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  • Effects of nitrogen fertilization on soil nitrogen pools and microbial properties in a hoop pine (Araucaria cunninghamii) plantation in southeast Queensland, Australia

    Author(s)
    Chen, CR
    Xu, ZH
    Hughes, JM
    Griffith University Author(s)
    Hughes, Jane M.
    Xu, Zhihong
    Chen, Chengrong
    Year published
    2002
    Metadata
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    Abstract
    A field study was conducted to investigate the effects of N fertilization on soil N pools and associated microbial properties in a 13-year-old hoop pine (Araucaria cunninghamii) plantation of southeast Queensland, Australia. The treatments included: (1) control (without N application); (2) 300 kg N ha-1 applied as NH4NO3; and (3) 600 kg N ha-1 as NH4NO3. The experiment employed a randomized complete block design with four replicates. Soil samples were taken approximately 5 years after the N application. The results showed that application of 600 kg N ha-1 significantly increased concentrations of NH4+-N in 0-10 cm soil ...
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    A field study was conducted to investigate the effects of N fertilization on soil N pools and associated microbial properties in a 13-year-old hoop pine (Araucaria cunninghamii) plantation of southeast Queensland, Australia. The treatments included: (1) control (without N application); (2) 300 kg N ha-1 applied as NH4NO3; and (3) 600 kg N ha-1 as NH4NO3. The experiment employed a randomized complete block design with four replicates. Soil samples were taken approximately 5 years after the N application. The results showed that application of 600 kg N ha-1 significantly increased concentrations of NH4+-N in 0-10 cm soil compared with the control and application of 300 kg N ha-1. Concentrations of NO3--N in soil (both 0-10 cm and 10-20 cm) with an application rate of 600 kg N ha-1 were significantly higher compared with the control. Application of 600 kg N ha-1 significantly increased gross N mineralization and immobilization rates (0-10 cm soil) determined by 15N isotope dilution techniques under anaerobic incubation, compared with the control. However, N application did not significantly affect the concentrations of soil total C and total N. N application appeared to decrease microbial biomass C and N and respiration, and to increase the metabolic quotient (qCO2) in 0-10 cm soil, but these effects were not statistically significant. The lack of statistical significance in these microbial properties between the treatments might have been associated with large spatial variability between the replicate plots at this experimental site. Spatial variability in soil microbial biomass C and N was found to relate to soil moisture, total C and total N.
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    Journal Title
    Biology and Fertility of Soils
    Volume
    36
    Publisher URI
    https://link.springer.com/journal/374/volumes-and-issues/36-4
    DOI
    https://doi.org/10.1007/s00374-002-0532-y
    Copyright Statement
    © Springer-Verlag 2002. The original publication is available at www.springerlink.com
    Subject
    Environmental sciences
    Biological sciences
    Agricultural, veterinary and food sciences
    Publication URI
    http://hdl.handle.net/10072/6705
    Collection
    • Journal articles

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