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Dobolyi, Konstantin Z.: Vegetation studies on the rocky grasslands of Hór Valley (Bükk Mountains, Hungary)

rocky grasslands require mildly basic, dry and poor in nitrogen soil and mean warm microclimate. The presence of N4 elements is a sign of degradation, as well (Fig. 4). REFERENCES BRAUN-BLANQUET, J. (1964): Pflanzensoziologie. - Wien - New York, 865 pp. MAAREL, E. van der (1979): Transformation of cover-abundance values in phytosociology and its effects on community similarity. - Vegetatio 39(2): 97-114. PODANI, J. (1988): SYN-TAX III. User's Manual. -Abstracta Botanica 12:1-183. PRISZTER, SZ. (1985): Synopsis systematico-geobotanica florae vegetationisque Hungáriáé VII. - Akadémiai Kiadó, Budapest, 683 pp. SIMON, T. (1988): Nature conservation ranks of the Hungarian vascular flora. Abstracta Botanica 12: 1-23. SOÓ, R. (1964-80): Synopsis systematico-geobotanica florae vegetationisque Hungáriáé I-VI. - Akadémiai Kiadó, Budapest, (1964): 519 pp., (1966): 655 pp., (1968): 506 pp., (1970): 614 pp., (1973): 723 pp., (1980): 556 pp. Author's address: DOBOLYI, Z. K. Botanical Department of the Hungarian Natural History Museum H-1476 Budapest, Pf.: 222 HUNGARY