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Preliminary characterization of the trophic state of Maly Kopik Lake near Olsztyn and its drainage basin as a supplier of biogenic substances

100%

Grochowska J., Tandyrak R.

Journal of Elementology

2008

tom 13

nr 1

The study was carried out on a small (7.8 ha) and shallow (9.0 m) lake Mały Kopik, situated 9 km on south western from Olsztyn, drainage basin of Giłwa and Pasłęka rivers. The catchment area of the lake is 194.7 ha. Forests cover the most of the drainage basin area (64.2%), agriculture land comprises 28.7% (21% grass land and 7.7% arable land) and urban land - 7.1%. Lake Mały Kopik is not susceptible to degradation (III category), and drainage basin having a great potential for supplying matter to the reservoir, was included in basin category 4. The lake with its drainage basin belong to the 4th type of lake-drainage basin ecosystems. In such a system the natural eutrophication of the lake is expected to proceed at a fast rate. As evidenced in the study, lake Mały Kopik is highly eutrophic reservoir. The lake waters were characterized by a high content of nutrients, up to 0.673 mg P·dm-3 and 10.61 mg N·dm-3. The high fertility of the lake was exhibited also by the values of BOD5 reaching 7.5 mg O2·dm-3, chlorophyll a content - 50 µg·m-3, and low water transparency - 2 m.

Ograniczanie wyników

1 Journal of Elementology

1 Grochowska J.

1 Tandyrak R.

1 2008

Wyniki wyszukiwania

Preliminary characterization of the trophic state of Maly Kopik Lake near Olsztyn and its drainage basin as a supplier of biogenic substances