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Effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover, the N$_{2}$O reductase-gene nosZ and N$_{2}$O:N$_{2}$ partitioning from agricultural soils

Friedl, Johannes; Scheer, Clemens; Rowlings, David W.; Deltedesco, Evi; Gorfer, Markus; De Rosa, Daniele; Grace, Peter R.; Müller, Christoph; Keiblinger, Katharina M.

Nitrification inhibitors (NIs) have been shown to reduce emissions of the greenhouse gas nitrous oxide (N$_{2}$O) from agricultural soils. However, their N$_{2}$O reduction efficacy varies widely across different agro-ecosystems, and underlying mechanisms remain poorly understood. To investigate effects of the NI 3,4-dimethylpyrazole-phosphate (DMPP) on N-turnover from a pasture and a horticultural soil, we combined the quantification of N$_{2}$ and N$_{2}$O emissions with $^{15}$N tracing analysis and the quantification of the N$_{2}$O-reductase gene (nosZ) in a soil microcosm study. Nitrogen fertilization suppressed nosZ abundance in both soils, showing that high nitrate availability and the preferential reduction of nitrate over N$_{2}$O is responsible for large pulses of N$_{2}$O after the fertilization of agricultural soils. DMPP attenuated this effect only in the horticultural soil, reducing nitrification while increasing nosZ abundance. DMPP reduced N$_{2}$O emissions from the horticultural soil by >50% but did not affect overall N$_{2}$ + N$_{2}$O losses, demonstrating the shift in the N$_{2}$O:N$_{2}$ ratio towards N$_{2}$ as a key mechanism of N$_{2}$O mitigation by NIs. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125905
Veröffentlicht am 10.11.2020
DOI: 10.1038/s41598-020-59249-z
Zitationen: 2
Web of Science
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000125905
Erschienen in Scientific reports
Band 10
Heft 1
Seiten 2399
Vorab online veröffentlicht am 12.02.2020
Nachgewiesen in Scopus
Web of Science
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