Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 89. (Budapest 1997)

Dobolyi, K.: Phytosociological studies on the rocky grasslands in Csíki-hegyek (Budaörs, Hungary)

METHODS Sampling was carried out so that the visibly undisturbed open rocky grasslands were represented. The relevés were taken from 2 x 2 m quadrates according to BRAUN-BLANQUET (1964). The place of the relevés has been marked on the ground, thus, in the future it will be possible to take the same relevés and to follow up the temporal changes of the vegetation. Cover is expressed in values transformed by VAN DER MAAREL (1979) on a scale of 1 to 9. The scientific names of the species were taken from HORVÁTH et al. (1995). The sample groups of the four investigated sites were analysed statistically on the basis of the following characteristics of their species: phytogeographical area (floral element) (SIMON 1992), phytosociological character, social behaviour type, degree of naturalness and ecological indicator values (BORHIDI 1993). The values of features characterizing the sites were calculated according to DOBOLYI (1992). In the case of phytogeographical spectrum (Table 6) the sum of percentage values exceed 100%, because one species may belong to several phytogeographical area categories. RESULTS AND DISCUSSION The relevés contain 77 vascular plant species altogether (Table 1). Protected species of the sites are the following: Odvas-hegy: Astragalus vesicarius ssp. albidus, Centaurea sadlerana, Draba lasiocarpa, Hypericum elegáns, Iris pumila, Jovibarba hirta, Jurinea mollis, Onosma visiani, Seseli leucospermum, Stipa eriocaulis, Vincetoxicum pannonicum. Szekrényes-hegy: Allium moschatum, Astragalus vesicarius ssp. albidus, Draba lasiocarpa, Jovibarba hirta, Onosma visiani, Paronychia cephalotes, Seseli leucospermum, Stipa eriocaulis, Thalictrum minus ssp. pseudominus. Farkas-hegy: Allium moschatum, Coronilla coronata, Dianthus plumarius ssp. regis-stephani, Draba lasiocarpa, Jovibarba hirta, Jurinea mollis, Paronychia cephalotes, Stipa eriocaulis Kő-hegy: Centaurea sadlerana, Dianthus plumarius ssp. regis-stephani, Draba lasiocarpa, Jovibarba hirta, Jurinea mollis, Seseli leucospermum, Stipa eriocaulis, Vincetoxicum pannonicum The average total cover of the relevés is 50.3% (Table 2). In the distribution of the phytogeographical spectrum it is remarkable that the investigated grasslands are very rich in Pannonian and Pannonian endemic elements. The proportion of Mediterranean, Submediterranean, Pontic and Balkanean species is also relatively high (Table 3). According to the floral and phytosociological composition the associations of the investigated sites belong to the Bromo-Festucion pallentis association group (ZÓLYOMI 1966). Dry grassland elements (Festuco-Brometea) and members of rocky grasslands (Festucetalia valesiaceae) are predominating (Table 4). The distribution of social behaviour types shows that the most valuable species that is specialists, competitors and generalists are dominant in the investigated grasslands (Table 5). The average naturalness values of the sites are the following: Odvas-hegy: 4.55, Szekrényes-hegy: 4.84, Farkas-hegy: 4.82, Kő-hegy: 4.99.