Enrichment of natural 15N abundance during soil N losses under 20 years of continuous cereal cropping

Jones, Andrew R. and Dalal, Ram C. (2017) Enrichment of natural 15N abundance during soil N losses under 20 years of continuous cereal cropping. Science of the Total Environment, 574 282-287. doi:10.1016/j.scitotenv.2016.08.192


Author Jones, Andrew R.
Dalal, Ram C.
Title Enrichment of natural 15N abundance during soil N losses under 20 years of continuous cereal cropping
Formatted title
Enrichment of natural 15N abundance during soil N losses under 20 years of continuous cereal cropping
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 1879-1026
0048-9697
Publication date 2017-01-01
Year available 2016
Sub-type Letter to editor, brief commentary or brief communication
DOI 10.1016/j.scitotenv.2016.08.192
Open Access Status Not yet assessed
Volume 574
Start page 282
End page 287
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract It is generally accepted that the enrichment of natural (15)N abundance in soil over time is reflective of historic N cycling and loss, but this process in cropping soils is not yet clear. In this study, we identified an enrichment gradient of natural (15)N abundance during 20-year chronosequence of cereal cropping on Alfisols in southwest Queensland, Australia, that have no history of fertilisation. We demonstrate that the increase in soil (15)N abundance is explained by isotopic fractionation of (15)N during organic N mineralisation and nitrification, which lead to isotopically heavier ammonium retained in the soil and isotopically lighter soil nitrate taken up and removed by seasonal crops during harvest. Here we present a framework for natural (15)N isotopic fractionation co-occurring with N losses during long-term cultivation.
Formatted abstract
It is generally accepted that the enrichment of natural 15N abundance in soil over time is reflective of historic N cycling and loss, but this process in cropping soils is not yet clear. In this study, we identified an enrichment gradient of natural 15N abundance during 20-year chronosequence of cereal cropping on Alfisols in southwest Queensland, Australia, that have no history of fertilisation. We demonstrate that the increase in soil 15N abundance is explained by isotopic fractionation of 15N during organic N mineralisation and nitrification, which lead to isotopically heavier ammonium retained in the soil and isotopically lighter soil nitrate taken up and removed by seasonal crops during harvest. Here we present a framework for natural 15N isotopic fractionation co-occurring with N losses during long-term cultivation.
Keyword 15N
Ammonium
Cropping
Nitrate
Nitrification
Soil nitrogen
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Letter to editor, brief commentary or brief communication
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Tue, 11 Oct 2016, 10:27:08 EST by System User on behalf of Learning and Research Services (UQ Library)