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| Titel |
Biochar application reduces N2O emission in intensively managed temperate grassland |
| VerfasserIn |
R. Felber, J. Leifeld, A. Neftel |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063044
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| Zusammenfassung |
| Biochar, a pyrolysis product of organic residues, is seen as an amendment for agricultural
soils to improve soil fertility, sequester CO2 and reduce N2O emissions. Mainly used in
highly weathered tropical soils, the interest of using biochar in intensively managed
temperate soils is increasing. Our previous laboratory incubations have shown N2O reduction
potentials of between 20 and 100% for temperate soils after biochar application (Felber et al.,
Biogeosciences Discuss, 2012).
To assess the effect of biochar application under field conditions, a plot experiment (3
control vs. 3 biochar amended plots of 3x3 m size at a rate of 15 t ha-1) was set
up in a temperate intensively managed grassland soil. N2O and CO2 emissions
were quasi-continuously measured by static chambers under standard management
practice over 8 months. In parallel soil samples were taken monthly from all plots and
their N2O and CO2 productions were measured under controlled conditions in the
lab.
At the beginning of the field measurements (April 2011) cumulative N2O fluxes from biochar
amended plots were above those of control plots, but the pattern reversed towards reduced
fluxes from biochar plots after 3 months and the reduction reached about 15% by the
end of 2011. The biochar effect on reducing N2O emissions in the laboratory was
two times that of the field measurements, indicating that results from laboratory
experiments are not directly transferable to field conditions. The experiments indicate a
substantial N2O emission reduction potential of biochar in temperate grassland
fields. |
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