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Concentration of soil CO2 as an indicator of the decalcification rate after liming treatment

100%

Chmiel S., Halas S., Glowacki S., Sposob J., Maciejewska E., Trembaczowski A.

International Agrophysics

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2016

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tom 30

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nr 2

2

Comparison of three different techniques for histological tooth preparation

84%

Keklikoglu N., Akinci S.

Folia Histochemica et Cytobiologica

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2013

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tom 51

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nr 4

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Comparing the effect of phytoplankton and a charophyte on calcite precipitation in lake water: experimental approach

84%

Kufel L., Rymuza K.

Polish Journal of Ecology

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2014

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tom 62

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nr 3

Primary producers are able to strongly affect calcium budget in hardwater lakes. The relative contribution of phytoplankton and charophytes to water decalcification (by precipitation of calcium carbonate) is, however, unclear. In this study we checked the effect of natural phytoplankton community and a charophyte (Nitellopsis obtusa) on the decline of calcium concentration in experimental outdoor conditions. The experiment was carried out in original lake water and two variants of enrichment with inorganic nitrogen and phosphorus to test the changing efficiency in decalcification by both primary producers. At low nutrient concentrations, N. obtusa was responsible for calcium decline in original lake water by 12 mg Ca+2 dm–3 during 20 days of experiment. In these conditions the effect of phytoplankton was negligible. In lake water enriched with nutrients, the exponential growth of phytoplankton led to the decrease of calcium concentration from initial 35 mg Ca+2 dm–3 to 9 mg Ca+2 dm–3 in the same time period. The maximum effect of N. obtusa was the same as in original lake water but manifested itself earlier to decline in the end of experiment. Supersaturation of water with calcium carbonate was always more than threefold and saturation index reached 27 in mixed cultures of phytoplankton and N. obtusa in lake water enriched with nutrients. In this context we hypothesise on a possible role of charophytes as nucleation sites necessary for calcite precipitation. Based on our own and literature data we also discuss expected immobilisation of phosphate incorporated in calcite precipitated by the growth of phytoplankton and N. obtusa.

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Rozwój bezściekowych procesów jonowymiany w przemyśle cukrowniczym

67%

Schick R., Bohn K.

Gazeta Cukrownicza

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1988

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tom 96

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nr 06

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Precipitation of phosphorus in the zone of river and lake water mixing: R. Hancza and Lake Wigry [North-East Poland]

67%

Zdanowski B.

Polish Journal of Ecology

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2003

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tom 51

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nr 2

Studies on physico-chemical parameters of water in Czarna Hancza River and lakes Hancza and Wigry (North-East Poland) were carried out in 1991-1994 i.e. in the period of maximal pollution of this river-lake system. Basic information were obtained enabling explanation of high resistance of Lake Wigry to eutrophication. It was shown that co-precipitation of phosphates on calcite in the ecotone zone of Hanczanska Bay, where river waters mixed with lake waters, was an important process. Sedimentation of these substances in this lake part resulted in lower lake loading with phosphorus by as much as about 50%. The mechanisms were operating most of all during the vegetation season, when water pH exceeded 8.3. Availability of phosphorus to phytoplankton depended also on phosphate release from bottom sediments. The lowest rate of this release was observed in Hanczanska Bay. On the other hand, in autumn and winter the increase of organic matter decomposition and lowering of water pH enabled free spreading of pollutants over the whole lake.

Ograniczanie wyników

2 Polish Journal of Ecology

1 Folia Histochemica et Cytobiologica

1 Gazeta Cukrownicza

1 International Agrophysics

1 Akinci S.

1 Bohn K.

1 Chmiel S.

1 Glowacki S.

1 Halas S.

1 Keklikoglu N.

1 Kufel L.

1 Maciejewska E.

1 Rymuza K.

1 Schick R.

1 Sposob J.

1 Trembaczowski A.

1 Zdanowski B.

1 2016

1 2014

1 2013

1 2003

1 1988

Concentration of soil CO2 as an indicator of the decalcification rate after liming treatment

Comparison of three different techniques for histological tooth preparation

Comparing the effect of phytoplankton and a charophyte on calcite precipitation in lake water: experimental approach

Rozwój bezściekowych procesów jonowymiany w przemyśle cukrowniczym

Precipitation of phosphorus in the zone of river and lake water mixing: R. Hancza and Lake Wigry [North-East Poland]