Ábrahám Levente (szerk.): Válogatott tanulmányok V. - Natura Somogyiensis 17. (Kaposvár, 2010)
ERDŐS, L. & MORSCHHAUSER, T.: A déli gyöngyvesszős cserjés (Helleboro odori-Spiraeetum mediae) a Villányi-hegységben
ERDŐS L. & MORSCHHAUSER T.: HELLEBORO ODORI-SPIRAEETUM MEDIAE 13 S+Sr C G NP DT W RC Social behaviour types Fig. 2: Spectra of the social behaviour types based on presence-absence data and on quantitative data with maxima at W3 in the case of frequency and cover data as well. In the case of the soil reaction values, basifrequent (R7) plants are dominating. Considering the relative nutrient values, the most frequent categories are N2, N3 and N4 in the case of presenceabsence data. However, in the case of abundance data, the category N5 is by far the most considerable, because of the great cover values of the Spiraea media , an N5 plant. The peak of the relative light values is at L7 in both cases. The continentality spectra has its maximum at the categories K3 and K4 in the case of the frequency data. In contrast, proportion of K7 values is the greatest if cover values are taken into account; this is due to the dominance of the K7 species Spiraea media. Discussion We analysed the rock-heath association Helleboro odori-Spiraeetum mediae of the Szársomlyó Mt (Villány Mts). We compared this stand to the stands of the Mecsek Mts. Habitat conditions, structural characteristics as well as the spectra of the social behaviour types and of the ecological indicator values are very similar. Therefore, it is unambiguous, that the stands of the two mountains belong to the same association. However, there are certain differences in species composition and the community is much more species rich on the Szársomlyó. There are some species in the Spiraea-stands of the Szársomlyó Mt (e. g. Ajuga genevensis, Anemone ranunculoides, Cystopteris fragilis ) that are lacking from the Mecsek, but are characteristic of the North Hungarian Mountain Range. Another important difference is, that in the Mecsek Mts Helleboro odori-Spiraeetum mediae stands are in contact with the top-forest Aconito anthorae-Fraxinetum orni. In contrast, on the Szársomlyó Mt the two communities are further away.
