微塑料和酸雨对土壤化学特性,酶活性和细菌群落的影响
Xin Zhang1, Yanna Zhao2, Jing Lv3
1College of Environmental and Safety Engineering, Fuzhou University, Fuzhou, Fujian 350108, China; Fujian Provincial Key Laboratory of Resources and Environmental Monitoring and Sustainable Management and Utilization, Sanming University, Sanming, Fujian 365004, China; Medical Plant Exploitation and Utilization Engineering Research Center, Sanming University, Sanming, Fujian 365004, China.
Ecotoxicology and environmental safety
|January 28, 2026
概括
微塑料 (MPs) 与酸雨 (AR) 结合,改变了土壤的和微生物群落. 聚乳酸 (PLA) 微塑料减少了细菌的多样性,在低酸雨条件下,这种影响会恶化.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生态毒理学 生态毒理学
背景情况:
- 微塑料 (MP) 污染对土壤生态系统产生影响,但与酸雨 (AR) 结合的影响还没有得到充分研究.
- 研究常见MP (LDPE,PLA) 和AR之间的相互作用对于了解土壤健康风险至关重要.
研究的目的:
- 评估LDPE和PLA微塑料与不同的酸雨水平对土壤特性,酶活动和细菌群落的联合影响.
- 为了确定由微塑料-酸雨相互作用影响的关键土壤因素和微生物反应.
主要方法:
- 在不同的酸雨处理下,用LDPE和PLA微塑料试验化土壤.
- 分析土壤的物理化学特性 (pH,可用的,有机碳).
- 对土壤酶活性 (酸酸酶,β-D-葡萄糖酶) 的测定.
- 16S rRNA基因测序用于细菌社区结构和多样性分析.
- 冗余分析以确定微生物群落的关键环境驱动因素.
主要成果:
- 微塑料显著改变了可用的含量,但对土壤pH的影响很小.
- 2%的PLA增加了土壤有机碳和酸酸酶活性;AR没有进一步增强酸酸酶.
- 酸雨显著刺激β-D-葡萄糖酶的活性,不论微塑料的存在.
- 现有的和酸酸酶被确定为微生物社区结构的关键驱动因素.
- 2%的PLA降低了细菌α多样性和改变了社区组成,低AR水平加剧了这种情况.
- 微塑料处理转移了细菌类 (增加了蛋白质细菌,减少了Firmicutes) 和属 (增加了Bradyrhizobium,Paraburkholderia;减少了Sinomonas).
结论:
- 微塑料,特别是PLA,可以显著改变土壤的生物地球化学特性和微生物群落,特别是与酸雨相结合.
- 微塑料和酸雨的联合压力对土壤健康构成复杂的风险,影响营养循环和微生物多样性.
- 调查结果强调,在对微塑料污染环境的风险评估中需要考虑组合污染物影响,特别是受酸雨影响的环境.
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