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  • Soil Carbon and Nitrogen Dynamics in the Riparian Zones of Wyaralong Dam in Southeast Queensland, Australia

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    Jiang_2017_01Thesis.pdf (4.834Mb)
    Author(s)
    Jiang, Qi
    Primary Supervisor
    Xu, Zhihong
    Chen, Chengrong
    Wang, Weijin
    Other Supervisors
    Boyd, Sue
    Bai, Shahla Hosseini
    Year published
    2017
    Metadata
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    Abstract
    Riparian zones are considered to be dynamic boundaries between terrestrial and aquatic systems, and are of primary importance in maintaining the vitality of landscapes and of surface water bodies. As an important part of the ecosystem, riparian zones are important for ecosystem functions and services, including biodiversity, water quality and recreation. However, riparian areas are often profoundly modified and degraded, with significant losses of ecological significance and functioning. The construction of dam is well known to change the local ecological patterns, especially by reducing the magnitude and frequency and changing ...
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    Riparian zones are considered to be dynamic boundaries between terrestrial and aquatic systems, and are of primary importance in maintaining the vitality of landscapes and of surface water bodies. As an important part of the ecosystem, riparian zones are important for ecosystem functions and services, including biodiversity, water quality and recreation. However, riparian areas are often profoundly modified and degraded, with significant losses of ecological significance and functioning. The construction of dam is well known to change the local ecological patterns, especially by reducing the magnitude and frequency and changing duration of flood events. Soil moisture plays a key role in determining the vitality and activity of soil microorganisms by controlling water and oxygen availability in the soils, therefore affecting microbial mediated carbon (C) and nitrogen (N) transformations in the riparian areas. Net accumulation of soil organic matter (SOM) in submerged soils often occur compared with those in the aerobic soils, due to the decrease in SOM decomposition. Nitrogen turnover in riparian soils is especially sensitive to soil moisture regimes. Autotrophic nitrification mainly occurs under aerobic conditions; while ammonification and immobilization of ammonium (NH4 ) could happen under both aerobic and anaerobic conditions. Soil N could be lost as nitrous oxide (N2O) through nitrification under aerobic conditions, and through denitrification under anaerobic conditions. Rewetting dry soil always leads to a pulse of respiration and perhaps N mineralisation.
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    Thesis Type
    Thesis (PhD Doctorate)
    Degree Program
    Doctor of Philosophy (PhD)
    School
    School of Natural Sciences
    DOI
    https://doi.org/10.25904/1912/1394
    Copyright Statement
    The author owns the copyright in this thesis, unless stated otherwise.
    Subject
    Riparian zones
    Microbial mediated carbon
    Nitrogen (N) transformations
    Soil carbon
    Soil nitogen
    Soil chemistry
    Wyaralong Dam, South-East Queensland
    Publication URI
    http://hdl.handle.net/10072/368186
    Collection
    • Theses - Higher Degree by Research

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