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Transformation of lake ecosystem into peat bog and vegetation history based on Durne Bagno mire (Lublin Polesie, E Poland)

Bałaga K.

Geochronometria

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2007

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Vol. 29

23-43

EN

In this paper, the history of Durne Bagno, i.e. the largest peat bog in the Lublin Polesie, is shown. Peat bogs are a unique element of the Polesie landscape. They occur mostly in the subregion of the Łęczna-Włodawa Lake District occupying 1.07% of its area. They fill basin-shaped depressions without outflow, often in the immediate vicinity of dystrophic lakes. Based on interdisciplinary research, the changes of vegetation cover and the Durne Bagno lake-mire ecosystem in the Late Glacial and Holocene are presented. The environmental conditions are reconstructed from pollen analysis, detailed identification of algae of Pediastrum genus and chemical composition of deposits, together with the results of Cladocera analysis. The distribution of archaeological artefacts in the surroundings of Durne Bagno peat bog gives the view on the intensity of settlement in this area. The duration of the limnic and mire stages during the development of the ecosystem was different in different parts of the examined depression. In its central part the limnic stage lasted about 8000 years and included the period from the Late Glacial to the middle Holocene (to about 6000 BP). It is represented by 7 pollen zones and 6 chemical zones. The mire stage contained a part the Atlantic period and on the Subboreal and Subatlantic periods. It is represented by 4 pollen zones and 5 chemical zones. Limnic and mire deposits differ widely in the concentrations of chemical elements. The contents of mineral material and almost all analyzed elements in limnic deposits are high. These deposits are characterized by positive correlation between the contents of Zn and Cr and the frequency of Cladocera fauna. Peat contains very low amount of mineral material. The contents of Ca, Sr and Ba are rather high in sedgemoss peat. The concentrations of these elements decrease upwards due to oligotrophic processes and sedentation of sedge-Eriophorum-Sphagnum peat. Peat succession was modified by pastoral economy of prehistoric man.

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Changes in the natural environment recorded in the sediments of the Karaśne lake-mire complex (Lublin Polesie, E Poland)

Bałaga K.

Geochronometria

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2007

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Vol. 29

1-21

EN

This article presents results of multidisciplinary research which has been carried out in order to determine changes in the vegetation cover as well as changes in the structure of the Karaśne lake-mire complex in the Late Glacial and Holocene. In addition, human impact on the formation of the vegetation cover and the bio- and chronostratigraphy of the Late Glacial sediments is discussed.

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Późnoplejstoceńska i holoceńska ewolucja torfowiska Durne Bagno (Polesie Lubelskie)

Bałaga K., Dobrowolski R., Rodzik J.

Przegląd Geologiczny

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2006

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Vol. 54, nr 1

68-72

EN

The Durne Bagno peat bog is the eastern, peripheral part of a large marshland complex in the Lublin Polesie. Limnic biogenic deposits occurring directly on mineral deposits are up to 8.5 m thick. They exhibit great vertical facial variability and small lateral differentiation. This indicates that the conditions of sedimentation/sedentation were similar in the whole basin in particular time intervals. The chronostratigraphically-correlated sequence of sediments allows reconstruction of the geosystem evolution in recent 13 ka BP. In its entire Late Glacial and Holocene history two basic stages may be distinguished: lacustrine (OD — middle AT) and mire (middle AT — present time)

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Hydrological changes in the lublin polesie during the late glacial and holocene as reflected in the sequences of lacustrine and mire sediments

Bałaga K.

Studia Quaternaria

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2002

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Vol. 19

37--54

EN

The paleoecological research of biogenic sediments sampled in the different lake-mire ecosystems of the Łęczna-Włodawa Lake District were the basis of studies on hydrological changes during the Late Glacial and Holocene. The lithological differentiation (spatial and temporal) of lacustrine and mire sediments in the studied sites indicates that the hydrological changes were of local nature. The investigations also evidence a specific functioning of the lakes in this region. Lake basins were formed as a result of the ground ice degradation and the transformation of groundwater circulation in the Late Glacial. The total area of lakes in the Lake District was the largest from the Younger Dryas to the Subboreal chronozone. The gradual lowering of water level during the early Holocene resulted in the transformation of sedimentation process, and in the development of typologically differentiated mires and lacustrine-mire complexes.