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Soluble Organic Nitrogen Pools in Forest soils of Subtropical Australia

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Abstract

Soil soluble organic N (SON) plays an important role in N biogeochemical cycling. In this study, 22 surface forest soils (0–10 cm) were collected from southeast Queensland, Australia, to investigate the size of SON pools extracted by water and salt solutions. Approximately 5–45 mg SON kg−1, 2–42 mg SON kg−1 and 1–24 SON mg kg−1 were extracted by 2 M KCl, 0.5 M K2SO4 and water, on average, corresponding to about 21.1, 13.5 and 7.0 kg SON ha−1 at the 0–10 cm forest soils, respectively. These SON pools, on average, accounted for 39% (KCl extracts), 42% (K2SO4 extracts) and 43% (water extracts) of total soluble N (TSN), and 2.3% (KCl extracts), 1.3% (K2SO4 extracts) and 0.7% (water extracts) of soil total N, respectively. Large variation in SON pools observed across the sites in the present study may be attributed to a combination of factors including soil types, tree species, management practices and environmental conditions. Significant relationships were observed among the SON pools extracted by water, KCl and K2SO4 and microbial biomass N (MBN). In general, KCl and K2SO4 extracted more SON than water from the forest soils, while KCl extracted more SON than K2SO4. The SON and soluble organic C (SOC) in KCl, K2SO4 and water extracts were all positively related to soil organic C, total N and clay contents. This indicates that clay and soil organic matter play a key role in the retention of SON in soil.

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Authors and Affiliations

  1. Centre for Forestry and Horticultural Research and Faculty of Environmental Sciences, Griffith University, 4111, Nathan, Queensland, Australia

    C. R. Chen, Z. H. Xu & S. L. Zhang

  2. College of Resources and Environment, Northwest Sci-Tech University of Agriculture and Forestry, 712100, Yangling, Shaanxi, P. R. China

    S. L. Zhang

  3. DPI Forestry, Fraser Road, 4570, Queensland, Gympie, Australia

    P. Keay

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  1. C. R. Chen
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Correspondence to C. R. Chen.

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Chen, C.R., Xu, Z.H., Zhang, S.L. et al. Soluble Organic Nitrogen Pools in Forest soils of Subtropical Australia. Plant Soil 277, 285–297 (2005). https://doi.org/10.1007/s11104-005-7530-4

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