources of DIC and to estimate their contribution. The δ13CDIC value indicates that weathering largely follows the carbonic acid pathway at the springs (sources of the stream). At the outlet of the basin, H+ ions, produced during the nitrification of N‐fertilizer, also contribute to weathering, especially during flood events. This result is illustrated by the relationship between δ13CDIC and the molar ratio NO3 –/(Ca2+ + Mg2+). Consequently, when the contribution of nitrate increases, the δ13CDIC increases towards the calcareous end‐member. This new isotopic result provides evidence for the direct influence of nitrogen fertilizer inputs on weathering, CO2 consumption and base cation leaching and confirms previous results obtained using the chemistry of the major ions present in the field, and in soil column experiments. |
author2 |
Laboratoire Ecologie Fonctionnelle et Environnement (LEFE) Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) 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) |
format |
Article in Journal/Newspaper |
author |
Brunet, Frédéric Potot, Cécile Probst, Anne Probst, Jean-Luc |
author_facet |
Brunet, Frédéric Potot, Cécile Probst, Anne Probst, Jean-Luc |
author_sort |
Brunet, Frédéric |
title |
Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed |
title_short |
Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed |
title_full |
Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed |
title_fullStr |
Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed |
title_full_unstemmed |
Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed |
title_sort |
stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-03472105 https://hal.science/hal-03472105/document https://hal.science/hal-03472105/file/Brunet_5418.pdf https://doi.org/10.1002/rcm.5050 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
ISSN: 0951-4198 EISSN: 1097-0231 Rapid Communications in Mass Spectrometry https://hal.science/hal-03472105 Rapid Communications in Mass Spectrometry, 2011, 25 (19), pp.2682-2690. ⟨10.1002/rcm.5050⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/rcm.5050 hal-03472105 https://hal.science/hal-03472105 https://hal.science/hal-03472105/document https://hal.science/hal-03472105/file/Brunet_5418.pdf doi:10.1002/rcm.5050 OATAO: 5418 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/rcm.5050 |
container_title |
Rapid Communications in Mass Spectrometry |
container_volume |
25 |
container_issue |
19 |
container_start_page |
2682 |
op_container_end_page |
2690 |
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1810438716847554560 |
spelling |
ftmeteofrance:oai:HAL:hal-03472105v1 2024-09-15T18:01:36+00:00 Stable carbon isotope evidence for nitrogenous fertilizer impact on carbonate weathering in a small agricultural watershed Brunet, Frédéric Potot, Cécile Probst, Anne Probst, Jean-Luc Laboratoire Ecologie Fonctionnelle et Environnement (LEFE) Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) 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) 2011-10-15 https://hal.science/hal-03472105 https://hal.science/hal-03472105/document https://hal.science/hal-03472105/file/Brunet_5418.pdf https://doi.org/10.1002/rcm.5050 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/rcm.5050 hal-03472105 https://hal.science/hal-03472105 https://hal.science/hal-03472105/document https://hal.science/hal-03472105/file/Brunet_5418.pdf doi:10.1002/rcm.5050 OATAO: 5418 info:eu-repo/semantics/OpenAccess ISSN: 0951-4198 EISSN: 1097-0231 Rapid Communications in Mass Spectrometry https://hal.science/hal-03472105 Rapid Communications in Mass Spectrometry, 2011, 25 (19), pp.2682-2690. ⟨10.1002/rcm.5050⟩ Carbone 13 Stream waters Weathering Watershed Dissolved inorganic carbon Nitrogenous-fertilizers [CHIM.GENI]Chemical Sciences/Chemical engineering [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2011 ftmeteofrance https://doi.org/10.1002/rcm.5050 2024-06-25T00:11:05Z International audience The isotopic signature of Dissolved Inorganic Carbon (DIC), δ13CDIC, has been investigated in the surface waters of a small agricultural catchment on calcareous substratum, Montoussé, located at Auradé (south‐west France). The Montoussé catchment is subjected to intense farming (wheat/sunflower rotation) and a moderated application of nitrogenous fertilizers. During the nitrification of the NH4 +, supplied by fertilization, nitrate and H+ ions are produced in the soil. This anthropogenic acidity is combined with the natural acidity due to carbonic acid in weathering processes. From an isotopic point of view, with ’natural weathering’, using carbonic acid, δ13CDIC is intermediate between the δ13C of soil CO2 produced by organic matter oxidation and that of the carbonate rocks, while it has the same value as the carbonates when carbonic acid is substituted by another acid like nitric acid derived from nitrogen fertilizer. The δ13CDIC values range from −17.1‰ to −10.7‰ in Montoussé stream waters. We also measured the δ13C of calcareous molassic deposits (average −7.9‰) and of soil organic carbon (between −24.1‰ and −26‰) to identify the different sources of DIC and to estimate their contribution. The δ13CDIC value indicates that weathering largely follows the carbonic acid pathway at the springs (sources of the stream). At the outlet of the basin, H+ ions, produced during the nitrification of N‐fertilizer, also contribute to weathering, especially during flood events. This result is illustrated by the relationship between δ13CDIC and the molar ratio NO3 –/(Ca2+ + Mg2+). Consequently, when the contribution of nitrate increases, the δ13CDIC increases towards the calcareous end‐member. This new isotopic result provides evidence for the direct influence of nitrogen fertilizer inputs on weathering, CO2 consumption and base cation leaching and confirms previous results obtained using the chemistry of the major ions present in the field, and in soil column experiments. Article in Journal/Newspaper Carbonic acid Météo-France: HAL Rapid Communications in Mass Spectrometry 25 19 2682 2690 |