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  • Forest residue management affects soil nitrogen availability and humic acid composition

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    Author(s)
    Mathers, NJ
    Xu, ZH
    Boyd, SE
    Griffith University Author(s)
    Boyd, Sue E.
    Xu, Zhihong
    Mathers, Nicole
    Year published
    2004
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    Abstract
    Soil humic substances are important components of soil organic matter and contain a significant portion of total soil organic carbon (C) and nitrogen (N). Solidstate 13C nuclear magnetic resonance (NMR) with cross-polarisation and magic angle spinning (CPMAS) was applied to humic acids extracted from 0-10 cm soils collected from areas under windrows of harvest residues and those areas between the windrows, 3 years after implementation of residue management in a second-rotation plantation of Araucaria cunninghamii Ait. ex D.Don (hoop pine). In addition, nitrogen availability of under-windrow and between-windrow soils was ...
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    Soil humic substances are important components of soil organic matter and contain a significant portion of total soil organic carbon (C) and nitrogen (N). Solidstate 13C nuclear magnetic resonance (NMR) with cross-polarisation and magic angle spinning (CPMAS) was applied to humic acids extracted from 0-10 cm soils collected from areas under windrows of harvest residues and those areas between the windrows, 3 years after implementation of residue management in a second-rotation plantation of Araucaria cunninghamii Ait. ex D.Don (hoop pine). In addition, nitrogen availability of under-windrow and between-windrow soils was also assayed by anaerobic incubation with either water or 15N-labelled ammonium sulphate solution in the laboratory. The NMR spectra of the humic acids showed that the carbon composition of the under-windrow humic acids was different to that of the between-windrow humic acids. Potentially mineralisable nitrogen of the under-windrow soils was greater than that of the between-windrow soils, as was gross nitrogen mineralisation (ammonification, mg). Soil potentially mineralisable nitrogen was also positively correlated with humic acid-alkyl and humic acid-O-alkyl carbon (p<0.05), while gross nitrogen mineralisation was positively correlated with humcacid-aromatic carbon (p<0.01). The gross nitrogen mineralisation was 33-45 mg N/kg dry soil as determined by isotope dilution with 15N-labelled ammonium sulphate (100 mg N/kg and 99 atom% 15N excess) and was greater in under-windrow than between-windrow soil after the 7-day anaerobic incubation. In addition, gross 15N immobilised (NH4+ consumption, mi) was positively correlated with humic acidaromatic carbon (p<0.05). Humic acid-iron content was positively correlated with humic acid-alkyl and O-alkyl carbon (p<0.05).
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    Journal Title
    New Zealand Journal of Forestry Science
    Volume
    34
    Issue
    1
    Publisher URI
    http://nzjfs.scionresearch.com/Corp/KC/NZJFSSubs.nsf?OpenDatabase
    Copyright Statement
    © The Author(s) 2004. This is the author-manuscript version of this paper. It is posted here with permission of the copyright owners for your personal use only. No further distribution permitted. For information about this journal please refer to the publisher's website or contact the authors. Reproduction and fair use of any of the material contained on the publisher's website for your own use is welcomed provided that all copyright notices are kept intact and you acknowledge the source of the material. You may download content from this site for your personal or internal use only. You may not make any commercial use of or in any way commercially exploit this site or its contents. You may not make any modifications to this site or any portion of it or use any data mining, robots or similar data gathering and extraction tools in respect of this site.
    Subject
    History and Archaeology
    Ecological Applications
    Forestry Sciences
    Publication URI
    http://hdl.handle.net/10072/5242
    Collection
    • Journal articles

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