Abstract
The investigations were carried out in four peat-pits located in the northwestern part of Bubnow Swamp, situated within the Polesie National Park. It is a fen created on chalk ground. The analysis of physicochemical factors of water and qualitative and quantitative analysis of macrophytes of the peat-pits were carried out in the vegetation season in 2008 and 2009. The aim of investigations was to determine the water habitat conditions and composition of plant associations especially charophytes in peat-pits of protected areas. In the investigated peat-pits there was a slight defferentiation of physical and chemical properties of water. The investigated peat-pits are naturally and floristically valuable hydrogenic ecosystems in various stages of succession. The peat-pits are characterized by occurrence of endangered species of charophytes: Chara hispida and Chara intermedia, as well as a protected species such as Nymphaea candida and Chara globularus as vulnerable species.
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