Hourly and daily variability in nitrogen and phosphorus in a lake restored by the hypolimnetic with drawal method

• Autorzy: Sieńska J. , Dunalska J. A. , Szymański D.

Identyfikatory

DOI

10.1515/ohs-2015-0036

• Języki publikacji: EN

Abstrakty

EN

An excess of nitrogen and phosphorus causes an increase in productivity, leading to degradation of a water reservoir. In order to reduce the eutrophication, protective and restoration methods are used. The objective of the paper was to determine the hourly and daily variability in nitrogen and phosphorus compounds in a lake restored by the hypolimnetic withdrawal method. In the epilimnion, the organic form dominates: 97% of P_tot and 75% of N_tot. Hourly variations in the concentration of the investigated compounds indicate that the highest values occurred at night and in the morning, whereas lower measurements were recorded at noon and in the evening. Such a distribution of the concentrations of nutrients during a day is strongly associated with photosynthesis. Along with depth, the proportion of this form decreased in favor of mineral forms. A high content of mineral phosphorus (70%) and ammonium ions (75%) in the hypolimnion results from their release from bottom sediments under anaerobic conditions. As a result of the generated thermocline, they are blocked and accumulated. At the experimental station, the concentration of mineral compounds was at a lower level than at the reference station since their amount was systematically reduced by the outflow of over-fertilized waters from the hypolimnion.

Słowa kluczowe

EN

nutrients; photosynthesis; primary production; eutrophication; restoration methods

• Wydawca: Institute of Oceanography University of Gdańsk
• Czasopismo: Oceanological and Hydrobiological Studies
• Rocznik: 2015
• Tom: Vol. 44, No. 3
• Strony: 381--392
• Opis fizyczny: Bibliogr. 32 poz., rys., tab., wykr.

Twórcy

autor

Sieńska J.

• Department of Water Protection Engineering, University of Warmia and Mazury, ul. Prawocheńskiego 1, 10-720 Olsztyn, Poland

autor

Dunalska J. A.

• Department of Water Protection Engineering, University of Warmia and Mazury, ul. Prawocheńskiego 1, 10-720 Olsztyn, Poland

autor

Szymański D.

• Department of Water Protection Engineering, University of Warmia and Mazury, ul. Prawocheńskiego 1, 10-720 Olsztyn, Poland

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