School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 430000, China.
Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan Province, Zhengzhou, 430000, China.
Sci Rep. 2024 Feb 29;14(1):4962. doi: 10.1038/s41598-024-54838-8.
Microplastics are exotic pollutants and are increasingly detected in soil, but it remains poorly understood how microplastics impact soil and plant systematically. The present study was conducted to evaluate the effects of polyvinyl chloride microplastics (PVC-MPs) on wheat seedlings performance and soil properties. Under the stress of PVC-MPs, no new substance and functional groups were generated in soil by X-ray diffraction and the fourier transform infrared spectroscopy analyses, whereas the diffraction and characteristic peaks and of soil was affected by PVC-MPs. Wheat seedlings shoot biomass and soil nitrate nitrogen were significantly inhibited by PVC-MPs. Chlorophylls were not significant affected by PVC-MPs. Superoxide dismutase, catalase, and peroxidase activities in wheat seedlings increased, while malondialdehyde and proline contents decreased significantly. Redundancy analysis displayed that wheat seedlings traits can be largely explained by soil nitrate nitrogen. Our results indicate that PVC-MPs have more significant influence on soil structure than on soil substance composition. Moreover, even though antioxidant enzyme activities were improved to respond the stress of PVC-MPs, wheat seedlings are not severely impacted by PVC-MPs. Besides, soil nitrate nitrogen is the main factor on wheat seedlings performance and wheat seedlings are prone to ensure the root growth under the stress of PVC-MPs.
微塑料是一种外来污染物，在土壤中越来越多地被检测到，但人们对微塑料如何系统地影响土壤和植物知之甚少。本研究旨在评估聚氯乙烯微塑料 (PVC-MPs) 对小麦幼苗性能和土壤性质的影响。在 PVC-MPs 的胁迫下，X 射线衍射和傅里叶变换红外光谱分析并未在土壤中产生新的物质和官能团，而 PVC-MPs 影响了土壤的衍射和特征峰。PVC-MPs 显著抑制了小麦幼苗地上生物量和土壤硝态氮。叶绿素受 PVC-MPs 影响不显著。小麦幼苗中超氧化物歧化酶、过氧化氢酶和过氧化物酶活性增加，而丙二醛和脯氨酸含量显著降低。冗余分析显示，小麦幼苗的特性可以很大程度上用土壤硝态氮来解释。我们的结果表明，PVC-MPs 对土壤结构的影响大于对土壤物质组成的影响。此外，尽管抗氧化酶活性提高以应对 PVC-MPs 的胁迫，但 PVC-MPs 对小麦幼苗的影响并不严重。此外，土壤硝态氮是影响小麦幼苗性能的主要因素，小麦幼苗在 PVC-MPs 的胁迫下更容易保证根的生长。
