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Sources of nitrous oxide from intensively managed pasture soils: The hole in the pipe

Friedl, Johannes; Scheer, Clemens 1; De Rosa, Daniele; Müller, Christoph; Grace, Peter R.; Rowlings, David W.
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)


Rainfall and irrigation trigger large pulses of the powerful greenhouse gas N$_{2}$O from intensively managed pastures, produced via multiple, simultaneously occurring pathways. These N$_{2}$O pulses can account for a large fraction of total N$_{2}$O losses, demonstrating the importance to determine magnitude and source partitioning of N$_{2}$O under these conditions. This study investigated the response of different pathways of N$_{2}$O production to wetting across three different textured pasture soils. Soil microcosms were fertilised with an ammonium nitrate (NH$_{4}$NO$_{3}$) solution which was either single or double $^{15}$N labelled, wetted to four different water-filled pore space (WFPS) levels, and incubated over two days. The use of a $^{15}$N pool mixing model together with soil N gross transformations enabled the attribution of N$_{2}$O to specific pathways, and to express N$_{2}$O emissions as a fraction of the underlying N transformation. Denitrification and nitrification mediated pathways contributed to the production of N$_{2}$O in all soils, regardless of WFPS. Denitrification was the main pathway of N$_{2}$O production accounting for >50% of cumulative N$_{2}$O emissions even at low WFPS. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000134276
Veröffentlicht am 23.06.2021
DOI: 10.1088/1748-9326/abfde7
Zitationen: 5
Web of Science
Zitationen: 3
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1748-9318, 1748-9326
KITopen-ID: 1000134276
HGF-Programm 12.11.22 (POF IV, LK 01) Biogeochemical modeling of ecosystem-climate interactions
Erschienen in Environmental Research Letters
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 16
Heft 6
Seiten 065004
Nachgewiesen in Dimensions
Web of Science
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