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Chemical composition of tropical macrophyte Echinochloa polystachya (H.B.K.) Hitchcock in Jurumirim Reservoir (São Paulo, Brazil)

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Abstract

Seasonal variations of C, N and P concentrations and stocks in the emergent macrophyte Echinochloa polystachya (H.B.K.) Hitchcock, of the Paranapanema River mouth zone at Jurumirim Reservoir (SP, Brazil), were examined. Marked variation in nutrient concentrations (from 287.6 to 463.2 mg C g DW-1; 3.4 to 37.8 mg N g DW-1; 0.13 to 2.31 mg P g DW-1) and stocks (from 3.8 to 11.9 t C ha-1; 96.3 to 400.6 kg N ha-1, 3.6 to 44.3 kg P ha-1) were observed along the year (August 1993 – July 1994). Peaks in concentrations and stocks were observed in January, February and March 1994. As nutrient concentrations in water and sediments are low and stocks in the plant high, the local nutrient dynamics seem to be controlled by this macrophyte. Leaf blades and sheaths participate most in recycling, while stems contain the principal nutrient stock.

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Authors and Affiliations

  1. Dept. of Zoology, Institute of Biosciences, UNESP, Botucatu -, SP -, 18618-000, Brazil

    Marcelo L. M. Pompêo, Raoul Henry & Viviane Moschini-Carlos

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  1. Marcelo L. M. Pompêo
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  2. Raoul Henry
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  3. Viviane Moschini-Carlos
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Pompêo, M.L.M., Henry, R. & Moschini-Carlos, V. Chemical composition of tropical macrophyte Echinochloa polystachya (H.B.K.) Hitchcock in Jurumirim Reservoir (São Paulo, Brazil). Hydrobiologia 411, 1–11 (1999). https://doi.org/10.1023/A:1003895532309

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