Assessment of the Multi-Directional Experiment to Restore Lake Góreckie (Western Poland) with Particular Focus on Oxygen and Light Conditions: First Results
Tadeusz Sobczyński1, Tomasz Joniak2, Eugeniusz Pronin1
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1Department of Water and Soil Analysis, Faculty of Chemistry, Adam Mickiewicz University,
Drzymały 24, 60-613 Poznań, Poland
2Department of Water Protection, Faculty of Biology, Adam Mickiewicz University,
Umultowska 89, 61-614 Poznań, Poland
Pol. J. Environ. Stud. 2012;21(4):1025–1031
Our paper presents the study results of the first year of restoration of Lake Góreckie in Wielkopolska National Park. The restoration was carried out on several levels which involved: aeration of the hypolimnion using the pulverizing aerator with wind drive, phosphorus inactivation by iron coagulant, and reduction of plankton-eating fish. The comparison of the results obtained in the year 2010, that is in the time of the implementation of restoration procedures, with the results of similar studies conducted before the restoration, in 2008 revealed an increase in water transparency that resulted in the greater range of visible radiation from the photosynthetically active scope, which unfortunately did not improve the oxygen condition in the water depth. The effects of the hypolimnion aeration were not observed, even at the sampling station situated 20 m from the aerator. In the sub-bottom zone, the decrease in phosphate concentration was observed, with the concentration of ammonium nitrogen staying at the same level, which indicates the effectiveness of phosphate precipitation.