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Estimating global terrestrial denitrification from measured N$_{2}$O:(N$_{2}$O + N$_{2}$) product ratios

Scheer, Clemens; Fuchs, Kathrin; Pelster, David E; Butterbach-Bahl, Klaus

The use of nitrogen (N) fertilizers and cultivation of N-fixing crops has grown exponentially over the last century, with severe environmental consequences. Most of the anthropogenic reactive nitrogen will ultimately be returned by denitrification to the atmosphere as inert N$_{2}$, but the magnitude of denitrification and the ratio of N$_{2}$O to (N$_{2}$O + N$_{2}$) emitted (R$_{N_{2}O}$) is unknown for the vast majority of terrestrial ecosystems. This paper provides estimates of terrestrial denitrification and R$_{N_{2}O}$ by reviewing existing literature and compiling a N budget for the global land surface. We estimate that terrestrial denitrification has doubled from 80 Tg-N year$^{-1}$ in pre-industrial times to 160 Tg-N year$^{-1}$ in 2005 with a mean R$_{N_{2}O}$ of approximately 0.08. We conclude that upscaling of R$_{N_{2}O}$ can provide spatial estimates of terrestrial denitrification when data from acetylene inhibition methods are excluded. Recent advances in methodologies to measure N$_{2}$ emissions and R$_{N_{2}O}$ under field conditions could open the way for more effective management of terrestrial N flows.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129649
Veröffentlicht am 12.02.2021
DOI: 10.1016/j.cosust.2020.07.005
Zitationen: 3
Web of Science
Zitationen: 3
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 1877-3435
KITopen-ID: 1000129649
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Current opinion in environmental sustainability
Verlag Elsevier
Band 47
Seiten 72–80
Nachgewiesen in Scopus
Web of Science
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