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揭示可生物降解的多乳酸微塑料对草地土壤健康的影响

Shuming Liu^1,2,3, Binglin Chen¹, Kaili Wang¹

¹School of Resources and Environment, Yili Normal University, Yining, 835000, China.

Environmental geochemistry and health

|January 8, 2025

概括

可生物降解的多乳酸微塑料 (PLA-MPs) 通过改变pH值,营养素和酶活动影响草原土壤. 颗粒的大小和度显著影响这些土壤变化和微生物社区结构.

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:

土壤微塑料 (MP) 污染越来越令人担忧,特别是农业中使用的可生物降解塑料.
在草地土壤生态系统中,聚乳酸微塑料 (PLA-MPs) 的生态影响尚不清楚.

研究的目的:

研究PLA-MPs对土壤物理化学特性,酶活性和微生物群落的影响.
为了确定不同的颗粒大小和PLA-MPs度如何影响这些土壤参数.

主要方法:

通过使用不同颗粒大小和度的PLA-MP进行了为期60天的土壤化实验.
分析了土壤的物理化学特性,酶活性 (S-SOD,S-POD,S-CAT,S-β-GC,S-UE,S-ALP) 和微生物群落组成.
通过对未观察到状态的重建对社区的族群遗传学研究 (PICRUSt2) 用于评估代谢途径的修改.

主要成果:

酸增加了土壤的pH值,有机物质,总和可用的.
增强了S-SOD,S-POD,S-CAT,S-β-GC和S-UE的活动,而S-ALP活动则下降.
较大的PLA-MP颗粒大小对物理化学性质产生了更大的影响,而较小的颗粒对酶活动的影响更大.
PLA-MPs改变了微生物群落结构,增加了Acidobacteriota,Chloroflexi和Gemmatimonadota,并减少了Proteobacteria,Actinobacteriota和Patescibacteria. 这种微生物群落的结构发生了变化.
微生物群落的变化与土壤特性如pH,AK,S-UE和S-β-GC的变化有关.

结论:

PLA-MP 颗粒的大小和度对土壤营养含量,酶活动以及微生物群落结构和功能有不同的影响.
更大的颗粒大小和更高的PLA-MP度通常会对草地土壤生态系统产生更明显的影响.
PLA-MPs可以修改细菌的代谢途径,表明土壤微生物群的功能转变.

关键词:

酶活性的酶活动.草地土壤草地土壤微生物社区的微生物社区.微塑料是一种微塑料.

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