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<p>The escalation of greenhouse gas (GHG) emissions is recognized as a critical contributor to global warming, and biochar soil amendment has become a potential mitigation strategy. There is a lack of systematic research on the GHG emission reduction effect of biochar on permafrost. The temperature-dependent efficacy of corn straw biochar (2%, 4%, 8% soil dry weight) in regulating CO<sub>2</sub>, CH<sub>4</sub>, and N<sub>2</sub>O fluxes across three permafrost forest types (<i>Larix gmelinii</i>, <i>Betula platyphylla</i>, and mixed <i>L. gmelinii</i>-<i>B. platyphylla</i> forests) was investigated in Northeast China. The results demonstrated forest-specific responses (<i>B. platyphylla</i> forest exhibited linear CO<sub>2</sub> emissions reductions proportional to biochar rates, which achieved a reduction of 27.8% at 8% biochar). <i>L. gmelinii</i> and mixed forests showed nonlinear trends, which peaked at 28.4% and 22.0% suppression with 4% biochar before rebounding at 8% biochar. CH<sub>4</sub> oxidation capacity was consistently inhibited across all forests with suppression intensities escalating to 58.5% (<i>B. platyphylla</i>), 30.7% (<i>L. gmelinii</i>), and 32.4% (mixed) at 8% biochar. N<sub>2</sub>O fluxes remained unaffected by biochar amendments. Global warming potential dynamics mirrored CO<sub>2</sub> emission, which displayed enhanced biochar efficacy during cooling phases. Biochar addition reduced soil organic carbon loss, which demonstrated its dual role in carbon stabilization and GHG mitigation under varying temperature conditions in permafrost regions.</p>

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Corn straw biochar reduces greenhouse gas emissions from permafrost forest soils under warming and cooling conditions

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Haiyin Wu,
  • Yufei Wu,
  • Shuying Zang,
  • Xiaodong Wu,
  • Liang Ma,
  • Hanxi Wang

摘要

The escalation of greenhouse gas (GHG) emissions is recognized as a critical contributor to global warming, and biochar soil amendment has become a potential mitigation strategy. There is a lack of systematic research on the GHG emission reduction effect of biochar on permafrost. The temperature-dependent efficacy of corn straw biochar (2%, 4%, 8% soil dry weight) in regulating CO2, CH4, and N2O fluxes across three permafrost forest types (Larix gmelinii, Betula platyphylla, and mixed L. gmelinii-B. platyphylla forests) was investigated in Northeast China. The results demonstrated forest-specific responses (B. platyphylla forest exhibited linear CO2 emissions reductions proportional to biochar rates, which achieved a reduction of 27.8% at 8% biochar). L. gmelinii and mixed forests showed nonlinear trends, which peaked at 28.4% and 22.0% suppression with 4% biochar before rebounding at 8% biochar. CH4 oxidation capacity was consistently inhibited across all forests with suppression intensities escalating to 58.5% (B. platyphylla), 30.7% (L. gmelinii), and 32.4% (mixed) at 8% biochar. N2O fluxes remained unaffected by biochar amendments. Global warming potential dynamics mirrored CO2 emission, which displayed enhanced biochar efficacy during cooling phases. Biochar addition reduced soil organic carbon loss, which demonstrated its dual role in carbon stabilization and GHG mitigation under varying temperature conditions in permafrost regions.