Impact of Lime on Sediment Phosphorus Release in Hard water Lakes: the Case of Hypereutrophic Halfmoon Lake, Alberta

Autor:	Tom Murphy, Ellie E. Prepas, Jay Babin, P. J. Curtis, Ying Zhang, Patricia A. Chambers, Mark Serediak
Rok vydání:	1994
Předmět:	Hydrology Chlorophyll a geography geography.geographical_feature_category Hard water Drainage basin Sediment Aquatic Science chemistry.chemical_compound chemistry Boreal Environmental science Photic zone Water quality Tonne Water Science and Technology
Zdroj:	Lake and Reservoir Management. 8:131-142
ISSN:	2151-5530 1040-2381
DOI:	10.1080/07438149409354465
Popis:	Halfmoon Lake is a small, moderately deep, hypereutrophic, hardwater lake with a relatively small (2.4 km2), partially cleared drainage basin situated in the Boreal Mixedwood Ecoregion of central Alberta. The water is often thermally stratified, and average residence time is 60 years. During mid- to late summer 1988 and 1989, 188 metric tons of Ca(OH)2 and 58 metric tons of CaCO3 were applied to the surface of Halfmoon Lake to decrease total phosphorus (TP) concentration and algal biomass (estimated as chlorophyll a [Chl a]). Mean summer (July-September) Chl a and TP in the euphotic zone in 1989 and 1990 decreased to 53 and 63%, respectively, of the pretreatment year (1982). Similarly, sediment P release from June through August was 50% lower in 1989 and 1990 than in the pretreatment year. In contrast water quality deteriorated in three nearby reference lake basins, also hypereutrophic, so that average summer euphotic zone Chl a and TP were 217 and 116% higher, respectively, in 1989 and 1990 than...
Databáze:	OpenAIRE
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