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  • Long-Term Harvest Residue Retention Could Decrease Soil Bacterial Diversities Probably Due to Favouring Oligotrophic Lineages

    Author(s)
    Zhang, Yaling
    Zhang, Manyun
    Tang, Li
    Che, Rongxiao
    Chen, Hong
    Blumfield, Tim
    Boyd, Sue
    Nouansyvong, Mone
    Xu, Zhihong
    Griffith University Author(s)
    Xu, Zhihong
    Year published
    2018
    Metadata
    Show full item record
    Abstract
    Harvest residues contain large stores of carbon (C) and nitrogen (N) in forest plantations. Decomposing residues can release labile C and N into soil and thus provide substrates for soil bacterial communities. Previous studies showed that residue retention could increase soil C and N pools and activate bacterial communities in the short term (≤ 10 years). The current study examined the effects of a long-term (19-year) harvest residue retention on soil total and water and hot water extractable C and N pools, as well as bacterial communities via Illumina MiSeq sequencing. The experiment was established in a randomised complete ...
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    Harvest residues contain large stores of carbon (C) and nitrogen (N) in forest plantations. Decomposing residues can release labile C and N into soil and thus provide substrates for soil bacterial communities. Previous studies showed that residue retention could increase soil C and N pools and activate bacterial communities in the short term (≤ 10 years). The current study examined the effects of a long-term (19-year) harvest residue retention on soil total and water and hot water extractable C and N pools, as well as bacterial communities via Illumina MiSeq sequencing. The experiment was established in a randomised complete block design with four replications, southeast Queensland of Australia, including no (R0), single (R1, 51 to 74 t ha−1 dry matter) and double quantities (R2, 140 t ha−1 dry matter) of residues retained. Generally, no significant differences existed in total C and N, as well as C and N pools extracted by water and hot water among the three treatments, probably due to negligible amounts of labile C and N released from harvest residues. Soil δ15N significantly decreased from R0 to R1 to R2, probably due to reduced N leaching with residue retention (P < 0.001). Residue retention increased the relative abundances of Actinobacteria (P = 0.016) and Spartobacteria (P < 0.001), whereas decreased Betaproteobacteria (P = 0.050). This favour for the oligotrophic groups probably caused the decrease in the bacterial diversity as revealed by Shannon index (P = 0.025). Hence, our study suggests that residue retention is not an appropriate management practice in the long term.
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    Journal Title
    Microbial Ecology
    Volume
    76
    Issue
    3
    DOI
    https://doi.org/10.1007/s00248-018-1162-8
    Subject
    Soil sciences
    Ecology
    Ecology not elsewhere classified
    Microbiology
    Forest plantation
    Residue retention
    Soil δ15N
    Nuclear magnetic resonance
    Bacterial composition
    Bacterial diversity
    Publication URI
    http://hdl.handle.net/10072/381833
    Collection
    • Journal articles

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