可生物降解的聚合物促进了土虫Eisenia fetida的繁殖
Anja Holzinger1, Linda Hink2, Elmar Sehl3
1Animal Population Ecology, Animal Ecology I, University of Bayreuth, Universitätstrasse 30, 95447 Bayreuth, Germany.
The Science of the total environment
|June 8, 2023
概括
像PLLA和PCL这样的可生物降解的微塑料增强了的繁殖和改变了肠道微生物,而PP提高了的体重. 用PLLA和PCL降低了土壤pH值,但没有观察到任何不良影响.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 土壤科学 土壤科学
背景情况:
- 微塑料污染对陆地生态系统构成全球威胁,影响土壤健康和生物.
- 可生物降解聚合物的环境影响,越来越多地被用作传统塑料的替代品,并未得到充分理解.
- 虫是重要的土壤生态系统工程师,对环境变化敏感.
研究的目的:
- 研究传统 (聚乙烯,PET,PP) 和可生物降解 (PLLA,PCL) 微塑料对土Eisenia fetida的影响.
- 评估对虫体重增加,生殖成功和肠道微生物群体的影响.
- 评估土壤性质的变化,特别是pH值和阴离子交换能力.
主要方法:
- 土虫 (Eisenia fetida) 被暴露在人工土壤中,用1%和2.5% (w/w) 的常规和可生物降解微塑料修改了8周.
- 测量了虫体重和繁殖 (子,幼虫) 的直接影响.
- 分析了包括肠道微生物组成和短链脂肪酸生产在内的间接影响.
- 测定了土壤的pH值和阴离子交换能力.
主要成果:
- 可生物降解的多乳酸 (PLLA) 和多 (PCL) 显著增加了子生产 (分别为135%和54%) 和化幼.
- PLLA和PCL改变了地肠道微生物的β-多样性,增加了乳酸生产.
- 聚烯 (PP) 对的体重和繁殖成功产生了积极的影响.
- 在PLLA和PCL的存在下,土壤pH值下降约1.5个单位.
- 对于任何微塑料类型,在研究的终点上都没有观察到任何不良影响.
结论:
- 微塑料的影响取决于聚合物类型,可生物降解的聚合物对具有有益或中性影响.
- 虫肠道微生物群可能会增强可生物降解聚合物的降解,潜在地将其作为碳来源.
- 需要进一步的研究,才能充分理解可生物降解的微塑料在土壤生态系统中的相互作用的长期影响.
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