College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province 266042, PR China.
College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province 266042, PR China.
J Hazard Mater. 2023 Jan 15;442:130102. doi: 10.1016/j.jhazmat.2022.130102. Epub 2022 Oct 1.
Both microplastics (MPs) and cadmium (Cd) are common contaminants in soil-rice systems, but their combined effects remain unknown. Thereby, we explored the effects of three MPs, i.e., polyethylene terephthalate (PET), polylactic acid (PLA), and polyester (PES), on Cd accumulation in rice and the community diversity and structure of arbuscular mycorrhizal fungi (AMF) in soil spiked with or without Cd. Results showed that 2% PLA decreased shoot biomass (-28%), but PET had a weaker inhibitive effect. Overall, Cd alone did not significantly change shoot and root biomass and increased root biomass in combination with 0.2% PES. MPs generally increased soil Cd availability but decreased Cd accumulation in rice tissues. Both MPs and Cd improved the bioavailability and uptake of Fe and Mn in rice roots. MPs altered the diversity and community composition of AMF, depending on their type and dose and co-existing Cd. Overall, 2% PLA caused the most distinct changes in soil properties, plant growth and Cd accumulation, and AMF communities, but showed no synergistic interactions with Cd. In conclusion, MPs can mediate rice performance and Cd accumulation via altering soil properties, nutrient uptake, and root mycorrhizal communities, and biodegradable PLA MPs thought environment-friendly can exhibit higher phytotoxicity than conventional MPs.
微塑料（MPs）和镉（Cd）都是土壤-水稻系统中的常见污染物，但它们的联合效应尚不清楚。因此，我们研究了三种 MPs，即聚对苯二甲酸乙二醇酯（PET）、聚乳酸（PLA）和聚酯（PES），对土壤中添加或不添加 Cd 时水稻中 Cd 积累的影响，以及土壤中丛枝菌根真菌（AMF）的群落多样性和结构。结果表明，2%的 PLA 降低了地上生物量（-28%），但 PET 的抑制作用较弱。总体而言，单独的 Cd 并没有显著改变地上和地下生物量，反而与 0.2%的 PES 结合增加了根生物量。 MPs 通常会增加土壤中 Cd 的有效性，但会降低水稻组织中 Cd 的积累。 MPs 和 Cd 都提高了水稻根系中 Fe 和 Mn 的生物有效性和吸收。 MPs 改变了 AMF 的多样性和群落组成，这取决于它们的类型、剂量和共存的 Cd。总的来说，2%的 PLA 对土壤性质、植物生长和 Cd 积累以及 AMF 群落的影响最为明显，但与 Cd 没有协同作用。总之， MPs 可以通过改变土壤性质、养分吸收和根际菌根群落来调节水稻的性能和 Cd 的积累，而且可生物降解的 PLA MPs 虽然被认为是环保的，但表现出比传统 MPs 更高的植物毒性。
