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|Title:||Complex forms of soil organic phosphorus-a major component of soil phosphorus|
|Citation:||Environmental Science and Technology, 2015; 49(22):13238-13245|
|Publisher:||American Chemical Society|
|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; Soil; Magnetic Resonance Spectroscopy; Ecosystem; Molecular Weight|
|Rights:||© 2015 American Chemical Society|
|Appears in Collections:||Chemical Engineering publications|
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