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1
Content available Seasonal Changes of Phosphorus Release from the Bottom Sediments of Rusalka Lake During the Restoration Process
Kowalczewska-Madura K., Dondajewska R., Gołdyn R.
Ecological Chemistry and Engineering. A
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2011
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Vol. 18, nr 2
219-224
EN
Paper presents a comparative study of phosphorus (P) internal loading from bottom sediments in Rusalka Lake in years 2006 and 2007, when restoration measures were conducted and in 2005, a year before restoration. Internal loading of P decreased as an effect of applied treatment. The mean loading in 2005 was 9.07 mg P m–2 d–1, whilst in next two years it was 4.36 mg P m–2 d–1 and 2.28 mg P m–2 d–1, respectively. The reduction reached 51 % in 2006 and 75 % in 2007. A domination of P release was noted in 2005 and 2006, amounting in summer to 38.1 mg P m–2 d–1 in the deepest place of the lake and 15.6 mg P m–2 d–1 in the littoral zone. A period of accumulation supremacy was observed in spring 2007, reaching 4.9 mg P m–2 d–1 in the littoral and 2.8 mg P m–2 d–1 in the profundal.
PL
Praca prezentuje zmiany uwalniania fosforu z osadów dennych w jeziorze Rusałka w latach 2006–2007, kiedy prowadzono rekultywację zbiornika z użyciem siarczanu(VI) żelaza(III). W wyniku przeprowadzonych zabiegów rekultywacyjnych zasilanie wewnętrzne w fosfor z osadów dennych wyraźnie zmniejszyło się. Średnie zasilanie wewnętrzne przed wykonaniem zabiegów rekultywacyjnych wynosiło 9,07 mg P m–2 d–1, w kolejnym zmniejszyło się do 4,36 mg P m–2 d–1 (redukcja o 51 %), a w ostatnim roku do 2,28 mg P m–2 d–1 (redukcja o 75 %). W latach 2005 i 2006 stwierdzano wydzielanie fosforu z osadów dennych, dochodzące w okresie letnim do 38,1 mg P m–2 d–1 w obrębie głęboczka i do 15,6 mg P m–2 d–1 w litoralu. W ostatnim roku badań wiosną, nie następowało wydzielanie P z osadów, a kumulacja P osiągnęła 4,9 mg P m–2 d–1 w litoralu i 2,8 mg P m–2 d–1 na głęboczku.
2
Efekty rekultywacji metodą inaktywacji fosforu w trzech jeziorach Wielkopolski
Gołdyn R., Kowalczewska-Madura K., Kozak A., Budzyńska A., Podsiadłowski S., Dondajewska R.
Przegląd Komunalny
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2010
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nr 10
74-78
PL
Dotąd w rekultywacji jezior wykorzystywano kilka metod inaktywacji fosforu. Wymienić tu można zastosowane przez Ripla dawkowanie do osadów dennych związków utleniających (azotan wapnia) oraz wiążących fosfor (roztwór chlorku żelaza), a w przypadku zbyt niskiego pH - dodatkowe podawanie zawiesiny Ca(OH)2 dla podwyższenia pH do optimum dla mikrobiologicznej denitryfikacji. Metodę tę, udoskonaloną przez Wiśniewskiego, dzięki użyciu nowego urządzenia pn. Proteus ostatnio zastosowano na jeziorach Jelonek i Winiary w Gnieźnie.
3
Content available remote The bottom sediments of Lake Uzarzewskie – a phosphorus source or sink?
Kowalczewska-Madura K., Gołdyn R., Dondajewska R.
Oceanological and Hydrobiological Studies
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2010
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Vol. 39, No.3
81-91
EN
Phosphorus release from bottom sediments studied in two zones of Lake Uzarzewskie differing in depth and water oxygenation displayed seasonal and spatial variability. The experiments indicated that the lake receives considerable internal loading, especially from the deeper, anaerobic, rarely-mixed part of the lake. Meanwhile, the shallow zone situated in the 0-3 m depth range, could be a sink for phosphorus during spring and a source during other seasons of the year. The total loading of phosphorus from the bottom sediments was over 950 kg year^-1 P, and 83% of this amount originated from the deeper part of the lake. The mean release from this part was 24.89 mg m^-2 d^-1 P and the maximum in fall was 35.4 mg m^-2 d^-1 P.
4
Content available remote Phosphorus release from the bottom sediments of Lake Rusałka (Poznań, Poland)
Kowalczewska-Madura K., Gołdyn R., Dondajewska R.
Oceanological and Hydrobiological Studies
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2010
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Vol. 39, No.4
135-144
EN
Experimental research conducted on bottom sediments from the eutrophic Lake Rusałka (Poznań, Poland) indicated that the phosphorus release process has a significant influence on the functioning of the ecosystem. Internal loading was very intense in the deepest part of the lake, where it reached up to 29.84 mg m^-2 d^-1 P under anaerobic conditions. This part of the lake, however, was insignificant to overall internal loading. The highest loading was from the lake shallows, which covered 92% of the bottom area. Total mean annual loading to the ecosystem was 1214.5 kg year^-1 P, i.e., 3.31 g m^-2 year^-1 P.
