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Barometric Process Separation: New Method for Quantifying Nitrification, Denitrification, and Nitrous Oxide Sources in Soils

Ingwersen, Joachim 1; Butterbach-Bahl, Klaus 1; Gasche, Rainer 1; Papen, Hans 1; Richter, Otto
1 Forschungszentrum Karlsruhe (FZKA)


A method (Barometric Process Separation, BaPS) was developed for the quantification of gross nitrification rates and denitrification rates in oxic soil using intact soil cores incubated in an isothermal gas tight system. Gross nitrification rates and denitrification rates are derived from measurements of changes (i) in air pressure within the closed system, which are primarily the result of the activities of nitrification (pressure decrease), denitrification (pressure increase), and respiration (pressure neutral), and (ii) of O$_{2}$ and CO$_{2}$ concentrations in the system. Besides these biological processes, the contribution of physicochemical dissolution of produced CO$_{2}$ in soil water to the pressure changes observed is to be considered. The method allows collection of additional information about the contribution of nitrification and denitrification to N$_{2}$O emission from soil, provided simultaneous measurements of N$_{2}$O emission are performed. Furthermore, BaPS can be used to quantify the percentage of N$_{2}$O lost from nitrification. The advantage of BaPS is that disturbance of the soil system is minimized compared with other methods such as the use of gaseous inhibitors (e.g., acetylene) or application of $^{15}$N compounds to the soil. ... mehr

DOI: 10.2136/sssaj1999.03615995006300010018x
Zitationen: 114
Web of Science
Zitationen: 96
Zitationen: 100
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 1999
Sprache Englisch
Identifikator ISSN: 0361-5995
KITopen-ID: 1000097894
Erschienen in Soil Science Society of America journal
Verlag John Wiley and Sons
Band 63
Heft 1
Seiten 117-128
Nachgewiesen in Web of Science
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