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  • The effects of short term, long term and reapplication of biochar on soil bacteria

    Author(s)
    Thi, Thu Nhan Nguyen
    Wallace, Helen M
    Xu, Cheng-Yuan
    Zwieten, Lukas Van
    Weng, Zhe Han
    Xu, Zhihong
    Che, Rongxiao
    Tahmasbian, Iman
    Hu, Hang-Wei
    Bai, Shahla Hosseini
    Griffith University Author(s)
    Xu, Zhihong
    Hosseini-Bai, Shahla
    Wallace, Helen M.
    Year published
    2018
    Metadata
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    Abstract
    Biochar has been shown to affect soil microbial diversity and abundance. Soil microbes play a key role in soil nutrient cycling, but there is still a dearth of knowledge on the responses of soil microbes to biochar amendments, particularly for longer-term or repeated applications. We sampled soil from a field trial to determine the individual and combined effects of newly applied (1 year ago), re-applied (1 year ago into aged biochar) and aged (9 years ago) biochar amendments on soil bacterial communities, with the aim of identifying the potential underlying mechanisms or consequences of these effects. Soil bacterial diversity ...
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    Biochar has been shown to affect soil microbial diversity and abundance. Soil microbes play a key role in soil nutrient cycling, but there is still a dearth of knowledge on the responses of soil microbes to biochar amendments, particularly for longer-term or repeated applications. We sampled soil from a field trial to determine the individual and combined effects of newly applied (1 year ago), re-applied (1 year ago into aged biochar) and aged (9 years ago) biochar amendments on soil bacterial communities, with the aim of identifying the potential underlying mechanisms or consequences of these effects. Soil bacterial diversity and community composition were analysed by sequencing of 16S rRNA using a Miseq platform. This investigation showed that biochar in soil after 1 year significantly increased bacterial diversity and the relative abundance of nitrifiers and bacteria consuming pyrogenic carbon (C). We also found that the reapplication of biochar had no significant effects on soil bacterial communities. Mantel correlation between bacterial diversity and soil chemical properties for four treatments showed that the changes in soil microbial community composition were well explained by soil pH, electrical conductivity (EC), extractable organic C and total extractable nitrogen (N). These results suggested that the effects of biochar amendment on soil bacterial communities were highly time-dependent. Our study highlighted the acclimation of soil bacteria on receiving repeated biochar amendment, leading to similar bacterial diversity and community structure among 9-years old applied biochar, repeated biochar treatments and control.
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    Journal Title
    Science of the Total Environment
    Volume
    636
    DOI
    https://doi.org/10.1016/j.scitotenv.2018.04.278
    Subject
    Soil sciences not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/381498
    Collection
    • Journal articles

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