College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, China.
Environ Pollut. 2022 Sep 15;309:119817. doi: 10.1016/j.envpol.2022.119817. Epub 2022 Jul 21.
The extensive application of nanomaterials has increased their levels in soil environments. Therefore, clarifying the process of environmental migration is important for environmental safety and human health. In this study, alfalfa was used to determine the effects of different doses of ZnO nanoparticles (NPs) on the growth of alfalfa and the soil environment. Results showed that the alfalfa biomass was inversely proportional to the exposure concentration of ZnO NPs. The Zn concentration in the alfalfa tissue and the exposure dose presented a significant positive correlation. A high concentration of ZnO NPs decreased the nitrogen-fixing area of root nodules while the number of bacteroids and root nodules, which in turn affected the nitrogen-fixing ability of alfalfa. At the same time, it caused different degrees of damage to the root nodules and root tip cells of alfalfa. A high dose of ZnO NPs decreased the relative abundance and diversity of the soil microorganisms. Therefore, short-term and high-dose exposure of ZnO NPs causes multiple toxicities in plants and soil environments.
纳米材料的广泛应用增加了它们在土壤环境中的含量。因此，阐明环境迁移过程对于环境安全和人类健康非常重要。本研究采用紫花苜蓿来确定不同剂量的氧化锌纳米粒子（NPs）对紫花苜蓿生长和土壤环境的影响。结果表明，紫花苜蓿的生物量与 ZnO NPs 的暴露浓度呈反比。紫花苜蓿组织中的 Zn 浓度与暴露剂量呈显著正相关。高浓度的 ZnO NPs 降低了根瘤固氮区的面积，而根瘤菌和根瘤的数量则反过来影响了紫花苜蓿的固氮能力。同时，它对紫花苜蓿的根瘤和根尖细胞造成了不同程度的损伤。高剂量的 ZnO NPs 降低了土壤微生物的相对丰度和多样性。因此，ZnO NPs 的短期和高剂量暴露会对植物和土壤环境造成多种毒性。
