Walory przyrodnicze zbiorowisk łąkowych doliny rzeki Mierzawy

The aim of the research was to evaluate the meadow communities, that are accompanying the valley of Mierzawa river. The types of habitats that have been examined are the fresh and the wet meadows, that belong to various phytosociological associations, differentiated in the type of management. In explored terrain, there has been done 45 phytosociological records, during June and July in 2010 and 2011, in 16 localities, that all belong to the Niecka Nidziańska macroregion. The Mierzawa river is a right-bank tributary of Nida, and its length is about 60 km. Altitudes above sea level in the investigated area only slightly exceed 200 m in the valley of this river. Whereas altitudes of surrounding ground reach to a little above 300 m a.s.l. In this area, there is a considerable floristic diversity, what has been assessed by a big number of plant species, genera, and botanical families, that belong to vascular plants. Natural values of that terrain were estimated according to an appropriate method, which shows that the wet meadows are more floristically diversified than the fresh meadows.