Abstract
The dynamics of phosphate in the Middle Paraná wetlands was studied by means of isotopic technique. Laboratory reactors containing water–Paspalum repens–sediment and water–sediment were prepared in quadruplicate. Initially, 15 mg of P (as KH2PO4) and 15 μCi (microcurie) of 32P were added to water and sediment systems (5 l). Water samples were taken periodically and inorganic phosphate and radioactivity were determined. The total phosphorus concentration and 32P were determined on the initial and final sediment and plant samples. It was corroborated that there is a dynamic and continuous P-exchange among the various compartments of the aquatic system, which proves both the release of P from the sediment as well as the adsorption of P onto the sediment. The adsorption of P basically takes place at the surface layer of the sediment (1 cm). Paspalum repens is efficient in the P uptake, not only from the sediment through the roots, but also probably from water, through leaves and stems.
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Panigatti, M.C., Maine, M.A. Phosphate dynamics in the Middle Paraná wetlands using 32P isotopic technique. Hydrobiologia 472, 45–51 (2002). https://doi.org/10.1023/A:1016348512459
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DOI: https://doi.org/10.1023/A:1016348512459