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  • Effects of Gully and Channel Erosion on Carbon and Nitrogen Storage, Mineralization and Export in a Subtropical Catchment

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    Garzon-Garcia_2014_02Thesis.pdf (9.596Mb)
    Author(s)
    Garzon Garcia, Alexandra
    Primary Supervisor
    Bunn, Stuart
    Other Supervisors
    Olley, Jon
    Year published
    2014
    Metadata
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    Abstract
    The fluxes of sediment, carbon and nutrients in rivers and consequently entering estuaries and the ocean, have been drastically altered by humans. Erosion is known to be one of the major causes of sediment flow disruption by the transfer of large quantities of soil from the terrestrial to the aquatic environment. It is also known to transport in association with sediment, a large amount of carbon and nutrients to the marine environment. Carbon and nutrient fluxes are influenced by other point and non-point sources which have been largely studied, particularly the effects of industrialized agriculture on nutrient fluxes. ...
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    The fluxes of sediment, carbon and nutrients in rivers and consequently entering estuaries and the ocean, have been drastically altered by humans. Erosion is known to be one of the major causes of sediment flow disruption by the transfer of large quantities of soil from the terrestrial to the aquatic environment. It is also known to transport in association with sediment, a large amount of carbon and nutrients to the marine environment. Carbon and nutrient fluxes are influenced by other point and non-point sources which have been largely studied, particularly the effects of industrialized agriculture on nutrient fluxes. However, few studies have looked at the interrelation between the sediment, carbon, and nitrogen cycle disruption in eroding catchments. Gully and channel erosion are widespread across Australia as a result of land clearing and/or the introduction of livestock post-European settlement. This is a particular problem in subtropical Australia, where subsoil erosion is known to be the dominant source of sediment. The implications of gully and channel erosion for sediment budgets have been studied in detail, but its implications for carbon and nitrogen budgets remain an open question. Nitrogen is of particular importance, because it is considered to be the limiting nutrient in streams and rivers of the region and in most estuaries and coastal areas.
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    Thesis Type
    Thesis (PhD Doctorate)
    Degree Program
    Doctor of Philosophy (PhD)
    School
    Griffith School of Environment
    DOI
    https://doi.org/10.25904/1912/2077
    Copyright Statement
    The author owns the copyright in this thesis, unless stated otherwise.
    Item Access Status
    Public
    Subject
    Gully erosion
    Channel erosion
    Marine environments
    Coastal areas
    Mineralization
    Marine pollution
    Nitrogen pollution
    Publication URI
    http://hdl.handle.net/10072/365341
    Collection
    • Theses - Higher Degree by Research

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