MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Phytoremediation of two types of sediment contaminated with Zn by Schoenoplectus americanus.
Autor/es:
ARREGHINI S; DE CABO L; IORIO AF DE
Revista:
International Journal of Phytoremediation
Editorial:
Taylor and Francis
Referencias:
Lugar: Philadelphia; Año: 2006 vol. 8 p. 223 - 232
ISSN:
1522-6514
Resumen:
The effect of different sediments on growth, Zn uptake, Zn plant distribution, andmorphometric
variables of Schoenoplectus americanus were investigated under controlled conditions.
Two types of sediments were assayed: from a large natural levee (LS) and alluvial sediments
AS), the former with lower organic matter (OM) and nutrients content than AS, without and
with added Zn (2500 µg Zn/g air-dry sediment). Zinc partition in sediment was determined.
Increases in water conductivity and Zn concentrations in water and sediments were observed
in artificially contaminated treatments. Plants showed a lower aboveground growth rate,
height, and width of shoots, and a higher Zn concentration in shoots and rhizomes. In
the contaminated treatments, AS treatment showed lower Zn concentration in water and
higher Zn concentration in sediments (total, exchangeable, and OM fractions) than LS
treatment, due to Zn displacement from floodwater to sediments. The presence of a high
level of OM and nutrients also increased aboveground biomass growth, whereas it decreased
Zn concentration in shoots. Although the translocation factor increased with Zn addition,
was lower in AS treatment. Sediments of AS treatments are a suitable environment for
growth of S. americanus, which partially compensates the toxic effects of Zn. Our results
provide an encouraging basis for planning larger scale experiments to test the role of OM
and nutrients in improving phytoremediation.µg Zn/g air-dry sediment). Zinc partition in sediment was determined.
Increases in water conductivity and Zn concentrations in water and sediments were observed
in artificially contaminated treatments. Plants showed a lower aboveground growth rate,
height, and width of shoots, and a higher Zn concentration in shoots and rhizomes. In
the contaminated treatments, AS treatment showed lower Zn concentration in water and
higher Zn concentration in sediments (total, exchangeable, and OM fractions) than LS
treatment, due to Zn displacement from floodwater to sediments. The presence of a high
level of OM and nutrients also increased aboveground biomass growth, whereas it decreased
Zn concentration in shoots. Although the translocation factor increased with Zn addition,
was lower in AS treatment. Sediments of AS treatments are a suitable environment for
growth of S. americanus, which partially compensates the toxic effects of Zn. Our results
provide an encouraging basis for planning larger scale experiments to test the role of OM
and nutrients in improving phytoremediation.Schoenoplectus americanus were investigated under controlled conditions.
Two types of sediments were assayed: from a large natural levee (LS) and alluvial sediments
AS), the former with lower organic matter (OM) and nutrients content than AS, without and
with added Zn (2500 µg Zn/g air-dry sediment). Zinc partition in sediment was determined.
Increases in water conductivity and Zn concentrations in water and sediments were observed
in artificially contaminated treatments. Plants showed a lower aboveground growth rate,
height, and width of shoots, and a higher Zn concentration in shoots and rhizomes. In
the contaminated treatments, AS treatment showed lower Zn concentration in water and
higher Zn concentration in sediments (total, exchangeable, and OM fractions) than LS
treatment, due to Zn displacement from floodwater to sediments. The presence of a high
level of OM and nutrients also increased aboveground biomass growth, whereas it decreased
Zn concentration in shoots. Although the translocation factor increased with Zn addition,
was lower in AS treatment. Sediments of AS treatments are a suitable environment for
growth of S. americanus, which partially compensates the toxic effects of Zn. Our results
provide an encouraging basis for planning larger scale experiments to test the role of OM
and nutrients in improving phytoremediation.µg Zn/g air-dry sediment). Zinc partition in sediment was determined.
Increases in water conductivity and Zn concentrations in water and sediments were observed
in artificially contaminated treatments. Plants showed a lower aboveground growth rate,
height, and width of shoots, and a higher Zn concentration in shoots and rhizomes. In
the contaminated treatments, AS treatment showed lower Zn concentration in water and
higher Zn concentration in sediments (total, exchangeable, and OM fractions) than LS
treatment, due to Zn displacement from floodwater to sediments. The presence of a high
level of OM and nutrients also increased aboveground biomass growth, whereas it decreased
Zn concentration in shoots. Although the translocation factor increased with Zn addition,
was lower in AS treatment. Sediments of AS treatments are a suitable environment for
growth of S. americanus, which partially compensates the toxic effects of Zn. Our results
provide an encouraging basis for planning larger scale experiments to test the role of OM
and nutrients in improving phytoremediation.S. americanus, which partially compensates the toxic effects of Zn. Our results
provide an encouraging basis for planning larger scale experiments to test the role of OM
and nutrients in improving phytoremediation.