Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: jeziora mezotroficzne

Sortuj według:

Ogranicz wyniki do:

The Relationship between Primary Production and Respiration in the Photic Zone of the Great Mazurian Lakes (GMLS), in Relation to Trophic Conditions, Plankton Composition and Other Ecological Factors

Siuda W., Kauppinen E. S., Kaliński T., Chróst R. J., Kiersztyn B.

Polish Journal of Ecology

2017

Vol. 65, nr 3

303--323

The relation of primary production to respiration and dependence of both processes on various environmental factors were investigated in the surface waters of lakes of The Great Mazurian Lake System (GMLS) during summer seasons 2009-2011. Primary production and extracellular release was determined by 14C method, respiration (dark oxygen consumption) - by Winkler's method. Collected results allow to conclude that: (i) in all studied lakes primary production was primarily cyanobacterial, although in mesotrophic ones participation of eukaryotic phytoplankton in light CO2 fixation was more pronounced; (ii) in mesotrophic part of GMLS primary production was limited alternately by N and P availability and less dependent on N and P regeneration processes, whereas in southern, eutrophic lakes it was primarily fueled by regeneration of biogenic substances from organic compounds and strongly limited by N resources; (iii) although in photic zone of whole GMLS respiration was dominated by heterotrophic bacteria, in its mesotrophic part also participation of other plankton components in respiration processes was significant and, (iv) that in eutrophic lakes planktonic respiration was more dependent on low molecular weight products liberated enzymatically from organic substrates than on organic compounds released by primary producers. The mean production to respiration ratio, which varied from 2.11 to 2.60 in northern, and from 2.05 to 3.67 in southern lakes suggested that during period of investigations photic zones of lakes of both parts of GMLS were net autotrophic systems.

Concentrations of alkaline and heavy metals in the water of selected lakes in the Zaborski Landscape Park (Poland)

Gwoździński K., Mazur J., Kilańczyk E.

Chemia i Inżynieria Ekologiczna

2004

Vol. 11, nr 2-3

157--163

The concentrations of alkaline (Na, K, Ca, and Mg) and heavy metals (Zn, Mn, Fe, Co, Pb, and Cd) in waters of lakes with different trophic conditions: Gardliczno, Zmarłe, Nawionek, Czarne, Długie, Piecki, Żabionek, Moczadło, Sosnówek in the Zaborski Landscape Park were determined by the method of atomic absorption spectrometry. In oligotrophic lakes, the concentrations of sodium and potassium were rather law (Na approx. 2.6 mg/dm3 ; K 0.39-0.78 mg/dm3), whereas the concentrations of calcium and magnesium were in the range 1.45-11.5 mg/dm3 and 0.36-0.70 mg/dm3, respectively. In alpha-mesotrophic lakes, the concentration of sodium was 2.1-3.4 mg/dm3 and of potassium - 0.49-0.60 mg/dm3. The contents of calcium and magnesium were slightly higher in alpha-mesotrophic lakes (Ca 1.87-32.1 mg/dm3, Mg 0.38-1.81 mg/dm3) than in oligotrophic ones. The concentrations of heavy metals in oligotrophic lakes were lower. The following amounts of metals were found in oligotrophie lakes: Zn 16.6-32.6 µg/dm3, Mn 0.1-40.8 µg/dm3, Fe 18.7-45.2 µg/dm3, Cu 2.0-5.1 µg/dm3, Pb 5.91-8.1 µg/dm3 and Cd < 1-1.68 µg/dm3. In the waters of alfa-mesotrophic lakes the concentrations of heavy metals were: Zn 31.0-84.0 µg/dm3, Mn 14.7-77.2 µg/dm3, Fe 21.2-160 µg/dm3, Cu 6.1-10.5 µg/dm3, Pb 6.89-19.8 µg/dm3 and Cd < 1-1.94 µg/dm3.

W wodach jezior, położonych na terenie Zaborskiego Parku Krajobrazowego, oznaczano stężenie metali alkalicznych (Na, K, Ca, Mg) oraz metali ciężkich (Zn, Mn, Cu, Pb, Cd) przy użyciu atomowej spektroskopii absorbcyjnej (AAS). Badane jeziora podzielono, pod względem trofii, na: jeziora oligotroficzne (Sosnówek, Moczadło, Długie i Nawionek), jeziora alfa-mezotroficzne (Gardliczno, Czarne, Piecki i Zmarłe) i jezioro mezotroficzne Żabionek. W jeziorach oligotroficznych stężenie sodu i potasu było raczej małe (Na - 2.6 mg/dm3; K 0.39-0.78 mg/dm3). Zakres stężeń wapnia i magnezu był następujący: 1.45-11.5 mg/dm3 oraz 0.36-0.70 mg/dm3. W jeziorach alfa-mezotroficznych zakres stężeń sodu wynosił 2.1-3.4 mg/dm3, a potasu 0.49-0.60 mg/dm3. Stężenie wapnia i magnezu było nieco większe w jeziorach alfa-mezotroficznych (Ca 1.87-32.1 mg/dm3; Mg 0.38-1.81 mg/dm3) w porównaniu z jeziorami oligotroficznymi. Stężenie metali ciężkich w jeziorach oligotroficznych było małe i wynosiło: Zn 16.6-32.6 µg/dm3, Mn 0.1-40.8 µg/dm3, Fe 18.7-45.2 µg/dm3, Cu 2.0-5.1 µg/dm3, Pb 5.91-8.1 µg/dm3 oraz Cd < 1-1.68 µg/dm3. W wodach jezior alfa-mezotroficznych stężenie metali mieściło się w zakresie: Zn 31.0-84.0 µg/dm3, Mn 14.7-77.2 µg/dm3, Fe 21.2-160 µg/dm3, Cu 6.1-10.5 µg/dm3, Pb 6.89-19.8 µg/dm3 i Cd < 1-1.94 µg/dm3