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Disentangling gross N₂O production and consumption in soil

Wen, Y.; Chen, Z.; Dannenmann, M.; Carminati, A.; Willibald, G.; Kiese, R.; Wolf, B.; Veldkamp, E.; Butterbach-Bahl, K.; Corre, M.D.

The difficulty of measuring gross N₂O production and consumption in soil impedes our ability to predict N₂O dynamics across the soil-atmosphere interface. Our study aimed to disentangle these processes by comparing measurements from gas-flow soil core (GFSC) and $^{15}$N₂O pool dilution ($^{15}$N₂OPD) methods. GFSC directly measures soil N₂O and N₂ fluxes, with their sum as the gross N₂O production, whereas $^{15}$N₂OPD involves addition of $^{15}$N₂O into a chamber headspace and measuring its isotopic dilution over time. Measurements were conducted on intact soil cores from grassland, cropland, beech and pine forests. Across sites, gross N₂O production and consumption measured by $^{15}$N₂OPD were only 10% and 6%, respectively, of those measured by GFSC. However, $^{15}$N₂OPD remains the only method that can be used under field conditions to measure atmospheric N₂O uptake in soil. We propose to use different terminologies for the gross N₂O fluxes that these two methods quantified. For $^{15}$N₂OPD, we suggest using ‘gross N₂O emission and uptake’, which encompass gas exchange within the $^{15}$N₂O-labelled, soil air-filled pores. For GFSC, ‘gross N₂O production and consumption’ can be used, which includes both N₂O emitted into the soil air-filled pores and N₂O directly consumed, forming N₂, in soil anaerobic microsites.

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DOI: 10.5445/IR/1000062840
DOI: 10.1038/srep36517
Zitationen: 20
Web of Science
Zitationen: 17
Zitationen: 20
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 0068-1261
KITopen-ID: 1000062840
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Scientific reports
Verlag Natural Environment Research Council
Band 6
Seiten Art. Nr. 36517
Nachgewiesen in Scopus
Web of Science
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