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| Effects of benzo[a]pyrene pollution over one-time and cumulative patterns on microbial flora in yellow-cinnamon soil |
| Received:August 28, 2017 |
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| KeyWord:B[a]P;accumulated pollution;one-time pollution;microbial flora |
| Author Name | Affiliation | | GE Gao-fei | Biotechnology Center, Anhui Agricultural University, Hefei 230036, China | | ZHANG Ming-shuai | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | YAO Shi | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | ZAN Xuan | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | ZHANG Fang | Biotechnology Center, Anhui Agricultural University, Hefei 230036, China
School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China |
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| Abstract: |
| This study examined the effects of accumulated benzo[a]pyrene(B[a]P) on soil microorganisms. The bioavailability of B[a]P and its influence on microbial populations in yellow-cinnamon soil were investigated using one-time and accumulated pollution methods under simulated conditions. The results showed that the extractable and available B[a]P content in soil declined quickly in the first 28 days, then decreased slowly from 28 to 56 days in each of the two pollution conditions. During the incubation period, the number of soil bacteria significantly increased, while that of fungi and actinomycetes decreased in the accumulated pollution condition. However, decreased populations of bacteria and actinomycetes and an increased number of fungi were observed in the initial stage of the incubation period in the one-time pollution condition. The inhibition rates of accumulated pollution on the activities of different soil microbial species were actinomycetes > fungi > bacteria. For one-time pollution, the inhibition rates were actinomycetes > bacteria > fungi. In conclusion, actinomycetes were the most sensitive of the three microorganisms to B[a]P pollution, and their population size was more correlated with soil B[a]P content than that of either bacteria or fungi. Therefore, actinomycetes could be used as biological indicators for polycyclic aromatic hydrocarbon-contaminated soil. In this study, responses of soil microbial flora to accumulated B[a]P pollution were investigated using a low dose accumulation method, which was an optimum approach that reflected the environmental risk of B[a]P under natural soil conditions. |
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