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| Titel |
Does biochar with organic amendments affect denitrification in an agricultural soil? |
| VerfasserIn |
Regine Maier, Gerhard Soja, Wolfgang Friesl Hanl, Gerald Dunst, Barbara Kitzler |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250135297
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| Publikation (Nr.) |
 EGU/EGU2016-16146.pdf |
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| Zusammenfassung |
| In this laboratory experiment we investigated the influence of biochar (BC) application on dinitrogen (N2) and nitrous oxide (N2O) emissions from an agricultural soil in Austria.
We produced BC at 550°C from fiber sludge and husk, partly enriched with ammonium sulfate and mixed with garden green compost at a 50/50 ratio (w/w). The gleyic Cambisol originates from an experimental site in Kaindorf, Austria. For the incubation experiment we established three different treatments in 2014: K (control plots); T1 (1 % BC-compost mixture) and T2 (0.5 % BC-compost mixture enriched with 175 kg N ha-1). We used the helium gas flow soil core technique to quantify N2 and N2O fluxes simultaneously. Therefore, we incubated soil cores at ambient air temperature (20 and 24°C) at 20 and 50% water filled pore space (WFPS).
Results show that before BC addition N2 and N2O fluxes were similar at all treatments. Measurements of pure nitrogen-enriched BC show very high gaseous losses in form of N2 and N2O. Raising temperature promotes N2 production at all treatments. Application of N-enriched BC led to significantly higher N2 fluxes compared to K.
N2O fluxes increased significantly at fertilized BC plots (T2) compared to K and T1 at both water contents. Raising WFPS supports higher N2 production at all treatments but lowers N2 fluxes at BC plots. |
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