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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) ; Doolette, Ashlea L (author); Richardson, Alan E (author)||Publication Date:||2015||DOI:||10.1021/acs.est.5b02948||Handle Link:||https://hdl.handle.net/1959.11/19682||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||Statistics to Oct 2018:||Visitors: 92
|Appears in Collections:||Journal Article|
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