Effect of long-term fertilization on humic redox mediators in multiple microbial redox reactions

文献类型： 外文期刊

第一作者： Guo, Peng

作者： Guo, Peng;Zhang, Chunfang;Zhang, Dongdong;Guo, Peng;Wang, Yi;Zhang, Dongdong;Yu, Xinwei;Zhang, Zhichao

作者机构：

关键词： Organic fertilization;Redox activity;Humic substance;Microbial respiration;Polychlorinated biphenyl

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2018 年 234 卷

页码：

收录情况： SCI

摘要： This study investigated the effects of different long-term fertilizations on humic substances (HSs), humic acids (HAs) and humins, functioning as redox mediators for various microbial redox biotransformations, including 2,2',4,4',5,5'- hexachlorobiphenyl (PCB153) dechlorination, dissimilatory iron reduction, and nitrate reduction, and their electron-mediating natures. The redox activity of HSs for various microbial redox metabolisms was substantially enhanced by long-term application of organic fertilizer (pig manure). As a redox mediator, only humin extracted from soils with organic fertilizer amendment (OF-HM) maintained microbial PCB153 dechlorination activity (1.03 mu M PCB153 removal), and corresponding HA (OF-HA) most effectively enhanced iron reduction and nitrate reduction by Shewanella putrefaciens. Electrochemical analysis confirmed the enhancement of their electron transfer capacity and redox properties. Fourier transform infrared analysis showed that C=C and C=O bonds, and carboxylic or phenolic groups in HSs might be the redox functional groups affected by fertilization. This research enhances our understanding of the influence of anthropogenic fertility on the biogeochemical cycling of elements and in situ remediation ability in agroecosystems through microorganisms' metabolisms. (C) 2017 Elsevier Ltd. All rights reserved.

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