• DOI:10.1071/SR15085
• Corpus ID: 131499063

Organic phosphorus speciation in Australian Red Chromosols: stoichiometric control

@article{Moata2016OrganicPS,
  title={Organic phosphorus speciation in Australian Red Chromosols: stoichiometric control},
  author={Melinda R. S. Moata and Ashlea L. Doolette and Ronald J. Smernik and Ann Marie McNeill and Lynne M. Macdonald},
  journal={Soil Research},
  year={2016},
  volume={54},
  pages={11-19}
}

• M. Moata, A. Doolette, +2 authors L. Macdonald
• Published 26 February 2016
• Chemistry
• Soil Research

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.