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RESEARCH ARTICLE

Phosphorus speciation and dynamics in river sediments, floodplain soils and leaf litter from the Lower Murray River region

F. T. Watson A C , R. J. Smernik A , A. L. Doolette A and L. M. Mosley B D
+ Author Affiliations
- Author Affiliations

A School of Agriculture, Food and Wine, University of Adelaide, PMB1, Glen Osmond, SA, 5064, Australia.

B School of Biological Sciences, University of Adelaide, PMB1, Glen Osmond, SA, 5064, Australia.

C Present address: The Australian Wine Research Institute, PO Box 197, Glen Osmond, SA 5064, Australia.

D Corresponding author. Email: luke.mosley@adelaide.edu.au

Marine and Freshwater Research 70(11) 1522-1532 https://doi.org/10.1071/MF18360
Submitted: 16 September 2018  Accepted: 14 March 2019   Published: 30 May 2019

Abstract

Phosphorus (P) availability, which depends on both P concentration and speciation, often controls primary productivity and algal-bloom formation in river systems. The river P pool is also connected to P pools of adjacent sediments, soils and vegetation. Thus, informed management of P in floodplain–river systems requires detailed understanding of P concentration and speciation in all of these interconnected components. We studied P speciation in river sediments and water, floodplain soils and river red gum (Eucalyptus camaldulensis) leaf litter from the Lower Murray region using conventional spectroscopic measurements, solution 31P nuclear magnetic resonance (31P NMR) spectroscopy, and leaching experiments to simulate floodplain re-wetting of leaf litter. Almost all (>85%) of the P in river sediments was in the orthophosphate form, whereas floodplain soils had higher proportions of organic P (PO) species. Both fresh and senescent river red gum leaf litter also had a much higher concentration of PO, primarily in the form of phytate. On submersion, there was a rapid (0–96 h) loss of dissolved P from senescent leaves; release of dissolved organic carbon showed similar kinetics. Loss of P from the leaves included both organic and inorganic forms. The results have important implications for aquatic primary productivity and environmental management strategies.

Additional keywords: 31P NMR, speciation.


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