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<p>Cadmium (Cd) contamination poses a significant hazard to the environment and human health, making it important to explore more effective amendments for Cd-contaminated soils. To verify the effects of biochar derived from a typical halophyte, <i>Salicornia europaea</i>, on immobilizing Cd in acidic soil, incubation experiment, column leaching experiment, and pot trials were conducted. The results showed that the addition of biochar enhances the soil’s adsorption capacity for Cd. Biochar reduced the content of acid-extractable Cd while increasing the levels of reducible and residual Cd. Compared with the control, 1% and 2% biochar significantly increased soil pH, organic matter, and cation exchange capacity. Additionally, the concentration of Cd in the leachate amended with 1% and 2% biochar decreased by 53.3% and 85.8%, indicating persistent effects. Furthermore, the application of biochar (1% and 2%) effectively promoted the growth of romaine lettuce and decreased the Cd concentration in plants by 64.5% and 67.9%. Therefore, biochar derived from <i>S. europaea</i> can be employed as an effective immobilizing agent for mitigating Cd-contaminated acidic soil.</p>

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Effectiveness of Salicornia europaea-Derived Biochar in Immobilizing Cadmium in Acidic Soil

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Shaoqing Ge,
  • Lei Wang,
  • Mingfang Hu,
  • Zhenyong Zhao,
  • Changyan Tian

摘要

Cadmium (Cd) contamination poses a significant hazard to the environment and human health, making it important to explore more effective amendments for Cd-contaminated soils. To verify the effects of biochar derived from a typical halophyte, Salicornia europaea, on immobilizing Cd in acidic soil, incubation experiment, column leaching experiment, and pot trials were conducted. The results showed that the addition of biochar enhances the soil’s adsorption capacity for Cd. Biochar reduced the content of acid-extractable Cd while increasing the levels of reducible and residual Cd. Compared with the control, 1% and 2% biochar significantly increased soil pH, organic matter, and cation exchange capacity. Additionally, the concentration of Cd in the leachate amended with 1% and 2% biochar decreased by 53.3% and 85.8%, indicating persistent effects. Furthermore, the application of biochar (1% and 2%) effectively promoted the growth of romaine lettuce and decreased the Cd concentration in plants by 64.5% and 67.9%. Therefore, biochar derived from S. europaea can be employed as an effective immobilizing agent for mitigating Cd-contaminated acidic soil.