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  • Pathways of different forms of nitrogen and role of ammonia-oxidizing bacteria in alkaline residue sand from bauxite processing

    Author(s)
    Goloran, JB
    Chen, CR
    Phillips, IR
    Liu, X
    Griffith University Author(s)
    Chen, Chengrong
    Goloran, Johnvie B.
    Liu, Xiangyu
    Year published
    2015
    Metadata
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    Abstract
    Nitrogen (N) dynamics and associated processes are often overlooked in the rehabilitation protocols of disturbed landscapes. This study reports on the transformations of N fertilizers and the microbial community, and plant growth responses in rehabilitated strongly alkaline residue sand from bauxite processing (BRS). Ryegrass was grown in specifically designed growth chambers in a two-factorial completely randomized design. Different forms of N fertilizer, such as ammonium sulphate (AS), potassium nitrate (KN) and glycine (GL), were applied at two rates. Nitrogen uptake by plants, residual inorganic N and N losses through ...
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    Nitrogen (N) dynamics and associated processes are often overlooked in the rehabilitation protocols of disturbed landscapes. This study reports on the transformations of N fertilizers and the microbial community, and plant growth responses in rehabilitated strongly alkaline residue sand from bauxite processing (BRS). Ryegrass was grown in specifically designed growth chambers in a two-factorial completely randomized design. Different forms of N fertilizer, such as ammonium sulphate (AS), potassium nitrate (KN) and glycine (GL), were applied at two rates. Nitrogen uptake by plants, residual inorganic N and N losses through leaching and volatilization were determined and quantified throughout the growing period. The abundance of both ammonia-oxidizing archaea (AOA) and bacteria (AOB) was determined by quantitative polymerase chain reaction. The results showed that N uptake was greater with KN fertilizer (31.3–56.4%) than with AS (23.4–47.8%) and GL (16.4–38.1%), in spite of the substantial leaching loss of NO3−. Combined N losses by volatilization and leaching with GL (39–53%) and AS (40–60%) fertilizers indicated both physico-chemical and biological transformations of N by mineralization and nitrification. Ammonia-oxidizing bacteria, rather than AOA, were the dominant nitrifiers that colonized the freshly rehabilitated BRS growth media. The gene copy number of AOB correlated with both soil extractable NO3−-N (r = 0.92, P < 0.001) and ryegrass leaf biomass N (r = 0.89, P < 0.001). We concluded that AOB play a pivotal role in the cycling of N in BRS, whereas NO3−-N is critical for plant N nutrition and rehabilitation in the alkaline BRS disposal areas.
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    Journal Title
    European Journal of Soil Science
    Volume
    66
    Issue
    5
    DOI
    https://doi.org/10.1111/ejss.12274
    Subject
    Soil sciences
    Soil sciences not elsewhere classified
    Plant biology
    Crop and pasture production
    Publication URI
    http://hdl.handle.net/10072/125061
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    • Journal articles

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