城市土壤微环境中 ZnO 纳米颗粒污染下的微生物结构变化。
Microorganism structure variation in urban soil microenvironment upon ZnO nanoparticles contamination.
机构信息
Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China; National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha, Hunan, 410004, China; Laboratory of Urban Forest Ecology of Hunan Province, Changsha, Hunan, 410004, China.
Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China; National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha, Hunan, 410004, China; Laboratory of Urban Forest Ecology of Hunan Province, Changsha, Hunan, 410004, China.
出版信息
Chemosphere. 2021 Jun;273:128565. doi: 10.1016/j.chemosphere.2020.128565. Epub 2020 Oct 10.
Nanoparticles (NPs) sink into the soil via agricultural spreading, surface water, atmospheric deposition, and industrial emission, which affects plant growth and soil microenvironment. To understand how NPs influence urban soil microenvironment, the effect of typical nano-pollutants zinc oxide nanoparticles (ZnONPs) was investigated in urban solid-waste land. Pokeweed (Phytolacca Americana L.) soil samples from solid-waste land were collected and exposed to 200, 500, and 1000 mg kg ZnONPs. The physiological characteristics of pokeweed, soil bacterial community composition, and soil physiochemical properties and enzymatic activities were determined. Our results show that pokeweed growth was slightly inhibited, and soil acid-base homeostasis was affected in ZnONPs-contaminated samples. Meanwhile, enzymatic activities related to soil C cycle were enhanced, and bacterial community structure at the phylum and genus levels was altered. Specifically, the abundance of hydrocarbon-degrading taxa reduced substantially upon ZnONPs exposure. The phenoloxidase (PPO) activity and the refractory hydrocarbon-degrading bacteria Bacteroidetes was adversely affected by ZnONPs exposure. In addition, Subgroup_10 of Acidobacteria was identified as an indicator of soil ZnONPs contamination. Our study detected changes in plant growth, soil environmental factors, and soil microbe community composition in urban solid-waste land treated by ZnONPs. The results of this research provide evidence for ZnONPs toxicology on urban soil microenvironment.
纳米颗粒（NPs）通过农业传播、地表水、大气沉降和工业排放进入土壤，这会影响植物生长和土壤微环境。为了了解 NPs 如何影响城市土壤微环境，研究了典型纳米污染物氧化锌纳米颗粒（ZnONPs）在城市固体废物地上的影响。从固体废物地采集了野菰（Phytolacca Americana L.）土壤样本，并将其暴露于 200、500 和 1000 mg kg ZnONPs 下。测定了野菰的生理特征、土壤细菌群落组成以及土壤理化性质和酶活性。结果表明，ZnONPs 污染的样本中野菰生长受到轻微抑制，土壤酸碱平衡受到影响。同时，与土壤 C 循环相关的酶活性增强，细菌群落结构在门和属水平上发生改变。具体而言，烃降解类群的丰度在 ZnONPs 暴露后大幅减少。酚氧化酶（PPO）活性和难降解烃的细菌拟杆菌门受到 ZnONPs 暴露的不利影响。此外，酸杆菌门的 Subgroup_10 被确定为土壤 ZnONPs 污染的指示物。本研究检测了 ZnONPs 处理的城市固体废物地上植物生长、土壤环境因素和土壤微生物群落组成的变化。该研究结果为 ZnONPs 对城市土壤微环境的毒理学提供了证据。
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