Organic phosphorus speciation in Australian Red Chromosols: stoichiometric control
Melinda R. S. Moata A C , Ashlea L. Doolette A D , Ronald J. Smernik A , Ann M. McNeill A and Lynne M. Macdonald A B
+ Author Affiliations
- Author Affiliations
A Soils Group, School of Agriculture, Food and Wine and Waite Research Institute, The University of Adelaide, Waite Campus, Urrbrae, SA 5064, Australia.
B CSIRO Agriculture, PMB2, Glen Osmond, SA 5064, Australia.
C Department of Dryland Management, Kupang State Polytechnic for Agriculture, PO Box 1152, Kupang 85011, East Nusa Tenggara, Indonesia.
D Corresponding author. Email: ashlea.doolette@adelaide.edu.au
Soil Research 54(1) 11-19 https://doi.org/10.1071/SR15085
Submitted: 17 March 2015 Accepted: 21 May 2015 Published: 20 January 2016
Abstract
Organic phosphorus (P) plays an important role in the soil P cycle. It is present in various chemical forms, the relative amounts of which vary among soils, due to factors including climate, land use, and soil type. Few studies have investigated co-variation between P types or stoichiometric correlation with the key elemental components of organic matter– carbon (C) and nitrogen (N), both of which may influence P pool structure and dynamics in agricultural soils. In this study we determined the organic P speciation of twenty Australian Red Chromosols soils, a soil type widely used for cropping in Australia. Eight different chemical forms of P were quantified by 31P NMR spectroscopy, with a large majority (>90%) in all soils identified as orthophosphate and humic P. The strongest correlations (r2 = 0.77–0.85, P < 0.001) between P types were found among minor components: (i) between two inositol hexakisphosphate isomers (myo and scyllo) and (ii) between phospholipids and RNA (both detected as their alkaline hydrolysis products). Total soil C and N were correlated with phospholipid and RNA P, but not the most abundant P forms of orthophosphate and humic P. This suggests an influence of organic matter content on the organic P pool consisting of phospholipid and RNA, but not on inositol P or the largest organic P pool in these soils – humic P.
Additional keywords: carbon, diester phosphate, monoester phosphate, nitrogen, organic P, solution 31P NMR spectroscopy, stoichiometry.
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