Volume 21 (2002)
Whole lake primary production assessment by
Langner, Torsten Jakob, Jörg Toepel, Christian Wilhelm
hypertrophic lake in Leipzig has been analyzed with respect to the
basic limnological parameters, nutrients and phytoplankton community
dynamic in the course of the year 2002. A bio-optical model was
developed to assess the daily primary production based on the
spectrally resolved surface irradiance, the light climate in the
euphotic zone of the water column, the quantification of the light
absorption by the phytoplankton and its photosynthetic efficiency
measured with the help of in-vivo Chl a-fluorescence.
Summing up the modeled primary production per day for the whole
vegetation period it turned out that the productivity was no limited by
the nutrients but by the light only. This is the first report that an
adopted bio-optical modeling can be used to assess the annual primary
production of a whole freshwater lake.