Based on 301 phytosociological records the 17 plant associations and following classes were destinguished: Phragmitetea (9), Molinio-Arrhenatheretea (6) and Plantaginetea (2). The changes of meadows plant communities in period 1956-1997 were also presented. The results confirmed that the areas were covered by poor plant communities substantially increased. During that time the association Cirsio-Polygonetum and species - Polemonium coeruleum, Molinia coerulea dissappeared. Presently the 170 species vascular flora were found on the area. The new rare specics: Euphorbia palustris, Sonchus paluster and Carex clisticha were appeared.
Mistakes made during meadow management, especially a lack of crop cultivation and reducing of mineral fertilization are the reasons for simplification and often degradation of species composition on meadow sward. It is not only the cause of yield decrease but also sod looseness and as a consequence, soil habitat degradation. Various reseeding techniques are the means for its improvement. In our study carried out on smooth-stalked meadow situated on peat-rot soil, the best results were obtained for objects pre-sown after cultivation in the traditional way, i.e. using rototiller. On the objects that were oversown using special sowing machines (slotted or groove types), good results were obtained after strong weakening the competitiveness of the old sward using Roundup spraying. In high humidity conditions, Reglone spraying or the lack of it caused fast regeneration of Poa pratensis var. angustifolia that made impossible to develop the oversown species.
W pracy przedstawia się wyniki wieloletnich badań fitosocjologicznych (1964-2000), związanych z przemianami zbiorowisk łąkowych w północno-zachodniej Polsce. Szczególną uwagę zwrócono na rolę użytkowania w kształtowaniu łąkowej szaty roślinnej - zagrożeń związanych z antropopresją oraz problemy ochrony czynnej najcenniejszych zbiorowisk łąkowych.
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