Journal
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
Volume 140, Issue 1-2, Pages 309-313Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.agee.2010.12.005
Keywords
Biochar; Black carbon; Greenhouse gas emissions; Climate change mitigation
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Biochar addition to agricultural soil has been suggested to mitigate climate change through increased biogenic carbon storage and reduction of greenhouse gas emissions. We measured the fluxes of N2O, CO2, and CH4 after adding 9 t ha(-1) biochar on an agricultural soil in Southern Finland in May 2009. We conducted these measurements twice a week for 1.5 months, between sowing and canopy closure, to capture the period of highest N2O emissions, where the potential for mitigation would also be highest. Biochar addition increased CH4 uptake (96% increase in the average cumulative CH4 uptake), but no statistically significant differences were observed in the CO2 and N2O emissions between the biochar amended and control plots. Added biochar increased soil water holding capacity by 11%. Further studies are needed to clarify whether this may help balance fluctuations in water availability to plants in the future climate with more frequent drought periods. (C) 2010 Elsevier B.V. All rights reserved.
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