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Internal P loading in lakes: A different approach to its evaluation
Authors:G. Premazzi  A. Provini
Affiliation:(1) Commission of the European Communities, Joint Research Centre, Ispra Establishment, 21020 Ispra (Va), Italy;(2) National Council of Researches I.R.S.A., 20047 Brugherio, Milano, Italy
Abstract:P release rates in five lakes were estimated from a mass balance approach and from laboratory tests. The influence of various environmental parameters on P release has been considered. The internal P loading can contribute phosphorus to overlying waters at levels comparable to the external sources (from 30 to 100%). When considering the recovery from eutrophication of the investigated lakes, the nutrient release from sediments is of critical importance.
Keywords:P exchange  redox conditions  diffusion  sediment composition  internal load  subalpine lakes
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