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<p>Microorganism-based biochar has been mainly used for plant growth promotion and pollution management, but its role in soil fertility has been neglected. In this study, we used biochar loaded with <i>Bacillus cereus</i> SR, a carbon-fixing strain, to achieve a stable inoculation and increase soil organic carbon (SOC) content. Compared with the control group, microorganism-based biochar was more effective in increasing SOC content and reducing CO<sub>2</sub> emissions, with SOC content increasing by 36.38% to 136.34%. Biochar treatment alone inhibited soil enzyme activities but biochar carrying <i>Bacillus cereus</i> SR alleviated the inhibitory effect. The 500&#xa0;°C strain-containing biochar exhibits the potential to sustainably increase SOC, as its ribulose-1,5-bisphosphate carboxylase/oxygenase enzyme activity was 53.38% and 45.77% higher than the control group on the 24th and 63rd days, respectively. This phenomenon may be attributed to the moderate available organic carbon content of 500 ℃ biochar. Microorganism-based biochar increased the abundance of <i>Firmicutes</i>, <i>Bacilli</i>, <i>Bacillaceae</i>, <i>Bacillales</i>, and <i>Bacillus</i> at each taxonomic level. These modifications enhanced symbiotic relationships and community stability among soil bacteria. These results provide a theoretical basis for the application of microorganism-based biochar in improving SOC sequestration.</p>

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Carbon-fixing strain-based biochar outperforms biochar alone in enhancing microbial symbiosis and soil organic carbon

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月19日

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  • Jie Li,
  • Hong Jiang,
  • Ningyi Xie,
  • Changchun Feng,
  • Changquan Wang,
  • Rong Huang,
  • Qi Tao,
  • Xiaoyan Tang,
  • Yingjie Wu,
  • Youlin Luo,
  • Qiquan Li,
  • Bing Li

摘要

Microorganism-based biochar has been mainly used for plant growth promotion and pollution management, but its role in soil fertility has been neglected. In this study, we used biochar loaded with Bacillus cereus SR, a carbon-fixing strain, to achieve a stable inoculation and increase soil organic carbon (SOC) content. Compared with the control group, microorganism-based biochar was more effective in increasing SOC content and reducing CO2 emissions, with SOC content increasing by 36.38% to 136.34%. Biochar treatment alone inhibited soil enzyme activities but biochar carrying Bacillus cereus SR alleviated the inhibitory effect. The 500 °C strain-containing biochar exhibits the potential to sustainably increase SOC, as its ribulose-1,5-bisphosphate carboxylase/oxygenase enzyme activity was 53.38% and 45.77% higher than the control group on the 24th and 63rd days, respectively. This phenomenon may be attributed to the moderate available organic carbon content of 500 ℃ biochar. Microorganism-based biochar increased the abundance of Firmicutes, Bacilli, Bacillaceae, Bacillales, and Bacillus at each taxonomic level. These modifications enhanced symbiotic relationships and community stability among soil bacteria. These results provide a theoretical basis for the application of microorganism-based biochar in improving SOC sequestration.