B. Papp szerk.: Studia Botanica Hungarica 33. 2002 (Budapest, 2002)

Dobolyi, Konstantin: Studies of vegetation dynamics on the rock grasslands in Csíki-hegyek (Budaörs, Hungary)

Results of statistical analyses The phytogeographical spectrum (areal types) of the four sites is given in Table 6. High natural value of the investigated grassland is proven by the high diversity of floral elements, and the relative high proportion of special floral elements (e.g. sub-Mediterranean, Pontic, Balkan and Sarmatian) and endemic species. The phytogeographical spectrum has changed only in a small extent in the time frame of the study. The most important change is that the proportion of the endemic species had decreased in the past five years. This fact is one sign of degradation. The phytosociological composition of the sites is characteristic for the open dolomite rock grasslands and dolomite slope steppes and it shows only insignificant, small change (Table 7). Since there are no earlier phytosociological data of the studied sites, this change does not provide evidence for conclusive statement. Distribution of the social behaviour type (based on the role the plant species play in the plant communities) is one of the most important basic characteristics of vegetation units. It is particularly suitable to express the natural value of the sites. Remarkable is the extremely high proportion of specialists (Table 8). Change of Table 6. The phytogeographical spectrum of the sites (Ranking according to HORVÁTH et al. (1995) (expressed in percentage). Odvas-hegy Szekrényes-hegy Farkas-hegy Kő-hegy 1996 2001 1996 2001 1996 2001 1996 2001 Alpin-Balkan 1.1 1.4 Atlantic-sub-Mediterranean 2.6 2.1 2.9 6.3 7.9 5.8 8.1 8.4 Balkan 3.1 2.0 Circumpolar 0.3 0.3 0.9 Eurasian 7.1 10.7 2.9 2.8 4.8 5.1 2.2 1.8 European 14.8 8.7 13.5 13.0 11.0 12.0 8.1 4.9 Illyrian, West Balkan 2.4 1.5 1.4 1.3 Carpathian endemic 0.6 0.6 2.1 1.2 0.3 0.5 Continental 4.3 4.9 4.5 3.5 10.0 7.3 13.5 12.9 Central European 5.7 4.9 10.7 10.6 10.3 11.2 9.0 15.1 Central European-Alpin 1.4 1.4 2.1 2.0 3.1 2.9 0.5 0.9 Cosmopolitan 1.1 2.0 0.4 2.1 1.8 3.1 0.4 Pannonian endemic 9.4 8.4 16.4 10.7 2.4 1.8 11.2 9.8 Pannonian-Balkan 0.6 2.9 3.2 0.3 1.8 0.4 Pontic-Pannonian 6.3 5.8 2.5 2.0 7.6 5.8 5.4 3.1 Pontic-sub-Mediterranean 18.5 15.9 13.9 14.2 4.5 9.4 4.0 6.2 Pontic 2.3 2.0 0.4 0.7 0.4 Sarmatian 2.6 3.2 5.3 5.9 7.2 7.3 1.4 1.3 Subatlantic 2.7 3.6 Sub-Mediterranean 18.5 18.7 20.1 18.9 25.2 26.8 27.4 28.4 Turanean (Aralo-Caspian) 7.2 5.5 1.1 0.4