Scholarlink

Purpose <p>The research aimed to evaluate the ecological risks posed by different types and concentrations of MPs in <i>Cenchrus fungigraminus</i>, a high-quality forage crop.</p> Methods <p>Pot experiments were conducted to examine plant growth, physiological responses, and soil physical, chemical, and biological properties under exposure to polyethylene (PE) and polylactic acid (PLA) microplastics (MPs) at concentrations of 0.15%, 0.75%, and 1.5%.</p> Results <p>PE-MPs significantly inhibited plant growth only at the highest concentration (1.5%), reducing root length, stem fresh weight, and root fresh weight by 20.54%, 16.01%, and 11.86%, respectively. By contrast, PLA-MPs significantly reduced growth indicators at all tested concentrations, and the inhibitory effect was enhanced with increasing dosage. PLA-MPs also decreased total chlorophyll content by 20.72%–47.79%, increased malondialdehyde levels by 105.08%–271.09%, and reduced peroxidase activity by 28.92%–47.58%, while PE-MPs had no significant effect on these physiological parameters. High-throughput sequencing revealed that both MP types reduced the Shannon index and increased the Simpson index of the soil bacterial community. Furthermore, MPs increased the relative abundance of Proteobacteria and <i>Corynebacterium</i>, while decreasing that of Acidobacteria, <i>RB41</i>, and <i>norank_Gemmatimonadaceae</i>, indicating a decline in soil health.</p> Conclusion <p>This study demonstrates that PLA-MPs exhibit stronger inhibitory effects on <i>C. fungigraminus</i> growth and physiological processes than PE-MPs, and adversely impact soil nutrient availability and bacterial community structure. These findings provide essential basic data and a scientific foundation for assessing the ecological toxicity of MPs in forage crop systems.&#xa0;</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Microplastics inhibit Cenchrus fungigraminus growth by deteriorating soil conditions

  • 期刊论文

  • 发表日期：

    2026年4月16日

查看全文
  • Xiongyan Yang,
  • Jie Cheng,
  • Faguang Li,
  • Luqing Yang,
  • Yang Luo,
  • Zixia Song,
  • Xue Tian

摘要

Purpose

The research aimed to evaluate the ecological risks posed by different types and concentrations of MPs in Cenchrus fungigraminus, a high-quality forage crop.

Methods

Pot experiments were conducted to examine plant growth, physiological responses, and soil physical, chemical, and biological properties under exposure to polyethylene (PE) and polylactic acid (PLA) microplastics (MPs) at concentrations of 0.15%, 0.75%, and 1.5%.

Results

PE-MPs significantly inhibited plant growth only at the highest concentration (1.5%), reducing root length, stem fresh weight, and root fresh weight by 20.54%, 16.01%, and 11.86%, respectively. By contrast, PLA-MPs significantly reduced growth indicators at all tested concentrations, and the inhibitory effect was enhanced with increasing dosage. PLA-MPs also decreased total chlorophyll content by 20.72%–47.79%, increased malondialdehyde levels by 105.08%–271.09%, and reduced peroxidase activity by 28.92%–47.58%, while PE-MPs had no significant effect on these physiological parameters. High-throughput sequencing revealed that both MP types reduced the Shannon index and increased the Simpson index of the soil bacterial community. Furthermore, MPs increased the relative abundance of Proteobacteria and Corynebacterium, while decreasing that of Acidobacteria, RB41, and norank_Gemmatimonadaceae, indicating a decline in soil health.

Conclusion

This study demonstrates that PLA-MPs exhibit stronger inhibitory effects on C. fungigraminus growth and physiological processes than PE-MPs, and adversely impact soil nutrient availability and bacterial community structure. These findings provide essential basic data and a scientific foundation for assessing the ecological toxicity of MPs in forage crop systems.