Microplastics (MPs) as a type of emerging contaminant in the environment have attracted extensive attentions in recent years, and understanding the impacts of MPs on soil biodiversity and functioning are thus increasingly urgent. Nevertheless, few studies were performed to investigate potential effects of MPs on decay of soil organic pollutants in particular pesticides and enzyme activities. Herein, three types of MPs including polystyrene fragments (PS-50) and polyvinyl chloride beads (PVC-42000 and PVC-10) were added to soil at environmentally relevant concentrations (0.2 and 1.0%) to study their impacts on dissipation of thiacloprid and activities of urease, acid phosphatase, invertase and catalase. MPs exhibited negligible impacts on thiacloprid dissipation regardless of MPs type and content, being probably attributed to the unaltered bioavailability of thiacloprid in soil even after an addition of MPs, which was documented by using the hydroxypropyl-β- cyclodextrin (HPCD) extraction method. Batch sorption experiments also exhibited the comparable adsorption capacity of thiacloprid to soil with and without MPs, along with K_f valuses of 3.44–3.77. Besides, MPs exerted negligible effects on enzyme activities of soil. Taken together, this study showed negligible impacts of MPs at environmentally relevant concentrations on thiacloprid dissipation and enzyme activity, expanding our knowledge on impacts of MPs at the environmentally relevant concentrations on pesticide dissipation in soil.

近年来，作为环境中一种新兴污染物的微塑料（MPs）引起了广泛关注，因此越来越迫切需要了解MPs对土壤生物多样性及其功能的影响。然而，很少进行研究来研究MPs对土壤有机污染物，特别是农药和酶活性的衰减的潜在影响。在本文中，以与环境相关的浓度（0.2％和1.0％）向土壤中添加了三种类型的MP，包括聚苯乙烯片段（PS-50）和聚氯乙烯珠（PVC-42000和PVC-10），以研究它们对噻虫啉和噻虫啉消散的影响。尿素酶，酸性磷酸酶，转化酶和过氧化氢酶的活性。无论MP的类型和含量如何，MP对噻虫啉的耗散影响微不足道，这可能归因于即使添加MP后噻虫啉在土壤中的生物利用度也没有改变，这是通过使用羟丙基-β-环糊精（HPCD）提取方法证明的。分批吸附实验还显示了噻虫啉对有或无MP的土壤的吸附能力，以及K _f值为3.44–3.77。此外，国会议员对土壤酶活性的影响可忽略不计。两者合计，这项研究表明环境相关浓度的MPs对噻虫啉消散和酶活性的影响可忽略不计，扩大了我们对环境相关浓度的MPs对土壤农药消散的影响的认识。