4.7 Article

Influence of root-exudates concentration on pyrene degradation and soil microbial characteristics in pyrene contaminated soil

期刊

CHEMOSPHERE
卷 88, 期 10, 页码 1190-1195

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.03.068

关键词

Pyrene; Degradation; Root-exudates concentration; Ecological mechanism

资金

  1. Zhejiang Natural Science Foundation of China [Y5090001]
  2. Foundation of Zhejiang Educational Committee of China [Y200906259]
  3. Zhejiang Province University Students' Science and Technology Innovation Program [2011R 401118]

向作者/读者索取更多资源

The effect of ryegrass (Lolium perenne L) root-exudates concentration on pyrene degradation and the microbial ecological characteristics in the pyrene contaminated soil was investigated by simulating a gradually reducing concentration of root exudates with the distance away from root surface in the rhizosphere. Results showed that, after the root-exudates were added 15 d, the pyrene residue in contaminated soil responded nonlinearly in the soils with the same pyrene contaminated level as the added root-exudates concentration increased, which decreased first and increased latter with the increase of the added root-exudates concentration. The lowest pyrene concentration appeared when the root exudates concentration of 32.75 mg kg(-1) total organic carbon (TOC) was added. At the same time, changes of microbial biomass carbon (MBC, C-mic) and microbial quotient (C-mic/C-org) were opposite to the trend of pyrene degradation as the added root-exudates concentration increased. Phospholipid fatty acid (PLFA) analysis revealed that bacteria was the dominating microbial community in pyrene contaminated soil, and the changing trends of pyrene degradation and bacteria number were the same. The changing trend of endoenzyme-dehydrogenase activity was in accordance with that of soil microbe, indicating which could reflect the quantitative characteristic of detoxification to pyrene by soil microbe. The changes in the soils microbial community and corresponding microbial biochemistry characteristics were the ecological mechanism influencing pyrene degradation with increasing concentration of the added root-exudates in the pyrene contaminated soil. (C) 2012 Elsevier Ltd. All rights reserved.

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