Effect of rhizodeposition on alterations of soil structure and microbial community in pyrene–lead co-contaminated soils

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• 作者：Hongbing Li ; Xinying Zhang ; Xiaoyan Liu ; Xing Hu ; Qian Wang…
• 关键词：Rhizodeposition effect ; Sequential extraction ; Phospholipid fatty acid analysis ; Pyrene–lead co ; contaminated soil ; Microbial community
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：75
• 期：2
• 全文大小：907 KB
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• 作者单位：Hongbing Li (1)
  Xinying Zhang (1)
  Xiaoyan Liu (1)
  Xing Hu (1)
  Qian Wang (1)
  Yunyun Hou (1)
  Xueping Chen (1)
  Xiao Chen (1)
  
  1. Laboratory of Environmental Remediation, College of Environment and Chemical Engineering, Shanghai University, No.99, Shangda Road, Baoshan District, Shanghai, 200444, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Rhizodeposition is considered as a main strategy for plants to regulate its rhizospheric microorganisms. However, effect of rhizodeposition on degradation of polycyclic aromatic hydrocarbons (PAHs), and the alterations of soil structure and microbial community are still unclear, especially in metal–PAHs co-contaminated soils. The study focused on illustrating the microcosm changed by rhizodeposition to find out the dominating factors for the dissipation of pyrene. The analysis results with Fourier transform infrared spectroscopy (FT-IR) showed that the relative abundance of some functional groups in humic acids was amplified by rhizodeposition effect. A result was observed that soluble fraction of lead was rapidly transformed into other fractions by the rhizodeposits. It was found that the rhizodeposition effect exhibited considerable improvement in the degradation of pyrene especially in the lead–pyrene co-contaminated soils. Phospholipid fatty acid analysis (PLFA) showed substantial differences in microbial communities between incubation time and rhizodeposition effect. The studied results further revealed the removal mechanism of pyrene in pyrene–lead co-contaminated soils. Keywords Rhizodeposition effect Sequential extraction Phospholipid fatty acid analysis Pyrene–lead co-contaminated soil Microbial community