Phosphorus Retention Capacity of Lakes

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Abstract

Mean annual lake phosphorus concentrations [Formula: see text] in a steady state system can be described as a function of two variables, the mean annual influent P concentration and the net annual P sedimentation: [Formula: see text] (see Rigler 1975). [Formula: see text] is the annual P supply/annual water supply and R p is that fraction of inflowing P retained by the sediments annually. Since R p is critical in determining [Formula: see text], lake properties were examined for their influence on R p ; the best fit empirical expressions developed related R p to either areal water supply (annual water inflow rate/lake surface area) or hydraulic washout coefficient (annual water outflow rate/lake volume). The expressions were derived from characteristics of low productivity lakes; their validity for more productive lakes was not examined.A graph of [Formula: see text] vs. R p is proposed to illustrate the relationship between [Formula: see text], [Formula: see text], and R p , and, if lake P concentrations are used as measures of trophic state, this graph is useful for predicting trophic state and changes in trophic state caused by altering [Formula: see text] and/or R p . It is conceptually similar to those of Vollenweider (1975) and Dillon (1975) but differs in that it separates the potential lake concentration ([Formula: see text] would be equal to [Formula: see text] if P were conservative) from those factors acting to reduce [Formula: see text], expressed as R p , to produce lake concentrations.

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