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)
Table 7. Distribution of phytosociological character on the sites (BORHIDI 1993) (expressed in percentage). Odvas-hegy Szekrényes-hegy Farkas-hegy Kő-hegy 1996 2001 1996 2001 1996 2001 1996 2001 Secalietea 0.3 Onopordetalia 0.9 0.3 0.4 Sedo-Scleranthetea 1.7 0.9 2.5 1.6 1.0 1.1 Sedo-Scleranthetalia 7.2 5.5 1.1 0.4 Alysso-Sedion 1.2 Festuco-Brometea 36.9 32.6 23.4 26.4 24.1 27.5 21.1 16.0 Festucetalia valesiaceae 24.7 24.8 20.1 23.2 37.6 42.4 38.1 43.6 Festucion valesiaceae 3.7 3.1 (incl. Festucion rupicolae) Asplenio-Festucion 4.3 4.3 5.3 6.9 6.9 4.5 6.7 pallentis Bromo-Festucion pallentis 15.6 15.6 32.8 24.0 19.3 13.8 26.0 21.8 Festucetalia vaginatae 6.8 6.3 7.4 7.1 2.4 1.5 0.4 Festucion vaginatae 1.4 0.9 6.2 3.2 7.9 5.4 9.0 10.2 Quercetalia pubescentis0.5 0.4 petraeae Indifferent 4.0 3.8 2.5 1.6 0.7 0.4 0.9 0.4 the distribution indicates the degradation of the investigated sites very sensitively: proportion of the specialists has decreased in all of the four sites. Since every social behaviour type has a naturalness value (BORHIDI 1993), value of the sites can be quantified by the average naturalness value. Figure 1 indicates that average naturalness value has decreased on all investigated sites. This is an exact evidence of degradation. Table 8. Distribution of the social behaviour type on the sites (Borhidi 1993) (expressed in percentage) (NV = naturalness value). Odvas-hegy Szekrényes-hegy Farkas-hegy Kő-hegy Social behaviour type NV 1996 2001 1996 2001 1996 2001 1996 2001 Unique specialists 10 3.1 3.2 2.7 2.2 Specialists 6 22.2 21.3 44.3 33.1 31.7 24.6 35.4 35.1 Competitors 5 11.4 13.0 6.2 5.5 14.8 14.5 20.2 20.9 Generali sts 4 53.4 46.7 44.3 51.2 51.7 56.9 40.8 40.9 Natural pioneers 3 4.0 8.9 2.9 8.3 1.0 2.2 0.4 Disturbance tolérants 2 5.1 5.5 2.5 1.6 0.7 1.8 0.9 0.4 Weeds 1 0.9 1.4 — 0.4 — Change of average -O.10 -0.28 -0.18 -O.03 naturalness value
