As plastic waste continues to accumulate in natural environments, the impact of aged microplastics (MPs) on soil ecosystems is increasingly becoming a matter of global concern. However, the effects of aged MPs on the stability of water-stable soil aggregates have not been clearly elucidated. Therefore, we investigated the influence of two types of aged MPs, namely, polystyrene and polypropylene, on soil aggregate stability. We found that MPs have a notable effect on the fundamental structural units of soil aggregates, including organic matter and microorganisms. Consequently, reducing the structural stability of soil aggregates by disrupting the bonding mechanisms of soil particles affects the erosion resistance of coarse aggregates. Furthermore, we investigated the coupled effects of "soil electric field-MPs" on aggregate stability. The results showed that the critical potential for aggregate explosive fragmentation corresponds to an electric field intensity at an electrolyte concentration of 10 mol·L. In this study, we have clarified the primary factors through which MPs affect the stability of water-stable soil aggregates, providing new insights for a more accurate assessment of the impact of MPs on soil aggregates.

中文翻译：

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微塑料老化和“微塑料-电场”耦合会影响土壤水稳团聚体的稳定性

随着塑料废物在自然环境中不断积累，老化微塑料（MP）对土壤生态系统的影响日益成为全球关注的问题。然而，老化的 MP 对水稳土壤团聚体稳定性的影响尚未明确阐明。因此，我们研究了两种类型的老化MP，即聚苯乙烯和聚丙烯对土壤团聚体稳定性的影响。我们发现 MP 对土壤团聚体的基本结构单元（包括有机质和微生物）具有显着影响。因此，通过破坏土壤颗粒的结合机制来降低土壤团聚体的结构稳定性会影响粗团聚体的抗侵蚀性。此外，我们研究了“土壤电场-MPs”对聚集体稳定性的耦合影响。结果表明，聚集炸药碎裂的临界电位对应于电解质浓度为10 mol·L时的电场强度。在本研究中，我们阐明了MPs影响水稳土壤团聚体稳定性的主要因素，为更准确地评估MPs对土壤团聚体的影响提供了新的见解。