Microbial metabolism in wormcast affected the perturbation on soil organic matter by microplastics under decabromodiphenyl ethane stress

IF 11.3 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Hazardous Materials Pub Date : 2025-01-26 DOI:10.1016/j.jhazmat.2025.137387

Yanna Han , Mengru Fu , Yuhe Yang , Zhiyin Zhang , Tianzi Liu , Shanqi Zhou , Zhihua Qiao , Gehui Wang , Cheng Peng , Wei Zhang

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引用次数: 0

Abstract

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⁻¹ 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.

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十溴二苯乙烷胁迫下微塑料对土壤有机质扰动的影响

每年大量的塑料垃圾不可避免地引起微塑料（MPs）和新型溴化阻燃剂（NBFRs）的共同污染，但它们对陆地功能的影响仍存在空白。研究了十溴二苯乙烷（DBDPE）污染下土壤-蚯蚓微观环境中聚乳酸（PLA）或聚乙烯（PE） MPs老化后的影响。多磺酸粘多糖改变了蚯蚓的食物（即土壤），影响了土壤成分，进而进一步影响了土壤功能。暴露28天后，MPs，特别是uv老化的MPs，引起虫体内塑料降解细菌和C/N循环功能的显著富集，并增加了共暴露（1% MPs伴随着10 mg kg-1 DBDPE）后的溶解有机质消耗。老化对土壤固碳有显著影响，但其影响因土壤粘多糖类型而异。值得注意的是，土壤有机质对蚯蚓寄生菌的影响最大，这凸显了蚯蚓活动对土壤碳的重要性。相比之下，PLA-MPs基于其可生物降解的特性比PE-MPs对C/N循环过程的响应更强，然而，老化对PE-MPs的影响更大，因为在结构中从无开始形成氧分子。这项研究扩展了我们目前对陆地生态系统中衰老MPs和DBDPE相互作用的理解。本研究强调，MPs前和老化都改变了蚯蚓粪便中的细菌群落，并进一步影响了蚯蚓摄食和排泄过程中的土壤生态。

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来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.