KIT | KIT-Bibliothek | Impressum | Datenschutz

Nitrogen turnover and N$_{2}$O/N$_{2}$ ratio of three contrasting tropical soils amended with biochar

Fungo, B.; Chen, Zhe; Butterbach-Bahl, Klaus; Lehmannn, J.; Saiz, Gustavo; Braojos, Victor; Kolar, Allison; Rittl, Tatjana F.; Tenywa, M.; Kalbitz, K.; Neufeldt, H.; Dannenmann, Michael

Abstract:
Biochar has been reported to reduce emission of nitrous oxide (N$_{2}$O) from soils, but the mechanisms responsible remain fragmentary. For example, it is unclear how biochar effects on N$_{2}$O emissions are mediated through biochar effects on soil gross N turnover rates. Hence, we conducted an incubation study with three contrasting agricultural soils from Kenya (an Acrisol cultivated for 10-years (Acrisol10); an Acrisol cultivated for over 100-years (Acrisol100); a Ferralsol cultivated for over 100 years (Ferralsol)). The soils were amended with biochar at either 2% or 4% w/w. The $^{15}$N pool dilution technique was used to quantify gross N mineralization and nitrification and microbial consumption of extractable N over a 20-day incubation period at 25 °C and 70% water holding capacity of the soil, accompanied by N$_{2}$O emissions measurements. Direct measurements of N$_{2}$ emissions were conducted using the helium gas flow soil core method. N$_{2}$O emissions varied across soils with higher emissions in Acrisols than in Ferralsols. Addition of 2% biochar reduced N$_{2}$O emissions in all soils by 53 to 78% with no significant further reduction induced by addition at 4%. ... mehr

Open Access Logo


Verlagsausgabe §
DOI: 10.5445/IR/1000094666
Veröffentlicht am 06.06.2019
Originalveröffentlichung
DOI: 10.1016/j.geoderma.2019.04.007
Coverbild
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0016-7061, 1872-6259
KITopen-ID: 1000094666
Erschienen in Geoderma
Band 348
Seiten 12-20
Schlagworte Nitrification, Ammonification, Denitrification, N2O protonation, 15N pool dilution method, Di-nitrogen (N2)
Nachgewiesen in Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page