Vertikale und zeitliche Verteilung der Leitfähigkeit in einem eutrophen Gewässer während der Sommerstagnation

Summary

Data are given of the vertical distribution of temperature, conductivity and alkalinity of an eutrophic lake (Rotsee near Lucerne) measured at short intervals during the summer stratification. We were able to prove in a limited measure only the expected day's periodicity from the conductivity of the CO₂-assimilation of the phytoplankton. We found pronounced internal ‘seiches’ in the hypolimnion; their mathematical interpretation is given only in the order of size.Rodhe's diagram andNümann's method make it possible to determine quantitative relations; from the chemical point of view the lake (depth 16,5 m) shows a four-layered type during the summer.