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https://hdl.handle.net/1959.11/19682
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: | United States of America | ISSN: | 1520-5851 0013-936X |
Fields of Research (FoR) 2008: | 050304 Soil Chemistry (excl. Carbon Sequestration Science) | Fields of Research (FoR) 2020: | 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) | Socio-Economic Objective (SEO) 2008: | 961402 Farmland, Arable Cropland and Permanent Cropland Soils | Socio-Economic Objective (SEO) 2020: | 180605 Soils | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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