花生植物和土壤N固定细菌群落对传统和可生物降解的微塑料的反应
Quanlong Wang1, Xueying Feng1, Yingying Liu1
1College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province 266042, PR China.
Journal of hazardous materials
|July 29, 2023
概括
微塑料 (MP) 影响花生生长和土壤微生物. 可生物降解的聚乳酸 (PLA) MPs显著改变了循环,并丰富了有益的N固定细菌.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 微塑料 (MP) 在农业土壤中普遍存在,引发了对其对土壤植物系统的影响的担忧.
- 关于MPs对豆类及其相关的 (N) 固定微生物群落的具体影响的知识有限.
研究的目的:
- 研究高密度聚乙烯 (HDPE),聚烯 (PS) 和聚乳酸 (PLA) 微塑料对花生生长的影响.
- 分析这些MPs对土壤物理化学性质和花生中N固定细菌群落的影响.
主要方法:
- 花生植物暴露于不同类型 (HDPE,PS,PLA) 和不同剂量的MPs.
- 分析了土壤营养含量 (NO3--N,NH4+-N),酶活性 (尿酶,FDAse),植物N含量和N固定细菌社区结构.
- 评估了根结节,以了解植物适应策略.
主要成果:
- 没有观察到植物毒性影响;PS和PLA在高剂量时甚至增加了植物的高度.
- MPs改变了土壤的形式和酶活动;高剂量的PLA大大减少了NO3--N和增加了尿酶活性.
- 议员们普遍减少了植物N含量,而PLA显示出最重要的影响.
- 国会议员,特别是PLA,改变了N固定细菌社区结构,丰富了Rhizoboales并促进了根结.
结论:
- 微塑料会以与花生类型和剂量有关的方式影响花生-N固定细菌系统.
- 与传统的MP相比,像PLA这样的可生物降解的MP可能对的生物地球化学循环产生更大的影响.
- 在PLA污染下观察到的根结结表明植物对缺乏的适应性反应.
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