Isotopic composition of nitrate-nitrogen as a marker of riparian and benthic denitrification at the scale of the whole Seine River system.
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| Title: | Isotopic composition of nitrate-nitrogen as a marker of riparian and benthic denitrification at the scale of the whole Seine River system. |
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| Authors: | Sebilo, Mathieu1,2 mathieu.sebilo@ccr.jussieu.fr, Billen, Gilles2, Grably, Micheline1, Mariotti, André1 |
| Source: | Biogeochemistry. Apr2003, Vol. 63 Issue 1, p35-51. 17p. |
| Subjects: | Nitrogen, Nitrogen compounds, Denitrification, Riparian ecology, Agricultural engineering, Biogeochemistry |
| Abstract: | Nitrogen budgets established for large river systems reveal that up to 60% of the nitrate exported from agricultural soils is eliminated, either when crossing riparian wetlands areas before even reaching surface waters, or within the rivers themselves through benthic denitrification. The study of nitrogen isotope ratios of riverine nitrates could offer an elegant means to assess the extent of denitrification and thus confirm these budgets, as it is known that denitrification results in a natural 15N enrichment of residual nitrates. The results reported here, for the Seine river system (France), demonstrate the feasibility of this isotopic approach at the scale of large watersheds. On the basis of in situ observations carried out in a large storage reservoir in the upstream Seine catchment (Der Lake), where intensive benthic denitrification occurs, as well as on the basis of laboratory experiments of denitrification under controlled conditions, it is shown that the isotopic discrimination associated with benthic denitrification is minimal (ℇ of NO3-N ranging from -1.5 to -3.6‰), probably because the rate-limiting step of the process consists of nitrate diffusion through the water-sediment interface. Riparian denitrification on the contrary, when it implies nitrate reduction during convective transfer through reducing environements, causes a much more significant isotopic enrichment of 15N of residual nitrate (ℇ about -18‰). The authors report measurements of nitrogen isotopic composition of nitrate from rivers of various stream orders in the Seine river system under summer conditions. Anomalies in the data with respect to the values expected from the mixture of the various sources of nitrate are here attributed to riparian denitrification. However, the authors show that because of the patchy distribution of actively denitrifying riparian zones within the drainage network, the isotopic signature conferred to residual nitrate in river water intrinsically provides only a minimum estimate of the extent of denitrification. [ABSTRACT FROM AUTHOR] |
| Copyright of Biogeochemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Isotopic composition of nitrate-nitrogen as a marker of riparian and benthic denitrification at the scale of the whole Seine River system. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sebilo%2C+Mathieu%22">Sebilo, Mathieu</searchLink><relatesTo>1,2</relatesTo><i> mathieu.sebilo@ccr.jussieu.fr</i><br /><searchLink fieldCode="AR" term="%22Billen%2C+Gilles%22">Billen, Gilles</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Grably%2C+Micheline%22">Grably, Micheline</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mariotti%2C+André%22">Mariotti, André</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Biogeochemistry%22">Biogeochemistry</searchLink>. Apr2003, Vol. 63 Issue 1, p35-51. 17p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Nitrogen%22">Nitrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen+compounds%22">Nitrogen compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Denitrification%22">Denitrification</searchLink><br /><searchLink fieldCode="DE" term="%22Riparian+ecology%22">Riparian ecology</searchLink><br /><searchLink fieldCode="DE" term="%22Agricultural+engineering%22">Agricultural engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Biogeochemistry%22">Biogeochemistry</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Nitrogen budgets established for large river systems reveal that up to 60% of the nitrate exported from agricultural soils is eliminated, either when crossing riparian wetlands areas before even reaching surface waters, or within the rivers themselves through benthic denitrification. The study of nitrogen isotope ratios of riverine nitrates could offer an elegant means to assess the extent of denitrification and thus confirm these budgets, as it is known that denitrification results in a natural 15N enrichment of residual nitrates. The results reported here, for the Seine river system (France), demonstrate the feasibility of this isotopic approach at the scale of large watersheds. On the basis of in situ observations carried out in a large storage reservoir in the upstream Seine catchment (Der Lake), where intensive benthic denitrification occurs, as well as on the basis of laboratory experiments of denitrification under controlled conditions, it is shown that the isotopic discrimination associated with benthic denitrification is minimal (ℇ of NO3-N ranging from -1.5 to -3.6‰), probably because the rate-limiting step of the process consists of nitrate diffusion through the water-sediment interface. Riparian denitrification on the contrary, when it implies nitrate reduction during convective transfer through reducing environements, causes a much more significant isotopic enrichment of 15N of residual nitrate (ℇ about -18‰). The authors report measurements of nitrogen isotopic composition of nitrate from rivers of various stream orders in the Seine river system under summer conditions. Anomalies in the data with respect to the values expected from the mixture of the various sources of nitrate are here attributed to riparian denitrification. However, the authors show that because of the patchy distribution of actively denitrifying riparian zones within the drainage network, the isotopic signature conferred to residual nitrate in river water intrinsically provides only a minimum estimate of the extent of denitrification. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Biogeochemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1023/A:1023362923881 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 35 Subjects: – SubjectFull: Nitrogen Type: general – SubjectFull: Nitrogen compounds Type: general – SubjectFull: Denitrification Type: general – SubjectFull: Riparian ecology Type: general – SubjectFull: Agricultural engineering Type: general – SubjectFull: Biogeochemistry Type: general Titles: – TitleFull: Isotopic composition of nitrate-nitrogen as a marker of riparian and benthic denitrification at the scale of the whole Seine River system. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sebilo, Mathieu – PersonEntity: Name: NameFull: Billen, Gilles – PersonEntity: Name: NameFull: Grably, Micheline – PersonEntity: Name: NameFull: Mariotti, André IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 01682563 Numbering: – Type: volume Value: 63 – Type: issue Value: 1 Titles: – TitleFull: Biogeochemistry Type: main |
| ResultId | 1 |
