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Titolo:
The effects of lime addition on aquatic macrophytes in hard water: in situand microcosm experiments
Autore:
Chambers, PA; Prepas, EE; Ferguson, ME; Serediak, M; Guy, M; Holst, M;
Indirizzi:
Natl Water Res Inst Branch, Saskatoon, SK S7N 3H5, Canada Natl Water Res Inst Branch Saskatoon SK Canada S7N 3H5 SK S7N 3H5, Canada Univ Alberta, Dept Sci Biol, Edmonton, AB, Canada Univ Alberta Edmonton AB Canada rta, Dept Sci Biol, Edmonton, AB, Canada
Titolo Testata:
FRESHWATER BIOLOGY
fascicolo: 8, volume: 46, anno: 2001,
pagine: 1121 - 1138
SICI:
0046-5070(200108)46:8<1121:TEOLAO>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAKE WATER; PHOSPHORUS; SEDIMENTS; ALBERTA; CARBON;
Keywords:
aquatic macrophytes; hard water; irrigation canals; lime; ponds;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Chambers, PA Natl Water Res Inst Branch, 11 Innovat Blvd, Saskatoon, SK S7N 3H5, Canada Natl Water Res Inst Branch 11 Innovat Blvd Saskatoon SK Canada S7N 3H5
Citazione:
P.A. Chambers et al., "The effects of lime addition on aquatic macrophytes in hard water: in situand microcosm experiments", FRESHW BIOL, 46(8), 2001, pp. 1121-1138

Abstract

1. Aquatic macrophytes are abundant in ponds and canals that are constructed in semi-arid regions for water storage and conveyance, as well as in lakes that are culturally enriched.2. Addition of Ca(OH)(2) to two hardwater ponds at 250 or 275 mg L-1 caused an immediate eradication of submersed aquatic plants. Although these ponds are well-buffered (alkalinity: 2.57-3.94 mequiv L-1; pH: 8.1-9.0), lime addition caused an immediate increase in pH of 0.2-3 units.3. Application of 135 mg L-1 Ca(OH)(2) for 24 h or 210 mg L-1 Ca(OH)(2) for 65 h to two irrigation canals had no effect on macrophyte biomass at the lower concentration and duration, but resulted in the elimination of aquatic macrophytes 1 month after the higher concentration, longer duration treatment.4. Unlike the macrophyte control achieved following application of 210-275mg L-1 Ca(OH)(2) to ponds or canals, microcosm experiments in which lime formulation [slaked lime (Ca(OH)(2)), calcite (CaCO3), or a 1 : 1 mixture] and concentrations (up to 1500 mg L-1) were manipulated failed to elicit a consistent change in macrophyte biomass. Macrophytes in microcosms treated for the short-term (23-33 days) with greater than or equal to 200 mg L-1 Ca(OH)(2) or a mixed Ca(OH)(2)/CaCO3 formulation always lost pigmentation, butbiomass was not consistently reduced.5. Declines in macrophyte biomass following treatment of ponds and canals may have been triggered by a short-term rise in pH which, in these relatively warm (22-23 degreesC) alkaline (2.28-3.94 mequiv L-1) systems, would have resulted in low concentrations of free CO2 and bicarbonate for photosynthesis.

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Documento generato il 19/09/20 alle ore 08:02:45