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传统和可生物降解微塑料对土壤-大豆系统的影响:关于树根球微生物群落和土壤元素循环的观点

Tianjiao Song¹, Jiaxi Liu¹, Siqi Han¹

¹College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.

Environment international

|June 16, 2024

概括

像PBAT和PLA这样的可生物降解微塑料 (MP) 比传统的LDPE MP更严重地破坏大豆生长和土壤营养. 这些MP改变了土壤微生物群落和元素循环,影响了植物的发展.

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) 是新出现的污染物,影响土壤生态系统.
可生物降解的MP可能对土壤微生物群落和营养循环产生明显的风险.
关于不同类型的MP对土壤植物系统的影响的研究有限.

研究的目的:

评估传统的低密度聚乙烯 (LDPE),可生物降解的聚乙烯基甲基甲基甲酸盐 (PBAT) 和聚乳酸 (PLA) MPs对大豆生长的影响.
研究这些MPs对土壤微生物群落和碳,,和硫 (CNPS) 循环的影响.
为了确定MP特性,土壤微生物变化,营养素可用性和植物健康之间的关系.

主要方法:

使用土壤-大豆系统进行现场研究.
用于LDPE,PBAT和PLA微塑料的应用.
分析大豆生长参数 (射,射生物质).
测量土壤中溶解的有机碳 (DOC) 和酸 (NO3-N).
评估根球微生物群落组成和与CNPS循环相关的功能基因.
包括相关性和冗余分析在内的统计分析.

主要成果:

与LDPE-MP相比,PBAT-MP和PLA-MP显著减少了大豆芽和生物质.
PBAT-MPs和PLA-MPs增加了土壤的DOC,并降低了NO-N水平.
可生物降解的MPs (PBAT,PLA) 促进了复制型细菌和抑制了寡质型细菌,增强了CNPS循环基因.
LDPE-MPs倾向于丰富寡质细菌并降低CNPS循环基因.
土壤NO3的可用性被确定为大豆生长的主要限制因素.

结论:

可生物降解的MP (PBAT,PLA) 对土壤健康和大豆生长的影响比传统的LDPEMP更为有害.
微塑料的降解特性有选择性地改变土壤微生物群落和营养循环,对的可用性有重大影响.
了解这些MP-土壤-植物相互作用对于评估生态风险和开发可持续农业实践至关重要.

关键词:

在CNPS循环运行.功能性基因是指功能性的基因.微塑料是一种微塑料.树枝球微生物群体社区.土壤元素循环的循环.

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