Improved isotopic model based on <sup>15</sup>N tracing and Rayleigh‐type isotope fractionation for simulating differential sources of N<sub>2</sub>O emissions in a clay grassland soil
dc.contributor.author | Castellano-Hinojosa, Antonio | |
dc.contributor.author | Loick, Nadine | |
dc.contributor.author | Dixon, E | |
dc.contributor.author | Matthews, Peter | |
dc.contributor.author | Lewicka‐Szczebak, D | |
dc.contributor.author | Well, R | |
dc.contributor.author | Bol, R | |
dc.contributor.author | Charteris, A | |
dc.contributor.author | Cardenas, L | |
dc.date.accessioned | 2019-05-07T11:20:54Z | |
dc.date.issued | 2019-03-15 | |
dc.identifier.issn | 0951-4198 | |
dc.identifier.issn | 1097-0231 | |
dc.identifier.uri | http://hdl.handle.net/10026.1/13777 | |
dc.description.abstract |
<jats:sec><jats:title>Rationale</jats:title><jats:p>Isotopic signatures of N<jats:sub>2</jats:sub>O can help distinguish between two sources (fertiliser N or endogenous soil N) of N<jats:sub>2</jats:sub>O emissions. The contribution of each source to N<jats:sub>2</jats:sub>O emissions after N‐application is difficult to determine. Here, isotopologue signatures of emitted N<jats:sub>2</jats:sub>O are used in an improved isotopic model based on Rayleigh‐type equations.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>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, N<jats:sub>2</jats:sub>O, N<jats:sub>2</jats:sub> and CO<jats:sub>2</jats:sub> over a 12‐day incubation period. To determine the source of N<jats:sub>2</jats:sub>O emissions those results were combined with both the isotope ratio mass spectrometry analysis of the isotopocules of emitted N<jats:sub>2</jats:sub>O and those from the <jats:sup>15</jats:sup>N‐tracing technique.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>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 <jats:sup>15</jats:sup>N‐enrichment analysis shows that initially ~70% of the emitted N<jats:sub>2</jats:sub>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 N<jats:sub>2</jats:sub>O isotopocules data (δ<jats:sup>15</jats:sup>N<jats:sup>bulk</jats:sup>‐N<jats:sub>2</jats:sub>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.</jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p>The importance of N<jats:sub>2</jats:sub>O emissions from different N‐pools in soil for the interpretation of N<jats:sub>2</jats:sub>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.</jats:p></jats:sec> | |
dc.format.extent | 449-460 | |
dc.format.medium | ||
dc.language | en | |
dc.language.iso | eng | |
dc.publisher | Wiley | |
dc.title | Improved isotopic model based on <sup>15</sup>N tracing and Rayleigh‐type isotope fractionation for simulating differential sources of N<sub>2</sub>O emissions in a clay grassland soil | |
dc.type | journal-article | |
dc.type | Journal Article | |
plymouth.author-url | https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000459797600007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008 | |
plymouth.issue | 5 | |
plymouth.volume | 33 | |
plymouth.publication-status | Published | |
plymouth.journal | Rapid Communications in Mass Spectrometry | |
dc.identifier.doi | 10.1002/rcm.8374 | |
plymouth.organisational-group | /Plymouth | |
plymouth.organisational-group | /Plymouth/Faculty of Science and Engineering | |
plymouth.organisational-group | /Plymouth/Users by role | |
dc.publisher.place | England | |
dcterms.dateAccepted | 2018-12-12 | |
dc.rights.embargodate | 9999-12-31 | |
dc.identifier.eissn | 1097-0231 | |
dc.rights.embargoperiod | Not known | |
rioxxterms.versionofrecord | 10.1002/rcm.8374 | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.licenseref.startdate | 2019-03-15 | |
rioxxterms.type | Journal Article/Review |