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Effects of single Ca(OH) 2 doses on phosphorus concentration and macrophyte biomass of two boreal eutrophic lakes over 2 years
Author(s) -
Reedyk Sharon,
Prepas Ellie E.,
Chambers Patricia A.
Publication year - 2001
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1046/j.1365-2427.2001.00790.x
Subject(s) - macrophyte , eutrophication , lime , phosphorus , biomass (ecology) , sediment , environmental science , boreal , environmental chemistry , hard water , nutrient , ecology , zoology , chemistry , hydrology (agriculture) , biology , geology , paleontology , organic chemistry , geotechnical engineering
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.