农业土壤中的有机碳损失由可生物降解的微塑料加速,并通过矿物添加减轻
Rachel Wooliver1, Avishesh Neupane1, Jennifer M DeBruyn1
1Department of Biosystems Engineering & Soil Science, University of Tennessee, Knoxville, Tennessee, USA.
Journal of environmental quality
|January 21, 2026
概括
可生物降解的微塑料,如PLA/PHA,可以通过原始化效应显著耗尽土壤有机碳 (SOC). 添加气并没有改变这些效应,这表明可生物降解塑料威胁到土壤碳储存.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 农业薄膜中的微塑料积聚在土壤中,影响土壤有机碳 (SOC) 储存.
- 可生物降解的微塑料对原生SOC矿化和 (N) 的作用的原始效应尚不清楚.
研究的目的:
- 研究可生物降解微塑料 (PBS,PLA,PLA/PHA) 和LDPE在农业土壤上的降解和原始化效应.
- 评估低和高条件对微塑料降解和SOC动态的影响.
主要方法:
- 进行了一项为期193天的土壤化实验.
- 使用C同位素追踪来量化微塑料和原生SOC的碳损失.
- 三种生物降解微塑料 (PBS,PLA,PLA/PHA) 和一种常规微塑料 (LDPE) 进行了测试.
主要成果:
- PLA/PHA显示出最大的塑料-C损失 (17.88%) 和诱导最大的积极原始效应 (371μg Cg干土-1).
- PLA,PBS和LDPE表现出<1%的塑料-C损失,具有不同的原始化效应 (积极到消极).
- 添加气减少了总碳损失,但没有改变原始化效应;原始化与溶解的有机碳,微生物生物质碳,酶活动和pH正相关.
结论:
- 可生物降解的微塑料,特别是PLA/PHA,对土壤中的有机碳池构成威胁.
- 更高的含量可能会增加可生物降解塑料在土壤中的持久性,这可能会影响土壤的长期健康.
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