Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 707, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.135634
Keywords
Microplastics; Soil ecosystem; Nitrogen cycling; Microbial community; Acid phosphatase
Categories
Funding
- Zhejiang Provincial Natural Science Foundation of China [LZ19D010001]
- National Natural Science Foundation of China [41771351]
- Zhejiang Agriculture and Forestry University Research Fund [2017FR021]
- Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-DQC015]
- 111 Project [D18008]
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The ecological stress of microplastics (MPs) contamination in agroecosystems raise worldwide concerns. However very few studies concentrated on the effects of MPs exposure on soil microbial community. The alterations of enzymatic activities and bacterial communities were assayed by spiking 1% and 5% (w/w) of polyethylene (PE) and polyvinyl chloride (PVC) MPs in an acid soil. The results showed that both PE and PVC addition inhibited fluorescein diacetate hydrolase activity and stimulated urease and acid phosphatase activities, and declined the richness and diversity of the bacterial communities. More severe effects were observed in the PE treated soils compared to the PVC treated soils generally. The relative abundances of families Burkholderiaceae increased significantly (p < .05) after MPs addition, suggesting the bacteria associated with nitrogen fixation stimulated by the MPs input. Meanwhile, significant (p < .05) decline of Sphingomonadaceae and Xanthobacteraceae after addition of 5% PVC and 1% PE MPs, respectively implied that MPs might inhibit the biodegradation of xenobiotics in the soil. Mover, the PICRUSt analysis demonstrated that membrane transporter was a sensitive prediction functional gene of microplastics exposure in the soil. Future studies could be focused on the role of MPs on the regulation of nitrogen cycling and organic compounds degradation in soils. (C) 2019 Elsevier B.V. All rights reserved.
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