Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 90. (Budapest 1998)

Dobolyi, K.: Phytosociological studies on the andesite rocky grasslands in Visegrád Mountains (Hungary)

Table 10. Distribution of the social behaviour type and naturalness value (NV) on the sites (BORHIDI 1993) (expressed in percentage) Groups of relevés Social behaviour type \\ I. II. III. IV. V. VI. Total Rare specialists 8 0.3 0.1 Specialists 6 11.4 9.3 13.2 16.6 8.9 11.6 1 1.9 Competitors 5 14.6 18.2 13.7 17.3 14.7 20.0 15.4 Generalists 4 27.4 24.6 44.5 35.4 46.0 48.8 35.3 Natural pioneers 3 12.1 19.9 10.4 3.9 6.8 2.8 10.5 Disturbance tolérants 2 26.9 22.8 16.5 22.3 19.1 14.0 21.6 Weeds 1 6.4 2.9 0.6 1.2 0.5 2.4 3.3 Rudcral competitors 2 1.2 2.3 1.1 2.7 4.0 0.4 2.1 Unknown 0.3 0.1 Average naturalness value 3.45 3.49 3.88 3.82 3.62 4.03 3.63 (Table 10). High proportion of weeds in the group I and ruderal competitors in group V indicate degradation on these sites. The cause of degradation is tourism and high game density. The outstanding value of andésite grasslands is expressed by average naturalness value of the groups. The distribution of ecological indicator values and the figures of continentality are characteristic for the environmetal circumstances of andésite rocky grassland: basic and nitrogen-poor soil, extreme dry and warm microclimate (Tables 1 1 to 15). As for the nitrogen figures, there is a small second "peak" at 7 and 8 (Table 14). The cause of this irregular distribution is the appearance of nitrophilous weeds, which also indicates high game density. Table 11. Distribution of the temperature figures on the sites (BORHIDI 1993) (expressed in percentage) Groups of relevés Temperature figures I II Ill IV V VI Tola! 1-3 4 0.6 0.2 0.1 5 20.0 26.3 21.4 16.8 27.8 25.2 22.2 6 31.4 38.7 44.0 38.4 24.7 35.6 33.0 7 32.0 24.3 14.8 29.4 26.4 12.8 27.6 8 15.0 10.7 19.2 14.9 21.2 26.4 17.0 9 0.7 0.2