【土壤中生物质炭与脱氮】Maria Luz Cayuela Miguel Angel Sánchez-Monedero Asunción Roig Kelly Hanley Akio Enders & Johannes Lehmann. Biochar and denitrification in soils: when how much and why does biochar reduce N₂O emissions? Scientific Reports 2013 3 Article number: 1732 doi:10.1038-srep01732

Abstract

Agricultural soils represent the main source of anthropogenic N₂O emissions. Recently interactions of black carbon with the nitrogen cycle have been recognized and the use of biochar is being investigated as a means to reduce N₂O emissions. However the mechanisms of reduction remain unclear. Here we demonstrate the significant impact of biochar on denitrification with a consistent decrease in N₂O emissions by 10–90% in 14 different agricultural soils. Using the ¹⁵N gas-flux method we observed a consistent reduction of the N₂O-(N₂ + N₂O) ratio which demonstrates that biochar facilitates the last step of denitrification. Biochar acid buffer capacity was identified as an important aspect for mitigation that was not primarily caused by a pH shift in soil. We propose the function of biochar as an “electron shuttle” that facilitates the transfer of electrons to soil denitrifying microorganisms which together with its liming effect would promote the reduction of N₂O to N₂.

【住宅草坪土壤释放的碳比农业土壤多】David R. Bowne  and Erin R. Johnson. Comparison of Soil Carbon Dioxide Efflux between Residential Lawns and Corn Fields. SSSAJ 2013 doi: 10.2136-sssaj2012.0346N

附件：