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  • Gross nitrogen transformations in adjacent native and plantation forests of subtropical Australia

    Author(s)
    Burton, Joanne
    Chen, Chengrong
    Xu, Zhihong
    Ghadiri, Hossein
    Griffith University Author(s)
    Xu, Zhihong
    Chen, Chengrong
    Year published
    2007
    Metadata
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    Abstract
    The impact of land-use change on soil nitrogen (N) transformations was investigated in adjacent native forest (NF), 53 y-old first rotation (1R) and 5 y-old second rotation (2R) hoop pine (Araucaia cunninghamii) plantations. 15N isotope dilution method was used to quantify gross rates of N transformations in aerobic and anaerobic laboratory incubations. Results showed that the land-use change had a significant impact on the soil N transformations. Gross ammonification rates in the aerobic incubation ranged between 0.62 and 1.78 mg N kg-1 d-1 and were significantly lower in NF and 1R soils than in 2R soils. Gross ...
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    The impact of land-use change on soil nitrogen (N) transformations was investigated in adjacent native forest (NF), 53 y-old first rotation (1R) and 5 y-old second rotation (2R) hoop pine (Araucaia cunninghamii) plantations. 15N isotope dilution method was used to quantify gross rates of N transformations in aerobic and anaerobic laboratory incubations. Results showed that the land-use change had a significant impact on the soil N transformations. Gross ammonification rates in the aerobic incubation ranged between 0.62 and 1.78 mg N kg-1 d-1 and were significantly lower in NF and 1R soils than in 2R soils. Gross nitrification rates ranged between 2.1 and 6.6 mg N kg-1 d-1 and were significantly higher in NF soils than in plantation soils. Similarly, rates of gross mineralisation measured in the anaerobic incubation were significantly higher in NF soils compared to plantation soils. Gross nitrification and mineralisation rates were highly correlated with soil C:N ratio (r = -0.66, P<0.01 for both gross nitrification and mineralisation) which in turn was highly correlated with root (r = 0.8315, P<0.01), litter (L) (r = 0.76, P<0.01), and fermentation (F) (r = 0.66, P<0.01) layer C:N ratios. Nitrification was the dominant soil N transformation process in the contrasting forest ecosystems. There is evidence to suggest that heterotrophic nitrifiers may undertake a significant portion of nitrification.
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    Journal Title
    Soil Biology and Biochemistry
    Volume
    39
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/332/description#description
    DOI
    https://doi.org/10.1016/j.soilbio.2006.08.011
    Subject
    Environmental sciences
    Biological sciences
    Agricultural, veterinary and food sciences
    Soil sciences
    Publication URI
    http://hdl.handle.net/10072/17401
    Collection
    • Journal articles

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