Biomass production and nutrient accumulation in <Emphasis Type="Italic">Sparganium emersum</Emphasis> Rehm. after sediment treatment with mineral and organic fertilisers in three mesocosm experiments |
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Authors: | Markéta Ságová-Mare?ková Adam Petrusek Jan Květ |
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Institution: | 1.Crop Research Institute,Prague 6,Czech Republic;2.Faculty of Science, Department of Ecology,Charles University in Prague,Prague 2,Czech Republic;3.Institute of Systems Biology and Ecology,Academy of Sciences of the Czech Republic,Trebon,Czech Republic |
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Abstract: | The response of the aquatic plant Sparganium emersum to different sediment nutrient levels was studied in three mesocosm experiments. The aim was to assess plant growth parameters
and nutrient accumulation in the plant tissue under conditions relevant for habitats with sediments affected by anthropogenic
nutrient enrichment. The experimental treatments were produced by fertilisation of the rooting medium (washed river sand)
with differing doses of either NPK mineral fertiliser or digested sludge from solid pig slurry waste. Growth inhibition by
high nutrient levels was not observed in any treatment (highest nutrient concentrations in the sediment with mineral fertiliser:
N 250 mg kg−1, P 50 mg kg−1; organic fertiliser: N 6300 mg kg−1, P 1800 mg kg−1), which confirms the tolerance of S. emersum to high nutrient loads. The sediment nutrient concentration was best reflected in shoot dry mass. Nutrient contents in plant
tissues were similar for most nutrient concentrations in the rooting media; only N increased significantly with N levels in
the sediment in belowground parts. Nutrient standing stocks in plants, however, generally corresponded to the nutrient supply,
and reached highest values (max. N 3.7 g m−2, P 1.2 g m−2) in the richest treatments with organic fertiliser. The capability of S. emersum to use nutrients from high sediment concentrations and in organically polluted environments recommends this species for use
in water quality management including tertiary wastewater treatment. |
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