Change of composition and diversity of species and grassland management between different grazing intensity in Pannonian dry and wet grasslands

摘要

Investigations were carried out in wet and dry pasture. Coenological recordings were taken in three zones. The first zone ("A") located 0-50 m near the stable, second zone ("B") located 50-150 m fro m the stable, while the third zone ("C") located farther than 150 m. We have carried out analyses of ecological and environmental factors and life form types. Based on our results for both dry and wet grasslands, quadrates of "A" zone were well isolated from the rest of the zones. Overgrazing, which involves considerable trampling, vanishes differences among vegetations, thereby promotes weed and disturbance tolerant rich vegetation. The lowest species number and diversity could be found here. Due to the nitrogen enrichment due to the constant presence of livestock, drier and less heat demanding habitat developed in the "A" zones, according to the environmental indicators. Because of the change in management, conservation and diversity values of "C" zone increased, ho wever, according to nature protection values it underperformed compared to "B" zo ne. According to the sample area, wet grasslands fro m the sand y areas of Kiskunság, preserve nature protection values and grass composition better moving away from stables, due to less grazing pressure. Drier backgrounds tolerate stronger grazing pressure.