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| Effects of silver nanoparticles on microbial communities and enzyme activity in four soils |
| Received:September 26, 2017 |
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| KeyWord:silver nanoparticles;microbial diversity;enzyme activity;soil;principal component analysis |
| Author Name | Affiliation | E-mail | | SHU Kun-hui | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHANG Li | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WU Ling-li | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | SI You-bin | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | youbinsi@ahau.edu.cn | | LIU Qin-xue | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | |
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| Abstract: |
| In order to evaluate the microbial toxicity of silver nanoparticles(AgNPs) in soils, incubation experiments were conducted to investigate the effects of AgNPs(0, 10, 50, and 100 mg·kg-1 soil) on microbial biomass, diversity, respiration, and enzyme activity in four different soils. The results showed that a low AgNP content(10 mg·kg-1) had little effect on soil microbes while high contents(50 and 100 mg·kg-1) significantly decreased microbial numbers(bacteria, fungi, and actinomycetes). The richness of the soil bacterial community(Acidobacteria, Actinobacteria, Cyanobacteria, Nitrospirae, and Firmicutes) significantly decreased with increasing AgNPs content, whereas that of several other phyla(e.g. Proteobacteria and Planctomycetes) increased. The soil urease and invertase activities were significantly inhibited, while fluorescein diacetate(FDA) and catalase activities were not pronouncedly changed by the AgNPs content. For the same AgNPs content, the responses of the microbe traits in yellow cinnamon soils and laterite were stronger than those in paddy soil and yellow brown soil. Multivariate principal component analysis suggested that the inhibition of fungi number, FDA enzymes, and catalase activities were positively correlated with soil organic matter and sand contents. The inhibition of urease, invertase activities, and respiration by AgNPs were positively correlated with soil pH and cation exchange capacity. We conclude that AgNPs play a toxic role on soil microbes, and inhibit the growth and reproduction of microorganisms. However, the sensitivity of different microbes to AgNPs is different, and the toxicity of AgNPs can be affected by soil properties. |
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