The organic P composition of vertisols as determined by 31P NMR spectroscopy

McLaren, Timothy I., Smernik, Ronald J., Guppy, Christopher N., Bell, Mike J. and Tighe, Matthew K. (2014) The organic P composition of vertisols as determined by 31P NMR spectroscopy. Soil Science Society of America Journal, 78 6: 1893-1902. doi:10.2136/sssaj2014.04.0139


Author McLaren, Timothy I.
Smernik, Ronald J.
Guppy, Christopher N.
Bell, Mike J.
Tighe, Matthew K.
Title The organic P composition of vertisols as determined by 31P NMR spectroscopy
Formatted title
The organic P composition of vertisols as determined by 31P NMR spectroscopy
Journal name Soil Science Society of America Journal   Check publisher's open access policy
ISSN 1435-0661
0361-5995
Publication date 2014-11-01
Year available 2014
Sub-type Article (original research)
DOI 10.2136/sssaj2014.04.0139
Volume 78
Issue 6
Start page 1893
End page 1902
Total pages 10
Place of publication Madison, WI, United States
Publisher Soil Science Society of America
Collection year 2015
Language eng
Formatted abstract
Solution 31P nuclear magnetic resonance (NMR) spectroscopy on sodium hydroxide–ethylenediaminetetraacetic acid (NaOH–EDTA) extracts can provide detailed characterization of soil organic P, but has not been previously applied widely to Vertisols. Vertisol soils were collected at two depths (0–10 cm and 10–30 cm) for chemical and spectroscopic analysis. Sodium hydroxide–EDTA extracted a relatively consistent proportion (17 to 37%; average 25%) of the total organic P content determined by the ignition–H2SO4 extraction technique. Orthophosphate monoesters were the dominant form of organic P detected by solution 31P NMR spectroscopy of the NaOH–EDTA extracts, the majority of which appeared to be present in large ‘humic’ molecules, based on the predominance of a broad peak in the NMR spectra; some smaller signals due to glycerophosphate, inositol phosphates, and RNA-derived mononucleotides were also evident. The composition of organic P in the topsoil layer was very similar to that in the subsoil layer. Strong correlations were found between soil organic carbon (C) and nitrogen (N) and extractable organic P, which suggests that processes regulating the cycling of organic C and N are closely related to that for organic P in these Vertisols.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2015 Collection
 
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