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<p>Understanding how grazing influences soil organic carbon (SOC) storage (and how best to amend these losses) is crucial for sustainable pasture management. This study used mesocosm experiments with <i>Festuca arundinacea</i> to investigate how biochar amendments influence SOC dynamics through microbial activity in two soil types of differing chemical character under simulated grazing conditions. Biochar consistently increases SOC by 595% and mineral–associated organic carbon (MAOC) by 39% across different soil types, primarily through the stimulatory effect of biochar on soil microbial communities. Increased microbial decomposition leads to the formation of stable organo–metal complexes, particularly with iron (Fe) and aluminum (Al) in red soils and calcium (Ca) in calcareous soils. While biochar is beneficial in both soil types, its impact is more immediately obvious in red soils due to differences in soil pH and mineral content, and the alkalizing effect of biochar is likely to also provide long–term protection against acidification in more calcareous karst soils. Therefore, biochar amendment is beneficial for SOC stability and soil fertility in karst regions, particularly in red soils. Simulated grazing reduces SOC in calcareous soil, but the negative impacts may&#xa0;be mitigated by biochar, though the effectiveness varies with soil type. These findings highlight the need for precision management strategies tailored to specific soil types to enhance carbon storage and soil health in karst ecosystems as global changes intensify.</p> Graphical Abstract <p></p>

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Biochar efficacy in enhancing soil carbon fractions is mediated by parent soil type in grazing karst grassland

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月7日

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  • Shiwen Zhu,
  • Yili Guo,
  • Hanhan Zhou,
  • Wenjia Luo,
  • Xun Yi,
  • Yangming Zhou,
  • Yuanlong Wu,
  • Daniel F. Petticord,
  • Xuxin Song

摘要

Understanding how grazing influences soil organic carbon (SOC) storage (and how best to amend these losses) is crucial for sustainable pasture management. This study used mesocosm experiments with Festuca arundinacea to investigate how biochar amendments influence SOC dynamics through microbial activity in two soil types of differing chemical character under simulated grazing conditions. Biochar consistently increases SOC by 595% and mineral–associated organic carbon (MAOC) by 39% across different soil types, primarily through the stimulatory effect of biochar on soil microbial communities. Increased microbial decomposition leads to the formation of stable organo–metal complexes, particularly with iron (Fe) and aluminum (Al) in red soils and calcium (Ca) in calcareous soils. While biochar is beneficial in both soil types, its impact is more immediately obvious in red soils due to differences in soil pH and mineral content, and the alkalizing effect of biochar is likely to also provide long–term protection against acidification in more calcareous karst soils. Therefore, biochar amendment is beneficial for SOC stability and soil fertility in karst regions, particularly in red soils. Simulated grazing reduces SOC in calcareous soil, but the negative impacts may be mitigated by biochar, though the effectiveness varies with soil type. These findings highlight the need for precision management strategies tailored to specific soil types to enhance carbon storage and soil health in karst ecosystems as global changes intensify.

Graphical Abstract