聚乙烯和可生物降解的微塑料对不同土地使用类型的土壤有机碳分量的老化影响的机制
Haixin Zhang1, Yimei Huang1, Jikai Shen1
1Key Laboratory of Plant Nutrition and The Agri-environment in Northwest China, Ministry of Agriculture, Key Laboratory of Low-carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, College of Natural Resources and Environment, Northwest A&F University, 712100, Shaanxi, China.
The Science of the total environment
|December 2, 2023
概括
微塑料 (MPs) 加快土壤的老化,影响土壤有机碳 (SOC) 分数,如颗粒有机碳 (POC) 和真菌死体碳 (FNC). 基的剂量和土地使用类型影响这些变化,影响土壤碳池.
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) 在陆地生态系统中普遍存在.
- 对于各种土地使用类型的MP老化及其对土壤有机碳 (SOC) 分数的影响的了解有限.
研究的目的:
- 研究聚乙烯 (PE) 和可生物降解的MPs (Bio-MPs) 在草原,农田和设施土壤中的老化特性.
- 评估MPs对土壤各种有机碳分量的影响,包括SOC,POC,MAOC和微生物衍生的碳.
- 探索MP剂量,老化和土壤碳动态之间的关系.
主要方法:
- 在草地,农田和设施土壤上用PE和Bio-MPs在不同剂量 (0%,0.03%,0.3%w/w) 进行8周的化.
- 使用碳基指数 (CI) 来量化MP老化.
- 对土壤有机碳 (SOC),有机颗粒碳 (POC),矿物相关有机碳 (MAOC) 和微生物衍生的碳进行分析.
主要成果:
- 农田和设施土壤中的PE-MPs的CI值显著增加.
- 可生物降解的MPs在草地土壤中表现出最显著的老化.
- MP剂量与CI负相关;PE-MPs降低了SOC和POC含量,特别是在草原和设施土壤中.
- 在草原和农田土壤中,PE和Bio-MPs降低了真菌死体C (FNC).
- MP剂量通过土壤pH,营养素和酶活性影响了FNC,最终影响了土壤C池.
结论:
- 微塑料显著改变了陆地生态系统中的土壤有机碳动态.
- MP老化及其对土壤碳分量的影响受MP类型,剂量和土地使用类型的影响.
- MPs影响土壤微生物酶活性和真菌死体,导致土壤整体碳池的变化.
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