Versuch der Quantifizierung der Beeinflussung des Ökosystems durch chemische Faktoren: Stehende Gewässer |
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| Authors: | Prof Dr H Ambühl |
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| Institution: | 1. Eidg. Techn. Hochschule Zürich und Eidg. Anstalt für Wasserversorgung, Abwasserreinigung und Gew?sserschutz, überlandstrasse 133, CH-8600, Dübendorf, Schweiz
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| Abstract: | The chemical and biological conditions of the Lake of Lucerne and of the lower basin of the Lake of Constance are discussed on the basis of observations on the phosphorus content in the course of the past ten years. The heavy load by suspended solids on two basins on the Lake of Lucerne caused a decrease of soluble P-compounds by adsorption. In two other basins of the same lake considerable phosphorus resolubilization from sediments is on the way since 1968. Phosphorus dynamics in the lower basin of Lake Constance is governed by wash-out and by resolubilization and sedimentation respectively. We recommend to adopt a minimum lower limit of 4 to 6 mg O2/l at any point and at any time in the water body of a lake as a specific criterion for defining the final aim of lake protection or lake restauration measures. With the fulfillment of this requirement, satisfactory conditions for all utilizations of a lake ecosystem will exist. |
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