Vegetation changes on the hydrogenic habitats
Surveys of ground layer vegetation are reliable tool for spatial and temporal variation monitoring of forest environment. Vegetation dynamics of forest wetlands communities were studied by re-sampling of phytosociological records in the 1960`s-1970`s in the Bialowieza Forest. The study concerned the following forest plant communities: Ledo-Sphagnetum magellanici, Sphagno-Betuletum pubescentis, Thelypterido – Betuletum pubescentis, Sphagno girgensohnii-Piceetum, Ribeso nigri-Alnetum, Circaeo-Alnetum, those occurred in Białowieża National Park`s strict reserve (BNP) and nature reserves: Wysokie Bagno, Michnówka, Głęboki Kąt.
The Ledo-Sphagnetum magellanici and Sphagno-girgensohnii-Piceetum community had the same sample plots where a breast high diameter of tree species and number of brush and tree species with high shorter than 1.3 m were measured. The ordination methods (DCA) made the model of vegetation changes according to main environmental gradients possible.
It is demonstrated that with the ecological indicator value every site hase a lower value of moisture soil indicator than it was in the past besides Circaeo-Alnetum. The soil fertility did not increase only in Ribeso nigri-Alnetum and Circaeo-Alnetum habitat.
The broadleaves species share, especially birch and alder, increased in Ledo-Sphagnetum magellanici and Sphagno girgensohnii-Piceetum association. The obtained results indicate changes in water conditions and in fertility of hydrogenic habitats, although those changes were not occurred in every community in the same level.
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