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  Characterization of soil organic matter in aggregates and size-density fractions by solid state C-13 CPMAS NMR spectroscopy.

Rabbi, S. M. F., Linser, R., Hook, J. M., Wilson, B. R., Lockwood, P. V., Daniel, H., et al. (2014). Characterization of soil organic matter in aggregates and size-density fractions by solid state C-13 CPMAS NMR spectroscopy. Communications in Soil Science and Plant Analysis, 45(11), 1523-1537. doi:10.1080/00103624.2014.904335.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-9DE7-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-7AA1-B
Genre: Journal Article

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1977428.pdf (Publisher version), 538KB
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 Creators:
Rabbi, S. M. F., Author
Linser, R.1, Author              
Hook, J. M., Author
Wilson, B. R., Author
Lockwood, P. V., Author
Daniel, H., Author
Young, I. M., Author
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1Research Group of Solid-State NMR-2, MPI for Biophysical Chemistry, Max Planck Society, ou_1950286              

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Free keywords: Soil aggregate; O\-alkyl carbon; Alkyl carbon; Aromatic carbon; Selective preservation
 Abstract: Understanding the changes in soil organic matter (SOM) composition during aggregate formation is crucial to explain the stabilization of SOM in aggregates. The objectives of this study were to investigate (i) the composition of SOM associated with different aggregates and size-density fractions and (ii) the role of selective preservation in determining the composition of organic matter in aggregate and size-density fractions. Surface soil samples were collected from an Alfisol on the Northern Tablelands of NSW, Australia with contrasting land uses native pasture, crop-pasture rotation and woodland. Solid state 13C cross-polarization and magic angle spinning (CPMAS) Nuclear Magnetic Resonance (NMR) spectroscopy was used to determine the SOM composition in macroaggregates (250-2000 µm), microaggregates (53-250 µm), and <53 µm fraction. The chemical composition of light fraction (LF), coarse particulate organic matter (cPOM), fine particulate organic matter (fPOM) and mineral associated soil organic matter (mSOM) were also determined. The major constituent of SOM of aggregate size fractions was O-alkyl carbon, which represented 44-57% of the total signal acquired, whereas alkyl carbon contributed 16-27%. There was a progressive increase in alkyl carbon content with decrease in aggregate size. Results suggest that SOM associated with <53 µm fraction was at a more advanced stage of decomposition than that of macroaggregates and microaggregates. The LF and cPOM were dominated by O-alkyl carbon while alkyl carbon content was high in fPOM and mSOM. Interestingly, the relative change in O-alkyl, alkyl and aromatic carbon between aggregates and SOM fractions revealed that microbial synthesis and decomposition of organic matter along with selective preservation of alkyl and aromatic carbon plays a significant role in determining the composition of organic matter in aggregates.

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Language(s): eng - English
 Dates: 2014-04-22
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1080/00103624.2014.904335
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Title: Communications in Soil Science and Plant Analysis
Source Genre: Journal
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Pages: - Volume / Issue: 45 (11) Sequence Number: - Start / End Page: 1523 - 1537 Identifier: -