Microbial activity and metamitron degrading microbial communities differ between soil and water-sediment systems

S. Wang, A. Miltner, A. M. Muskus, K. M. Nowak

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    2 Scopus citations

    Abstract

    The herbicide metamitron is frequently detected in the environment, and its degradation in soil differs from that in aquatic sediments. In this study, we applied 13C6-metamitron to investigate the differences in microbial activity, metamitron mineralization and metamitron degrading microbial communities between soil and water-sediment systems. Metamitron increased soil respiration, whereas it suppressed respiration in the water-sediment system as compared to controls. Metamitron was mineralized two-fold faster in soil than in the water-sediment. Incorporation of 13C from 13C6-metamitron into Phospholipid fatty acids (PLFAs) was higher in soil than in sediment, suggesting higher activity of metamitron-degrading microorganisms in soil. During the accelerated mineralization of metamitron, biomarkers for Gram-negative, Gram-positive bacteria and actinobacteria dominated within the 13C-PLFAs in soil. Gram-negative bacteria dominated among the metamitron degraders in sediment throughout the incubation period. Actinobacteria, and actinobacteria and fungi were the main consumers of necromass of primary degraders in soil and water-sediment, respectively. This study clearly showed that microbial groups involved in metamitron degradation depend on the system (soil vs. water-sediment) and on time. It also indicated that the turnover of organic chemicals in complex environments is driven by different groups of synthropic degraders (primary degraders and necromass degraders) rather than by a single degrader.

    Original languageEnglish
    Article number124293
    JournalJournal of Hazardous Materials
    Volume408
    DOIs
    StatePublished - 15 Apr 2021

    Bibliographical note

    Funding Information:
    The authors thank the Helmholtz Centre for Environmental Research – UFZ and the German Research Council ( DFG. No 980/1-3 ) for supporting the research. The Chinese Scholarship Council is acknowledged for funding the fellowship of S. Wang. We also thank Ursula Günther, Steffen Kümmel and Matthias Gehre (UFZ, Dept. Isotope Biogeochemistry) for their valuable assistance in compound-specific isotope analysis.

    Funding Information:
    The authors thank the Helmholtz Centre for Environmental Research – UFZ and the German Research Council (DFG. No 980/1-3) for supporting the research. The Chinese Scholarship Council is acknowledged for funding the fellowship of S. Wang. We also thank Ursula Günther, Steffen Kümmel and Matthias Gehre (UFZ, Dept. Isotope Biogeochemistry) for their valuable assistance in compound-specific isotope analysis.

    Publisher Copyright:
    © 2020 Elsevier B.V.

    Keywords

    • Microbial community structure
    • Microbial respiration
    • Mineralization
    • Phospholipid fatty acids
    • Stable isotope label

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