在棉花根球土壤中,PE微塑料改变了微生物资源的限制和C/N使用效率
Yudong Chen1, Xiaotong Li1, Yulin Shu2
1College of Ecology and Environment, Xinjiang University, Urumqi 830017, China; Key Laboratory of Oasis Ecology of Education Ministry, Xinjiang University, Urumqi 830017, China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Jinghe 833300, China.
Journal of hazardous materials
|January 28, 2026
概括
聚乙烯微塑料 (PE MPs) 破坏了棉花中的土壤营养平衡和微生物代谢. MP的大小和度改变了碳和循环,影响了土壤生态系统功能和微生物效率.
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:
- 聚乙烯微塑料 (PE MP) 是普遍存在的环境污染物.
- 它们对土壤生态系统功能的影响,特别是树根球微生物代谢和资源分割,在机理上仍然不清楚.
研究的目的:
- 调查PE MPs在尺寸和度上有所不同,如何影响棉花根球土壤中的碳 (C) 和 (N) 循环,酶活动和微生物特征.
- 阐明MPs改变土壤静态度平衡和微生物代谢效率的机制.
主要方法:
- 在棉花根球土壤中对PE MP大小 (千米尺度与微观尺度) 和度的实验性操纵.
- 对土壤C和N池 (SOC,DOC,STN,NH4+,NO3-),细胞外酶活动 (例如β-葡萄糖酶,酸酶),微生物生物量 (MBC,MBN) 和基因表达的分析.
- 结构方程建模 (SEM) 的应用,以确定微生物代谢效率的关键驱动因素.
主要成果:
- PE MP 破坏了土壤 C:N 固态度,增加了土壤有机碳 (SOC) 和溶解的有机碳 (DOC),同时减少了可用的 N 形式 (STN,NH4+,NO3-).
- 微生物代谢转向N限制;低MP度加剧了N限制,而高度减轻了C限制.
- 微生物分子粒子大小显著影响了微生物效率:较小的MP提高了C使用效率 (CUE),但降低了N使用效率 (NUE) 和脱基因表达,而较大的MP降低了微生物生物质.
结论:
- PE MPs通过改变土壤固体测量平衡和调节微生物功能基因表达,对树叶球代谢效率施加双重调节机制.
- 根据MP的大小和度,它会重新配置资源-酶-社区网络,影响营养动态和微生物代谢.
- 这些发现为评估农业微塑料的生态风险和制定精确管理策略提供了理论基础.
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