Degradation of Biodegradable Mulch-Derived Microplastics and Their Effects on Bacterial Communities and Radish Growth in Three Vegetable-Cultivated Purple Soils

文献类型： 外文期刊

第一作者： Ao, Ruixue

作者： Ao, Ruixue;Liu, Zexian;Chen, Jiaxin;Zhao, Xiulan;Mu, Yue

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关键词： biodegradable microplastics; polyethylene microplastics; soil properties; bacterial community; radish growth

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.6； 五年影响因子：3.8 ）

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年卷期： 2025 年 15 卷 14 期

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收录情况： SCI

摘要： Biodegradable mulch films (BDMs) are considered a promising solution for mitigating plastic residue pollution in agroecosystems. However, the degradation behavior and ecological impacts of their residues on soil-plant systems remain unclear. Here, a pot experiment was conducted using an acidic purple soil (AS), a neutral purple soil (NS), and a calcareous purple soil (CS) to investigate the degradation of 1% (w/w) microplastics derived from polyethylene mulch film (PE-MPs) and polybutylene adipate terephthalate/polylactic acid (PBAT/PLA) mulch film (Bio-MPs), as well as their effects on soil properties, bacterial communities, and radish growth. PE-MPs degraded slightly, while the degradation of Bio-MPs followed the order of NS > CS > AS. PE-MPs and Bio-MPs enhanced the nitrification and radish growth in AS but had no significant effects on soil properties and radish growth in CS. Bio-MPs notably increased the relative abundance of PBAT/PLA degradation-related bacteria, such as Ramlibacter, Bradyrhizobium, and Microbacterium, across the three soils. In NS, Bio-MPs raised soil pH and enriched nitrogen-fixing and denitrifying bacteria, leading to a decrease in NO3--N content and radish biomass. Overall, the effects of Bio-MPs on soil-plant systems varied with soil properties, which are closely related to their degradation rates. These findings highlight the need to assess the ecological risks of BDM residues before their large-scale use in agriculture.

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