In the years 1993 and 1994 were carried out geomagnetic researches on the selected plant communities of grassland near Krakow. The authors have received first of all the quantities data (nT) and graphic characteristics in selected places. Then were made phitosociological researches of the sward and graphic registration of plant cover by dominant plant species. It was found that on the experimental fields there were four types of plant associations. On the geomagnetic- fields in homogenous (with (he big anomalies) in the limits to 10000 nT there were always some dominant plants. Whereas on the homogenous fields, where the geomagnetic tensions was too higher (dozens thousants) nT there was only one dominant plant.
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