Abstract
1. Two hardwater eutrophic lakes of central Alberta were subjected to single doses of Ca(OH)2 (74 or 107 mg L–1). The effects of lime treatment on phosphorus (P) precipitation, sediment P release, and macrophyte biomass were assessed for up to 2 years.2. In both lakes, sediment P release was reduced to 16 and 27%, respectively, of pre‐treatment values by the first winter following treatment. However, sediment P release returned to pre‐treatment values during the following year.3. In contrast to these short‐term effects, macrophyte biomass decreased by as much as 80% after lime application and remained there for at least 2 years.4. Our results indicate that a single dose of Ca(OH)2 may give short‐term (< 1 year) control of P and long‐term control (> 1 year) of macrophytes in hardwater eutrophic lakes of Alberta.
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