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传统和可生物降解的皮膜中的微塑料会改变农田土壤中的微生物死体积累和有机碳捕获

Haixin Zhang¹, Junfeng Zhao², Yimei Huang³

¹School of Plant Protection and Environment, Henan Institute of Science and Technology, Xinxiang, 453003, China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Ministry of Agriculture and Rural Affairs, College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, China.

Environmental pollution (Barking, Essex : 1987)

|September 11, 2025

概括

来自皮膜的微塑料改变了土壤碳动态. 虽然最初减少微生物死体碳,但老化微塑料最终会增加土壤有机碳和微生物死体碳,特别是传统的聚乙烯类型.

科学领域:

环境科学环境科学
土壤科学土壤科学
生态生态学生态生态学

背景情况:

微塑料 (MP) 是普遍存在的污染物,可能对土壤有机碳 (SOC) 和全球变化产生影响.
农田土壤中膜衍生MP的老化过程及其对微生物死体碳 (MNC) 形成的影响尚不清楚.

研究的目的:

调查聚乙烯 (PE) 和可生物降解 (Bio) 皮膜衍生MPs在农田土壤中的老化行为.
确定这些老年MP对微生物死体碳 (MNC) 和土壤有机碳 (SOC) 积累的影响机制.

主要方法:

聚乙烯 (PE) 和生物降解 (Bio) 皮膜衍生的MP被添加到农田土壤中,占0.2% (w/w).
土壤被化了120天,每30天收集一次样本.
分析了MP和土壤碳池 (MNC,MBC,DOC,SOC) 的表面化学变化.

主要成果:

在第120天,MP老化导致表面C-H/C-C键的减少 (PE-MPs:12.2%,生物-MPs:3.7%).
最初 (前60天),国会议员减少了细菌死体碳 (BNC) 和MNC.
后来 (90-120天),与对照土壤相比,MP显著增加了微生物生物质碳 (MBC),溶解有机碳 (DOC),MNC和SOC.
这些增加与MP老化,营养物质可用性变化,酶活动以及促进DOC和微生物生物质有关.

结论:

皮膜衍生的MPs,特别是传统的PE-MPs,显著影响农田土壤中MNC积累和SOC封存.
微生物群的老化通过改变微生物群的功能和死体循环,影响了土壤碳动态.
了解这些影响对于评估农业中塑料料的环境风险至关重要.

关键词:

微生物碳的有效性微生物碳的有效性微生物的死体.微塑料是一种微塑料.土壤有机碳土壤有机碳

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