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| Effects of single-walled carbon nanotubes on degradation of polycyclic aromatic hydrocarbons and microbial community in rhizosphere soil of Medicago sativa |
| Received:March 19, 2021 |
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| KeyWord:single-walled carbon nanotubes;rhizosphere degradation;polycyclic aromatic hydrocarbons(PAHs);microbial community |
| Author Name | Affiliation | E-mail | | WANG Huimin | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CHEN Lirong | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China | | | REN Wenjie | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | wjren@issas.ac.cn | | ZHENG Chunli | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China | | | HUANG Yiwen | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | TENG Ying | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yteng@issas.ac.cn | | ZHANG Tiejun | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China | |
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| Abstract: |
| The study investigated the effect of single-walled carbon nanotubes(SWCNTs) on the degradation of polycyclic aromatic hydrocarbons(PAHs) and microbial communities in alfalfa rhizosphere soil. An indoor -pot experiment was performed to analyze the degradation of PAHs and the response of microbial communities by planting alfalfa(Medicago sativa) and adding different contents of SWCNTs to soil contaminated with high concentrations of PAHs. Addition of 0.5 g·kg-1 and 5 g·kg-1 SWCNTs significantly reduced the removal rate of PAHs in the soil by 3.43% and 6.98%(P<0.05), respectively. The inhibitory effect of SWCNTs on degradation of PAHs mainly involved high-molecular-weight PAHs with five to six rings. SWCNTs were not toxic to alfalfa. When the supplemented level of SWCNTs was 5 g·kg-1, root length, shoot weight, and root weight of alfalfa were significantly increased by 21.44%, 49.13% and 100.00%(P<0.05), respectively, compared with those of the control. The results of qPCR and high-throughput sequencing revealed that the addition of SWCNTs had no significant effect on soil bacterial biomass, richness, and diversity; however, it significantly changed the composition of soil bacterial community. The higher level of SWCNTs(5 g·kg-1) significantly reduced the relative abundance of potential PAH-degrading bacteria in contaminated soil, including Phenylobacterium, Reyranella, Brevundimonas and Pseudorhodoferax. |
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