DIFFERENCES IN COMPOSITION AND PROPORTION OF PHOSPHORUS FRACTIONS IN BOTTOM SEDIMENTS OF LAKE GORECKIE (WIELKOPOLSKA NATIONAL PARK)

摘要

The spatial and vertical changes in the composition of the profundal bottom sediments of Lake Goreckie, in particular the changes in the fraction of phosphorus of different mobility and bioavail-ability, have been studied. The basin of this channel lake is naturally divided into two parts. The bottom sediment was collected by a Limnos sampler equipped with a device for core slicing (in situ). It was shown that in the surface layer of the sediment actively involved in the exchange of matter between the sediment and water, the content of phosphorus was rather low and only up to 24% of its pool was bound to the bioavailable fractions. However, this amount was sufficiently high to stimulate high trophy of the lake with periodical states of water hypertrophy.