Han Yanna, Fu Mengru, Yang Yuhe, Zhang Zhiyin, Liu Tianzi, Zhou Shanqi, Qiao Zhihua, Wang Gehui, Peng Cheng, Zhang Wei
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
J Hazard Mater. 2025 May 5;488:137387. doi: 10.1016/j.jhazmat.2025.137387. Epub 2025 Jan 26.
Large-scale plastic wastes annually inevitably induce co-pollution of microplastics (MPs) and novel brominated flame retardants (NBFRs), while gaps remain concerning their effect on terrestrial function. We investigated the impact of polylactic acid (PLA) or polyethylene (PE) MPs after aging in soil-earthworm microcosms under decabromodiphenyl ethane (DBDPE) contamination. MPs altered the food (i.e. soil) of earthworms and affected cast composition, which in turn further affected soil function. After 28 days of exposure, MPs, especially UV-aged MPs, caused the significant enrichment of plastics-degrading bacteria and C/N cycling functions in wormcast, with increased dissolved organic matter consumption after co-exposure (1 % MPs accompanied by 10 mg kg DBDPE). Aging significantly affected soil carbon sequestration, while its effects varied depending on the types of MPs. Notably, soil organic matter was the most impactor affecting wormcast bacteria, highlighting the importance of earthworm's activity on soil carbon. In comparison, PLA-MPs induced stronger responses to the C/N cycling process based on its biodegradable property than PE-MPs, however, aging had a greater effect on PE-MPs due to the formation of oxygen molecules from nothing in the structure. This study expands our current understanding of the interactions of aged MPs and DBDPE in the terrestrial ecosystem. SYNOPSIS: This study highlighted that both MPs before and aging altered the bacterial communities in wormcast and further affected soil ecology during earthworm feeding and excretion.
大规模的塑料垃圾每年不可避免地会导致微塑料（MPs）和新型溴化阻燃剂（NBFRs）的共同污染，而它们对陆地功能的影响仍存在空白。我们研究了在十溴二苯乙烷（DBDPE）污染下，聚乳酸（PLA）或聚乙烯（PE）微塑料在土壤-蚯蚓微观世界中老化后的影响。微塑料改变了蚯蚓的食物（即土壤）并影响了蚓粪组成，进而进一步影响了土壤功能。暴露28天后，微塑料，尤其是紫外线老化的微塑料，导致蚓粪中塑料降解细菌和碳氮循环功能显著富集，共同暴露后溶解有机物消耗增加（1%的微塑料与10 mg kg DBDPE）。老化显著影响土壤碳固存，但其影响因微塑料类型而异。值得注意的是，土壤有机质是影响蚓粪细菌的最主要因素，突出了蚯蚓活动对土壤碳的重要性。相比之下，基于其可生物降解特性，PLA微塑料对碳氮循环过程的响应比PE微塑料更强，然而，由于结构中凭空形成氧分子，老化对PE微塑料的影响更大。本研究扩展了我们目前对老化微塑料与DBDPE在陆地生态系统中相互作用的理解。摘要：本研究强调，微塑料及其老化都改变了蚓粪中的细菌群落，并在蚯蚓摄食和排泄过程中进一步影响土壤生态。
