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Effects of microplastics on microbial community structure and wheatgrass traits in Pb-contaminated riparian sediments under flood-drainage-planting conditions

Journal of Hazardous Materials 2024 21 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 65 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Si Liu, Wenjuan He, Wenjuan He, Si Liu, Si Liu, Wenjuan He, Jinying Hu, Jinying Hu, Wenjuan He, Wenjuan He, Wenjuan He, Jinhui Huang, Jinhui Huang, Wenjuan He, Jinhui Huang, Jinhui Huang, Jinhui Huang, Wenjuan He, Jinhui Huang, Jinhui Huang, Wei Zhang, Wenjuan He, Lixiu Shi, Wenjuan He, Si Liu, Wenjuan He, Wenjuan He, Lixiu Shi, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Jinying Hu, Lixiu Shi, Wenjuan He, Enjie Li, Jinying Hu, Lixiu Shi, Wenjuan He, Wenjuan He, Wenjuan He, Lixiu Shi, Haoliang Pang Wei Zhang, Jinying Hu, Enjie Li, Jinying Hu, Enjie Li, Jinhui Huang, Haoliang Pang Enjie Li, Haoliang Pang Enjie Li, Enjie Li, Enjie Li, Jinying Hu, Jinying Hu, Jinying Hu, Jinying Hu, Jinying Hu, Jinying Hu, Lixiu Shi, Jinying Hu, Lixiu Shi, Haoliang Pang Jinying Hu, Haoliang Pang Haoliang Pang Si Liu, Jinhui Huang, Chenyu Zhang, Haoliang Pang Haoliang Pang Haoliang Pang Haoliang Pang Si Liu, Haoliang Pang Wenjuan He, Wenjuan He, Enjie Li, Haoliang Pang

Summary

Researchers studied how polyethylene and biodegradable PLA microplastics interact with lead contamination in river sediments under simulated flood-drainage-planting conditions. Both types of microplastics altered the microbial communities in the sediment and affected how much lead was available to plants, with higher concentrations of microplastics generally increasing lead uptake by wheatgrass. This shows how microplastics in contaminated waterways can amplify the movement of heavy metals into plants and potentially into the food chain.

Polymers

PE PLA

Study Type Environmental

The coexistence of microplastics (MPs) and heavy metals in sediments has caused a potential threat to sediment biota. However, differences in the effects of MPs and heavy metals on microbes and plants in sediments under different sediment conditions remain unclear. Hence, we investigated the influence of polyethylene (PE) and polylactic acid (PLA) MPs on microbial community structure, Pb bioavailability, and wheatgrass traits under sequential incubation of sediments (i.e., flood, drainage, and planting stages). Results showed that the sediment enzyme activities presented a dose-dependent effect of MPs. Besides, 10 % PLA MPs significantly increased the F1 fractions in three stages by 11.13 %, 30.10 %, and 17.26 %, respectively, thus resulting in higher Pb mobility and biotoxicity. MPs altered sediment bacterial composition and structures, and bacterial community differences were evident in different incubation stages. Moreover, the co-exposure of PLA MPs and Pb significantly decreased the shoot length and total biomass of wheatgrass and correspondingly activated the antioxidant enzyme activity. Further correlation analysis demonstrated that community structure induced by MPs was mainly driven by sediment enzyme activity. This study contributes to elucidating the combined effects of MPs and heavy metals on sediment ecosystems under different sediment conditions.

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