Abstract
Water – Salvinia herzogii – sediment systems were exposed to different phosphorus and nitrogen combinations in outdoor experiments. The aim was to estimate the amounts of P immobilized in macrophytes and sediments, as well as to elucidate whether or not the presence of N affects the retention of P. The following components were added: o-P, o-P + NH4 +, o-P + NO3 − + NH4 +, o-P + NO3 −. The concentration of nutrients was periodically determined throughout the experiment (28 days). The concentrations of P and N in plant tissues and sediments were determined at the beginning and the end of the experiment. Sequential extractions of P-fractions in sediment were performed using the EDTA method (Golterman, 1996). The removal efficiency of P in water was 95–99%. The removal of NH4 + (97–98%) was more effective than that of NO3 − (44–86%). The presence of nitrogen species increased the removal velocity of o-P from water, NH4 + was the most effective species. Sediments not only had higher P removal rates than macrophytes but, in the control treatment without macrophytes, they reached the values obtained by macrophytes plus sediments in the other treatments. The adsorption of P takes place at the surface layer of the sediment (1 cm). Most of the P incorporated into the sediment during the experiment was sorbed by the fraction Fe(OOH)≈P. The addition of nutrients to water modified the leaves/lacinias weight ratio.
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Panigatti, M.C., Maine, M.A. Influence of nitrogen species (NH4 + and NO3 −) on the dynamics of P in water–sediment–Salvinia herzogii systems. Hydrobiologia 492, 151–157 (2003). https://doi.org/10.1023/A:1024860213797
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DOI: https://doi.org/10.1023/A:1024860213797