Conceptual Model of Aquatic Plant Decay and Ammonia Toxicity for Shallow Lakes
Publication: Journal of Environmental Engineering
Volume 126, Issue 3
Abstract
A conceptual process model was developed to examine the potential for late summer ammonia toxicity in shallow lakes. Processes represented in the model were macrophyte decay; growth, death, and sedimentation of phytoplankton; growth and death of zooplankton; nitrification; volatilization; and chemical equilibria (carbonate and ammonium systems). Peak NH3 concentrations occur at the peak of the phytoplankton bloom that develops about 2 weeks after macrophyte decay starts, when the pH is elevated. Ammonia peaks are highly transient, lasting <1 day. It is hypothesized that late summer ammonia toxicity following macrophyte senescence may be a common but generally unrecognized phenomenon in shallow lakes.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 126 • Issue 3 • March 2000
Pages: 199 - 207
History
Received: Jan 16, 1998
Published online: Mar 1, 2000
Published in print: Mar 2000
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