The Effect Of Phosphorus On
Nitrogen Retention In Lakes
Author(s)
T. Frisk, Ä. Bilaletdin & H. Kaipainen
Abstract
A hypothesis has been presented that nitrogen retention in lakes has become less
efficient at the same time as phosphorus concentrations have decreased due to
high phosphorus reduction in wastewater treatment. This might have led to
higher loading of nitrogen into the Baltic Sea where nitrogen is considered to be
the minimum nutrient. The hypothesis was tested using the mass balance
modelling approach. Oligotrophic, mesotrophic and moderately eutrophic lakes
situated in Finland and Sweden were used in the study. The combined approach
of the classical mass balance model of Vollenweider and the statistical
sedimentation model of Bachmann was used. At first the model was tested for
nitrogen without any impact of phosphorus and it was concluded that this
modelling approach is reasonable to study the hypothesis. If phosphorus
concentration or retention affects nitrogen retention a better fit for the model of
nitrogen retention can be gained when a function of phosphorus input or
concentration is included in the nitrogen model of Bachmann. The results
indicate that inclusion of phosphorus does not improve the fit of the model and
thus it can be concluded that phosphorus can only be a minor factor in regulating
nitrogen retention, at least in lakes which are not hypereutrophic.
Keywords: nitrogen, phosphorus, retention, lakes, mass balance, models.
1 Introduction
In the process of eutrophication phosphorus and nitrogen are the most important
nutrients and regulating factors. In lacustrine environments phosphorus loading
is usually the main factor regulating eutrophication whereas in marine
environments nitrogen is more important. In brackish waters such as the Baltic
Sea both of these nutrients may be limiting algal growth. However, it has been
Keywords
nitrogen, phosphorus, retention, lakes, mass balance, models.
Related Book
Other papers in this volume
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