Improved isotopic model based on 15 N tracing and Rayleigh-type isotope fractionation for simulating differential sources of N2 O emissions in a clay grassland soil
© 2018 The Authors Rapid Communications in Mass Spectrometry Published by John Wiley & Sons, Ltd..
RATIONALE: Isotopic signatures of N2 O can help distinguish between two sources (fertiliser N or endogenous soil N) of N2 O emissions. The contribution of each source to N2 O emissions after N-application is difficult to determine. Here, isotopologue signatures of emitted N2 O are used in an improved isotopic model based on Rayleigh-type equations.
METHODS: The effects of a partial (33% of surface area, treatment 1c) or total (100% of surface area, treatment 3c) dispersal of N and C on gaseous emissions from denitrification were measured in a laboratory incubation system (DENIS) allowing simultaneous measurements of NO, N2 O, N2 and CO2 over a 12-day incubation period. To determine the source of N2 O emissions those results were combined with both the isotope ratio mass spectrometry analysis of the isotopocules of emitted N2 O and those from the 15 N-tracing technique.
RESULTS: The spatial dispersal of N and C significantly affected the quantity, but not the timing, of gas fluxes. Cumulative emissions are larger for treatment 3c than treatment 1c. The 15 N-enrichment analysis shows that initially ~70% of the emitted N2 O derived from the applied amendment followed by a constant decrease. The decrease in contribution of the fertiliser N-pool after an initial increase is sooner and larger for treatment 1c. The Rayleigh-type model applied to N2 O isotopocules data (δ15 Nbulk -N2 O values) shows poor agreement with the measurements for the original one-pool model for treatment 1c; the two-pool models gives better results when using a third-order polynomial equation. In contrast, in treatment 3c little difference is observed between the two modelling approaches.
CONCLUSIONS: The importance of N2 O emissions from different N-pools in soil for the interpretation of N2 O isotopocules data was demonstrated using a Rayleigh-type model. Earlier statements concerning exponential increase in native soil nitrate pool activity highlighted in previous studies should be replaced with a polynomial increase with dependency on both N-pool sizes.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:33 |
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| Enthalten in: |
Rapid communications in mass spectrometry : RCM - 33(2019), 5 vom: 15. März, Seite 449-460 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Castellano-Hinojosa, Antonio [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 04.03.2019 Date Revised 15.11.2023 published: Print Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1002/rcm.8374 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM291916120 |
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| 100 | 1 | |a Castellano-Hinojosa, Antonio |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Improved isotopic model based on 15 N tracing and Rayleigh-type isotope fractionation for simulating differential sources of N2 O emissions in a clay grassland soil |
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| 500 | |a Date Revised 15.11.2023 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a © 2018 The Authors Rapid Communications in Mass Spectrometry Published by John Wiley & Sons, Ltd. | ||
| 520 | |a RATIONALE: Isotopic signatures of N2 O can help distinguish between two sources (fertiliser N or endogenous soil N) of N2 O emissions. The contribution of each source to N2 O emissions after N-application is difficult to determine. Here, isotopologue signatures of emitted N2 O are used in an improved isotopic model based on Rayleigh-type equations | ||
| 520 | |a METHODS: The effects of a partial (33% of surface area, treatment 1c) or total (100% of surface area, treatment 3c) dispersal of N and C on gaseous emissions from denitrification were measured in a laboratory incubation system (DENIS) allowing simultaneous measurements of NO, N2 O, N2 and CO2 over a 12-day incubation period. To determine the source of N2 O emissions those results were combined with both the isotope ratio mass spectrometry analysis of the isotopocules of emitted N2 O and those from the 15 N-tracing technique | ||
| 520 | |a RESULTS: The spatial dispersal of N and C significantly affected the quantity, but not the timing, of gas fluxes. Cumulative emissions are larger for treatment 3c than treatment 1c. The 15 N-enrichment analysis shows that initially ~70% of the emitted N2 O derived from the applied amendment followed by a constant decrease. The decrease in contribution of the fertiliser N-pool after an initial increase is sooner and larger for treatment 1c. The Rayleigh-type model applied to N2 O isotopocules data (δ15 Nbulk -N2 O values) shows poor agreement with the measurements for the original one-pool model for treatment 1c; the two-pool models gives better results when using a third-order polynomial equation. In contrast, in treatment 3c little difference is observed between the two modelling approaches | ||
| 520 | |a CONCLUSIONS: The importance of N2 O emissions from different N-pools in soil for the interpretation of N2 O isotopocules data was demonstrated using a Rayleigh-type model. Earlier statements concerning exponential increase in native soil nitrate pool activity highlighted in previous studies should be replaced with a polynomial increase with dependency on both N-pool sizes | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Loick, Nadine |e verfasserin |4 aut | |
| 700 | 1 | |a Dixon, Elizabeth |e verfasserin |4 aut | |
| 700 | 1 | |a Matthews, G Peter |e verfasserin |4 aut | |
| 700 | 1 | |a Lewicka-Szczebak, Dominika |e verfasserin |4 aut | |
| 700 | 1 | |a Well, Reinhard |e verfasserin |4 aut | |
| 700 | 1 | |a Bol, Roland |e verfasserin |4 aut | |
| 700 | 1 | |a Charteris, Alice |e verfasserin |4 aut | |
| 700 | 1 | |a Cardenas, Laura |e verfasserin |4 aut | |
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