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Biochar suppresses N2O emissions while maintaining N availability in a sandy loam soil

Case, Sean D.C. ; McNamara, Niall P. ; Reay, David S. ; Stott, Andy W. ; Grant, Helen K. ; Whitaker, Jeanette

Soil biology & biochemistry, 2015-02, Vol.81, p.178-185 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Biochar suppresses N2O emissions while maintaining N availability in a sandy loam soil
  • Autor: Case, Sean D.C. ; McNamara, Niall P. ; Reay, David S. ; Stott, Andy W. ; Grant, Helen K. ; Whitaker, Jeanette
  • Assuntos: Ammonium ; Biochar ; Denitrification ; Immobilisation ; Mineralisation ; Nitrate ; Nitrification ; Nitrous oxide
  • É parte de: Soil biology & biochemistry, 2015-02, Vol.81, p.178-185
  • Descrição: Nitrous oxide (N2O) from agricultural soil is a significant source of greenhouse gas emissions. Biochar amendment can contribute to climate change mitigation by suppressing emissions of N2O from soil, although the mechanisms underlying this effect are poorly understood. We investigated the effect of biochar on soil N2O emissions and N cycling processes by quantifying soil N immobilisation, denitrification, nitrification and mineralisation rates using 15N pool dilution techniques and the FLUAZ numerical calculation model. We then examined whether biochar amendment affected N2O emissions and the availability and transformations of N in soils. Our results show that biochar suppressed cumulative soil N2O production by 91% in near-saturated, fertilised soils. Cumulative denitrification was reduced by 37%, which accounted for 85–95 % of soil N2O emissions. We also found that physical/chemical and biological ammonium (NH4+) immobilisation increased with biochar amendment but that nitrate (NO3−) immobilisation decreased. We concluded that this immobilisation was insignificant compared to total soil inorganic N content. In contrast, soil N mineralisation significantly increased by 269% and nitrification by 34% in biochar-amended soil. These findings demonstrate that biochar amendment did not limit inorganic N availability to nitrifiers and denitrifiers, therefore limitations in soil NH4+ and NO3− supply cannot explain the suppression of N2O emissions. These results support the concept that biochar application to soil could significantly mitigate agricultural N2O emissions through altering N transformations, and underpin efforts to develop climate-friendly agricultural management techniques. •Soil N2O emissions and denitrification rates decreased in biochar-amended soil.•Soil N supply from mineralisation and nitrification rates increased in amended soil.•Immobilisation of NH4+ was increased by a small amount.•Biochar effect on N availability could not explain N2O suppression.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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