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<p>Agricultural carbon emissions constitute a substantial contributor to greenhouse gas (GHG) emissions, which poses challenges to achieving GHG reduction targets for sustainable agricultural development. This study investigated the seasonal variations in GHG emissions (N₂O, CO₂, CH₄) from black soil under the influence of soil amendments dicyandiamide (DCD) and biochar. Through laboratory experiments simulating growing season conditions, the effects of different amendment combinations and nitrogen fertilization regimes were analyzed. Results showed that urea application markedly enhanced N₂O and CO₂ emissions in growing season conditions. Biochar-amended treatments reduced N₂O emissions by 1.15–28.53%, enhanced CH<sub>4</sub> uptake by 8.18–11.52%, which exhibited dose-dependent suppression efficacy. Compared to the DN treatment (DCD + nitrogen), the BDN3 groups (biochar + DCD + nitrogen) reduced soil global warming potential by 5.65%, which significantly delayed nitrogen-induced soil acidification. Biochar-amended groups exhibited reduced NH₄⁺-N and NO₃⁻-N losses. In non-growing season conditions, biochar addition suppressed both CO₂ and N₂O emissions. The optimal GHG mitigation combination was identified as 2% biochar + 5% DCD + 0.1% nitrogen application, which reduced global warming potential by 21.75% and alleviated nitrogen-induced soil acidification. This research provides crucial insights for developing emission-reduction strategies in agricultural soil management.</p>

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Effects of nitrification inhibitor dicyandiamide and biochar on greenhouse gases emissions from black soils in different seasons

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Changzheng Zhang,
  • Shuying Zang,
  • Hailong Chang,
  • Yuqi Zhu,
  • Hanxi Wang

摘要

Agricultural carbon emissions constitute a substantial contributor to greenhouse gas (GHG) emissions, which poses challenges to achieving GHG reduction targets for sustainable agricultural development. This study investigated the seasonal variations in GHG emissions (N₂O, CO₂, CH₄) from black soil under the influence of soil amendments dicyandiamide (DCD) and biochar. Through laboratory experiments simulating growing season conditions, the effects of different amendment combinations and nitrogen fertilization regimes were analyzed. Results showed that urea application markedly enhanced N₂O and CO₂ emissions in growing season conditions. Biochar-amended treatments reduced N₂O emissions by 1.15–28.53%, enhanced CH4 uptake by 8.18–11.52%, which exhibited dose-dependent suppression efficacy. Compared to the DN treatment (DCD + nitrogen), the BDN3 groups (biochar + DCD + nitrogen) reduced soil global warming potential by 5.65%, which significantly delayed nitrogen-induced soil acidification. Biochar-amended groups exhibited reduced NH₄⁺-N and NO₃⁻-N losses. In non-growing season conditions, biochar addition suppressed both CO₂ and N₂O emissions. The optimal GHG mitigation combination was identified as 2% biochar + 5% DCD + 0.1% nitrogen application, which reduced global warming potential by 21.75% and alleviated nitrogen-induced soil acidification. This research provides crucial insights for developing emission-reduction strategies in agricultural soil management.