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Title: Complex Forms of Soil Organic Phosphorus - A Major Component of Soil Phosphorus
Contributor(s): McLaren, Timothy (author); Smernik, Ronald J (author); McLaughlin, Mike J (author); McBeath, Therese M (author); Kirby, Jason K (author); Simpson, Richard J (author); Guppy, Christopher  (author)orcid ; Doolette, Ashlea L (author); Richardson, Alan E (author)
Publication Date: 2015
DOI: 10.1021/acs.est.5b02948
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Abstract: Phosphorus (P) is an essential element for life, an innate constituent of soil organic matter, and a major anthropogenic input to terrestrial ecosystems. The supply of P to living organisms is strongly dependent on the dynamics of soil organic P. However, fluxes of P through soil organic matter remain unclear because only a minority (typically <30%) of soil organic P has been identified as recognizable biomolecules of low molecular weight (e.g., inositol hexakisphosphates). Here, we use 31P nuclear magnetic resonance spectroscopy to determine the speciation of organic P in soil extracts fractionated into two molecular weight ranges. Speciation of organic P in the high molecular weight fraction (>10 kDa) was markedly different to that of the low molecular weight fraction (<10 kDa). The former was dominated by a broad peak, which is consistent with P bound by phosphomonoester linkages of supra-/macro-molecular structures, whereas the latter contained all of the sharp peaks that were present in unfractionated extracts, along with some broad signal. Overall, phosphomonoesters in supra-/macro-molecular structures were found to account for the majority (61% to 73%) of soil organic P across the five diverse soils. These soil phosphomonoesters will need to be integrated within current models of the inorganic-organic P cycle of soil-plant terrestrial ecosystems.
Publication Type: Journal Article
Source of Publication: Environmental Science & Technology, 49(22), p. 13238-13245
Publisher: American Chemical Society
Place of Publication: Washington, United States of America
ISSN: 1520-5851
Field of Research (FOR): 050304 Soil Chemistry (excl. Carbon Sequestration Science)
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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