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不一致的土壤微生物群落和C循环功能对传统和可生物降解的微塑料的反应

Hui Yu¹, Xin Liu¹, Xiaoguo Qiu²

¹National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Taian 271018, Shandong, China.

Journal of hazardous materials

|April 3, 2024

概括

可生物降解的微塑料 (MP),如聚乳酸 (PLA) 和聚乙烯 (PE),显著改变土壤微生物群落和碳循环. PLA,特别是较小的尺寸,通常促进有益的土壤功能,不像PE.

科学领域:

环境科学环境科学
微生物学微生物学
土壤科学土壤科学
聚合物科学聚合物科学

背景情况:

可生物降解的微塑料 (MPs) 正在成为传统塑料的替代品,引发全球关注.
可生物降解的MPs对土壤微生物和生态系统功能的影响仍然不太清楚.
不同的MP类型和大小对土壤健康的不一致影响需要进行详细的研究.

研究的目的:

研究聚乙烯 (PE) 和聚乳酸 (PLA) MPs对土壤微生物群和碳 (C) 循环基因的差异影响.
在土壤条件下分析MP的形态和功能组变化.
确定影响PM对土壤生态系统影响的驱动因素.

主要方法:

使用高通量测序来分析土壤微生物组的组成.
实时定量PCR量化C循环基因.
扫描电子显微镜和里埃变换红外光谱检查了MP形态和功能组.

主要成果:

参与MP降解和循环的不同微生物种群分别被PLA和PE丰富.
与PE相比,PLA,更小的颗粒大小 (150-180微米) 和更高的度 (5%w/w) 提高了土壤网络的复杂性.
酶活动 (β-葡萄糖酶,粉酶) 和特定的C循环基因对PLA和PE的反应不同,受大小和度的影响.

结论:

可生物降解的MP,特别是PLA,对土壤微生物群落和C循环功能产生明显的影响.
土壤pH值,酸盐-含量和MP生物降解性被确定为介导这些影响的关键因素.
结果提供了一个系统的了解可生物降解的MP对土壤生态系统的影响及其对全球气候变化的潜在影响.

关键词:

生物降解的微塑料, 传统的微塑料, 土壤酶活动.碳循环功能的基因碳循环功能的基因微生物社区的微生物社区.

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