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• Felhagyott jószágállások növényzetének vizsgálata a Hortobágyi Nemzeti Parkban

  21-27

  István Hődör

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  62

  Extensive grazing, especially sheep grazing is the most important land use type in alkali grasslands of the Hortobágy National Park. Extensive grazing systems rely on some basic infrastructure, such as sheep corrals, wells and stables. Sheep corrals are characterised by intensive land use: grazing, trampling and manuring is concentrated in these places, thus the vegetation of actively used corrals is markedly different from the vegetation of extensively grazed grasslands. I studied the vegetation composition of eight-year-old and sixty-year-old abandoned sheep corrals and extensively grazed pastures in Hortobágy National Park. I recorded the percentage cover of vascular plants in twenty 2×2-m plots. The cluster analysis showed that the vegetation of abandoned sheep corrals was different from pastures. I found that the cover of annual and biennial species was higher, while the cover of perennials was lower in abandoned sheep corrals compared to the pastures. Due to the intensive land use in the past, the proportion of nitrophilous species was higher in sheep corrals, than in the pastures. The cover of competitors was lower, while the cover of disturbance tolerants, weeds and ruderal competitors was higher in sheep corrals than in the pastures. The results suggest that even grassland regeneration started in the sheep corrals and several target species established in the vegetation, the recovery of grasslands similar to extensively grazed pastures takes longer time.