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<p>Microplastics (MPs), defined as particles smaller than 5&#xa0;mm, pose a significant threat to agricultural sustainability by compromising soil health and reducing crop productivity. Biochar (BC), a porous carbonaceous material characterized by unique structural and chemical properties, has emerged as a promising remediation strategy for soils contaminated with MPs. However, the synergistic effects of BC and MPs on critical soil functions and plant nitrogen use efficiency are not yet fully elucidated. The interaction between BC and polyvinyl chloride (PVC) MPs was examined in soil-plant systems using <sup>15</sup>N isotope tracing technology. Different application rates of BC (0.5% and 2% w/w) were tested to evaluate their influence on enzymatic activities, nitrogen transformation, and <sup>15</sup>N utilization efficiency in MPs-contaminated soils. Applying 0.5% BC improved urease and protease activities, boosted organic nitrogen mineralization, and increased <sup>15</sup>N utilization by 10.89%-37.56% in soils with certain MPs levels, though its effectiveness declined with higher MPs concentrations. In contrast, 2% BC consistently enhanced enzyme activities, altered nitrogen pathways, and improved <sup>15</sup>N utilization by 3.84%-36.77% across increasing MPs levels, while reducing <sup>15</sup>N loss. 0.5% BC effectively sustains crop productivity in soils with light contamination, whereas 2% BC is essential for stabilizing the nitrogen cycle and mitigating the effects of heavy pollution. These findings offer both a theoretical framework and practical guidance for the implementation of tailored BC remediation strategies in agriculture affected by MPs contamination.</p> Graphical Abstract <p></p>

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Biochar as a Soil Amendment Alleviates Microplastic-induced Nitrogen Inhibition in Ryegrass: Threshold Effects Revealed by 15N Tracing

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Canrong Zhou,
  • Hengying Ji

摘要

Microplastics (MPs), defined as particles smaller than 5 mm, pose a significant threat to agricultural sustainability by compromising soil health and reducing crop productivity. Biochar (BC), a porous carbonaceous material characterized by unique structural and chemical properties, has emerged as a promising remediation strategy for soils contaminated with MPs. However, the synergistic effects of BC and MPs on critical soil functions and plant nitrogen use efficiency are not yet fully elucidated. The interaction between BC and polyvinyl chloride (PVC) MPs was examined in soil-plant systems using 15N isotope tracing technology. Different application rates of BC (0.5% and 2% w/w) were tested to evaluate their influence on enzymatic activities, nitrogen transformation, and 15N utilization efficiency in MPs-contaminated soils. Applying 0.5% BC improved urease and protease activities, boosted organic nitrogen mineralization, and increased 15N utilization by 10.89%-37.56% in soils with certain MPs levels, though its effectiveness declined with higher MPs concentrations. In contrast, 2% BC consistently enhanced enzyme activities, altered nitrogen pathways, and improved 15N utilization by 3.84%-36.77% across increasing MPs levels, while reducing 15N loss. 0.5% BC effectively sustains crop productivity in soils with light contamination, whereas 2% BC is essential for stabilizing the nitrogen cycle and mitigating the effects of heavy pollution. These findings offer both a theoretical framework and practical guidance for the implementation of tailored BC remediation strategies in agriculture affected by MPs contamination.

Graphical Abstract