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Type: Journal article
Title: Complex forms of soil organic phosphorus-a major component of soil phosphorus
Author: McLaren, T.
Smernik, R.
McLaughlin, M.
McBeath, T.
Kirby, J.
Simpson, R.
Guppy, C.
Doolette, A.
Richardson, A.
Citation: Environmental Science and Technology (Washington), 2015; 49(22):13238-13245
Publisher: American Chemical Society
Issue Date: 2015
ISSN: 0013-936X
Statement of
Timothy I. McLaren, Ronald J. Smernik, Mike J. McLaughlin, Therese M. McBeath, Jason K. Kirby, Richard J. Simpson, Christopher N. Guppy, Ashlea L. Doolette and Alan E. Richardson
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.
Keywords: Phosphorus
Phosphorus Isotopes
Magnetic Resonance Spectroscopy
Molecular Weight
Rights: © 2015 American Chemical Society
DOI: 10.1021/acs.est.5b02948
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