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  • Short-term rather than long-term exclusion of grazing increases soil bacterial diversity in an Inner Mongolian steppe

    Author(s)
    Zhou, Xiaoqi
    Wang, Yanfen
    Hao, Yanbin
    Griffith University Author(s)
    Zhou, Xiaoqi
    Year published
    2012
    Metadata
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    Abstract
    Cessation of grazing is an important management practice in restoration of grassland ecosystem productivity and function. However, little is known about the effects of long-term exclusion of grazing on soil bacterial community structure and diversity in grassland ecosystems. This study utilized three grassland sites over two consecutive years (2004 and 2005) in a semi-arid Inner Mongolia steppe; there were a free grazing site (FG), fenced site since 1999 (UG99) and fenced site since 1979 (UG79). Soil moisture content, organic carbon (C) and nitrogen (N), View the MathML sourceNH4+-N and View the MathML sourceNO3--N concentrations ...
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    Cessation of grazing is an important management practice in restoration of grassland ecosystem productivity and function. However, little is known about the effects of long-term exclusion of grazing on soil bacterial community structure and diversity in grassland ecosystems. This study utilized three grassland sites over two consecutive years (2004 and 2005) in a semi-arid Inner Mongolia steppe; there were a free grazing site (FG), fenced site since 1999 (UG99) and fenced site since 1979 (UG79). Soil moisture content, organic carbon (C) and nitrogen (N), View the MathML sourceNH4+-N and View the MathML sourceNO3--N concentrations were measured across the treatments. Bacterial community structure and diversities were assessed with PCR amplification of genomic DNA extracted from soils and following denaturing gradient gel electrophoresis (DGGE) separation. Results showed that the UG99 soil had higher moisture, organic C, organic N and View the MathML sourceNH4+-N concentrations than the other soils. Principal components analysis of DGGE patterns showed that soil bacterial community structure sampled in 2004 was different from that in 2005, and the UG99 soil was significantly different from the FG and UG79 soils across the two consecutive years. In addition, the UG99 soil had significantly higher bacterial diversity and evenness compared with the FG and UG79 soils. These results indicate that long-term exclusion of grazing decreases bacterial diversity, which has significant implication for grassland ecosystem management.
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    Journal Title
    Acta Ecologica Sinica
    Volume
    32
    Issue
    4
    DOI
    https://doi.org/10.1016/j.chnaes.2012.04.009
    Subject
    Soil Chemistry (excl. Carbon Sequestration Science)
    Ecological Applications
    Ecology
    Publication URI
    http://hdl.handle.net/10072/52622
    Collection
    • Journal articles

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