Single and combined effects of secondary polyethylene microplastic on the growth of Pak choi and the soil microbiome composition

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Jiamin Hu, Zhenwen Xie, Jiane Zuo
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Abstract

It has been confirmed that microplastics (MPs) are present in the environment. This study simulated secondary PE-MPs via aging and mechanical processes to evaluate their effects on Pak choi (Brassica rapa L.) over 21 d. Two common pollutants, dichlorodiphenyltrichloroethane (DDT) and naphthalene, were used in the combined toxicity tests. The results indicated that the growth of Pak choi was significantly inhibited after exposure to secondary PE-MPs, and the combined effects were antagonistic, owing to the adsorption capacity of secondary PE-MPs to DDT and naphthalene. Oxidative stress in Pak choi can be markedly affected, leading to oxidative damage to plant cells. The moisture content, soil bulk density, soil density, cation exchange capacity (CEC), and FDA hydrolase in the planted soils increased in the treated groups, and the TOC content changed significantly. We also found that the microbial composition of the soil in the DDT and naphthalene groups showed more significant alterations than that in the other groups. Alpha diversity analysis showed that species diversity increased in the combined groups but indicated a clear downward trend in the single MPs groups. This study suggests that secondary PE-MPs harm the growth of Pak choi and can change soil properties, revealing the harm to the ecosystem of MPs in the soil.

Abstract Image

二次聚乙烯微塑料对白菜生长和土壤微生物群组成的单一和综合影响
微塑料(MPs)已被证实存在于环境中。本研究通过老化和机械过程模拟二次聚乙烯-MPs,评估其对白菜(Brassica rapa L.)21 d 的影响。结果表明,接触次生聚乙烯-MPs 后,白菜的生长受到明显抑制,而且由于次生聚乙烯-MPs 对滴滴涕和萘的吸附能力,两者的综合效应是拮抗的。白菜的氧化应激会受到明显影响,导致植物细胞氧化损伤。处理组种植土壤中的含水量、土壤容重、土壤密度、阳离子交换容量(CEC)和 FDA 水解酶均有所增加,总有机碳(TOC)含量也发生了显著变化。我们还发现,滴滴涕和萘组土壤中微生物组成的变化比其他组更为明显。阿尔法多样性分析表明,物种多样性在综合组中有所增加,但在单一 MPs 组中则呈明显下降趋势。这项研究表明,次生聚乙烯-多氯联苯会危害白菜的生长,并能改变土壤性质,揭示了土壤中多氯联苯对生态系统的危害。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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