Complex Forms of Soil Organic Phosphorus - A Major Component of Soil Phosphorus

Title
Complex Forms of Soil Organic Phosphorus - A Major Component of Soil Phosphorus
Publication Date
2015
Author(s)
McLaren, Timothy
Smernik, Ronald J
McLaughlin, Mike J
McBeath, Therese M
Kirby, Jason K
Simpson, Richard J
Guppy, Christopher
( author )
OrcID: https://orcid.org/0000-0001-7274-607X
Email: cguppy@une.edu.au
UNE Id une-id:cguppy
Doolette, Ashlea L
Richardson, Alan E
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
American Chemical Society
Place of publication
United States of America
DOI
10.1021/acs.est.5b02948
UNE publication id
une:19872
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.
Link
Citation
Environmental Science & Technology, 49(22), p. 13238-13245
ISSN
1520-5851
0013-936X
Start page
13238
End page
13245

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