Every lake located in an urban area or in the vicinity of a town is a unique element of the landscape.
However, lakes situated in cities are particularly endangered as they have a role of
receiving water for municipal, industrial and precipitation wastes. The load of nutrients introduced
with sewage is so high that it disturbs the biological balance and disrupts biogeochemical
processes in an ecosystem. The object of the study was an urban Lake Sajmino (21.6 ha, max.
depth 7.8 m) used for recreation. Its catchment is smaller than the topographic catchment area
because some of the precipitation water is redirected outside by a storm water drainage system.
The lake is fed by 3 permanent inflows (I-III). The goal of the study was to find correlations
between the hydrochemical and biological parameters of the lake water and the quality of water
supplied by the inflows. Simultaneously, an attempt was made to identify the hazards, in order
to undertake actions in the near future preventing deterioration of the lake’s trophic state.
The amounts of pollutants flowing into the lake from various sources exceeded the acceptable
levels, therefore leading to an increase in its trophy, exhibited by algal blooms and limitation in
the transparency of the lake water expressed as Secchi disc visibility. A significant (p ≤ 0.05)
inverse correlation between Chl a and SD (r = –0.755) was found for the lake water, and
between the Chl a of the lake and the pollutants of the inflows: NNH4 (I), r = 0.786, NNO2 (I),
r = 0.731, NNO2 (II), r = 0.881, suspension (III), r = –0.719. TSI indicates that the eutrophic
character of the lake is still unsettled. TSI (TP) > TSI (TN) > TSI (SD) > TSI (Chl a). The SD
value (2.2÷3.55 m) may be caused by dissolved organic matter, the suspension or the water’s
colour. Phytoplankton (Chl a ≤ 4.840 μg dm-3) could be limited by nitrogen, zooplankton feeding
or toxic compounds.
Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies
Informacja
SZANOWNI CZYTELNICY!
UPRZEJMIE INFORMUJEMY, ŻE BIBLIOTEKA FUNKCJONUJE W NASTĘPUJĄCYCH GODZINACH:
Wypożyczalnia i Czytelnia Główna: poniedziałek – piątek od 9.00 do 19.00