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Article Abstract
Di-(2-ethylhexyl) phthalate (DEHP), a ubiquitous agricultural plasticizer, readily leaches into soils. Earthworm-mediated DEHP biodegradation and microplastics (MPs) co-contamination effects on vermicomposting remain uncharacterized. This study evaluated DEHP biodegradation and metabolic pathways in polyethylene microplastic-added soil under earthworm activity. Both epigeic and endogeic ecotypes of earthworms significantly accelerated DEHP degradation. In the treatment without microplastics, the highest degradation efficiency was 72.29 % by endogeic Pheretima guillelmi, while in the treatment with added microplastics, the degradation rate was up to 51.09 %. It was attributing to the increasing soil pH and humus (FA, HA, HM), and the elevated abundance of potential DEHP-degradation microorganisms (Sphingomonas, Lysobacter, and Flavobacterium) and genes (fadA, paaH, and ACAT). Particularly, vermicomposting improved anaerobic benzoyl-CoA degradation pathway, in which Sphingomonas, Lysobacter, and Flavobacterium might carry fadA, paaH, and ACAT genes. Polyethylene-MPs significantly delayed DEHP degradation to 18.48 % in soils without earthworms and 51.09 % in vermicomposting treatments by reducing the abundance of DEHP-degrading microorganisms and genes. Findings revealed polyethylene-MPs effects on earthworm-mediated DEHP degradation and guided agricultural soil management strategies.
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| http://dx.doi.org/10.1016/j.ecoenv.2025.118655 | DOI Listing |
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