5
Content available remote Models of phosphorus turn-over in a hypertrophic lake: the Lake Swarzędzkie case study
Gołdyn R., Kowalczewska-Madura K.
Oceanological and Hydrobiological Studies
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2010
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Vol. 39, No.3
21-33
EN
Phosphorus cycling between components of the ecosystem of the hypertrophic Lake Swarzędzkie was studied in 2000-2003. The results of this study revealed considerable seasonal variation in phosphorus cycling. The main sources of phosphorus load in winter were the tributaries, whereas in summer internal loading prevailed. However, the most effective source of SRP (soluble reactive phosphorus) for phytoplankton primary production in summer was its excretion by organisms from the microbial loop. The share of this source in the total phosphorus pool was 38%, whereas internal loading contributed 23.7%, external loading 16.3%, and regeneration by metazooplankton 22%. This exerted a significant influence on the functioning of the whole lake ecosystem. Limiting both external and internal phosphorus loading is recommended to facilitate water quality improvement in the lake.
6
Content available remote Internal phosphorus loading in selected lakes of the Cybina River valley
Kowalczewska-Madura K., Dondajewska R., Gołdyn R.
Oceanological and Hydrobiological Studies
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2010
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Vol. 39, No.3
35-45
EN
The aim of this study was to assess the ability of bottom sediments to release or accumulate phosphorus. Ex situ experiments with the use of undisturbed sediment cores were done in 11 lakes situated in the Cybina River valley (Wielkopolska, Poland). Phosphorus release was observed both in aerobic and anaerobic conditions, however greater values were noted in the latter ones. Maximum values reached 41.4 mg m^-2 d^-1 P and 12.2 mg m^-2 d^-1 P in anaerobic and aerobic conditions, respectively.
7
Content available remote Functioning of the Lake Rusałka ecosystem in Poznań (western Poland)
Gołdyn R., Szeląg-Wasielewska E., Kowalczewska-Madura K., Dondajewska R., Budzyńska A., Podsiadłowski S., Domek P., Romanowicz-Brzozowska W.
Oceanological and Hydrobiological Studies
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2010
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Vol. 39, No.3
65-80
EN
Lake Rusałka is a shallow, artificial, strongly eutrophic reservoir. Thermal stratification is weak and comprises only about 8% of the bottom surface. In summer, the epilimnion is oversaturated with oxygen due to intensive phytoplankton growth (chlorophyll a up to 80.2 μg l^-1), while conditions in the hypolimnion are anaerobic. The high concentration of ammonium nitrogen and low N:P ratio stimulated intense growth of cyanobacteria in the period from June to November. The domination of rotifers in the metazooplankton and low diversity and biomass of benthic macroinvertebrates was the cause of low top-down pressure of these organisms on the phytoplankton. The most advantageous restoration measures were identified to improve water quality and make the recreational use of the lake possible.
8
Content available remote Zooplankton phosphorus excretion in Swarzędzkie Lake (Western Poland) and its influence on phytoplankton
Kowalczewska-Madura K., Gołdyn R., Szyper H.
Oceanological and Hydrobiological Studies
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2007
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Vol. 36, No.1
3-16
EN
Zooplankton phosphorus excretion was studied in Swarzędzkie Lake in 2000-2002. Phosphorus excretion rates were high from spring through autumn, but low in winter. The highest value, 203.7 žgP l-1 d-1 (vertical profile mean), was recorded in June 2000. The mean rate was 26.6 žgP l-1 d-1 and was 10 times greater for rotifers than for both cladocerans and copepods. In most months, the calculated phosphorus excretion rate was greater than the sum of tributary external phosphorus loading and internal bottom sediment loading. Nevertheless, the influence of the zooplankton phosphorus excretion rate on yearly phytoplankton abundance, biomass and chlorophyll a was not statistically significant. Yearly variance in phytoplankton variables was best explained by a canonical variable composed of internal loading and zooplankton phosphorus excretion (total redundancy 32.8%).
9
Content available remote Chlorophyll a and other water quality variables in lentic and lotic sections of the Cybina River
Gołdyn R., Kowalczewska-Madura K.
Oceanological and Hydrobiological Studies
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2005
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Vol. 34, No.1
87--98
EN
Annual research of some water quality variables was carried out at seven stations along a third order river (the Cybina River) situated in the Wielkopolska Region (mid-western Poland). Two lentic (lacustrine), two lotic (river), and two intermediate (lentic-lotic) sections were studied. Chlorophyll a increased 6.2-10.5-fold along the lentic sections (the influence of hypertrophic lakes) and decreased along the lotic sections. Similar trends were observed in the parameters of dissolved oxygen, BOD, suspended solids, and pH. Inverse trends were recorded for conductivity and the concentrations of most forms of nutrients. Changes in these parameters were less distinct and statistically insignificant along the intermediate sections.
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