State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
State Key Laboratory of Metastable Materials Science and Technology, Hebei Key Laboratory of Heavy Metal Deep Remediation in Water and Resource Reuse, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
J Hazard Mater. 2024 Aug 5;474:134768. doi: 10.1016/j.jhazmat.2024.134768. Epub 2024 May 29.
Cadmium (Cd) and microplastics (MPs) gradually increased to be prevalent contaminants in soil, it is important to understand their combined effects on different soil-plant systems. We studied how different doses of polylactic acid (PLA) and polyethylene (PE) affected Cd accumulation, pakchoi growth, soil chemical and microbial properties, and metabolomics in two soil types. We found that high-dose MPs decreased Cd accumulation in plants in red soil, while all MPs decreased Cd bioaccumulation in fluvo-aquic soil. This difference was primarily attributed to the increase in dissolved organic carbon (DOC) and pH in red soil by high-dose MPs, which inhibited Cd uptake by plant roots. In contrast, MPs reduced soil nitrate nitrogen and available phosphorus, and weakened Cd mobilization in fluvo-aquic soil. In addition, high-dose PLA proved detrimental to plant health, manifesting in shortened shoot and root lengths. Co-exposure of Cd and MPs induced the shifts in bacterial populations and metabolites, with specific taxa and metabolites closely linked to Cd accumulation. Overall, co-exposure of Cd and MPs regulated plant growth and Cd accumulation by driving changes in soil bacterial community and metabolic pathways caused by soil chemical properties. Our findings could provide insights into the Cd migration in different soil-plant systems under MPs exposure. ENVIRONMENTAL IMPLICATION: Microplastics (MPs) and cadmium (Cd) are common pollutants in farmland soil. Co-exposure of MPs and Cd can alter Cd accumulation in plants, and pose a potential threat to human health through the food chain. Here, we investigated the effects of different types and doses of MPs on Cd accumulation, plant growth, soil microorganisms, and metabolic pathways in different soil-plant systems. Our results can contribute to our understanding of the migration and transport of Cd by MPs in different soil-plant systems and provide a reference for the control of combined pollution in the future research.
镉 (Cd) 和微塑料 (MPs) 逐渐成为土壤中普遍存在的污染物，了解它们对不同土壤-植物系统的联合作用非常重要。我们研究了不同剂量的聚乳酸 (PLA) 和聚乙烯 (PE) 如何影响两种土壤类型中 Cd 积累、小白菜生长、土壤化学和微生物特性以及代谢组学。我们发现，高剂量 MPs 降低了红壤中植物对 Cd 的积累，而所有 MPs 均降低了 Cd 在潮土中的生物积累。这种差异主要归因于高剂量 MPs 增加了红壤中的溶解有机碳 (DOC) 和 pH 值，从而抑制了植物根系对 Cd 的吸收。相比之下，MPs 降低了土壤硝酸盐氮和有效磷，并减弱了 Cd 在潮土中的迁移。此外，高剂量 PLA 对植物健康有害，表现为缩短了茎叶和根长。Cd 和 MPs 的共暴露诱导了细菌种群和代谢物的变化，特定的分类群和代谢物与 Cd 积累密切相关。总的来说，Cd 和 MPs 的共暴露通过改变土壤化学性质引起的土壤细菌群落和代谢途径的变化来调节植物的生长和 Cd 的积累。我们的研究结果可以为不同土壤-植物系统中 MPs 暴露下 Cd 的迁移提供深入的认识。
微塑料 (MPs) 和镉 (Cd) 是农田土壤中的常见污染物。MPs 和 Cd 的共暴露会改变植物对 Cd 的积累，通过食物链对人类健康构成潜在威胁。在这里，我们研究了不同类型和剂量的 MPs 对不同土壤-植物系统中 Cd 积累、植物生长、土壤微生物和代谢途径的影响。我们的结果有助于我们理解 MPs 在不同土壤-植物系统中对 Cd 的迁移和传输，并为未来研究中联合污染的控制提供参考。
