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

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

Abstract:

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
Originalveröffentlichung
DOI: 10.1088/1748-9326/abfde7
Scopus
Zitationen: 12
Dimensions
Zitationen: 14
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) Managed ecosystems as sources and sinks of GHGs
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
Scopus
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