B. Papp szerk.: Studia Botanica Hungarica 36. 2005 (Budapest, 2005)

Dobolyi, Konstantin: Phytosociological evaluation and multivariate analysis of the habitat of Linum dolomiticum Borbás (Linaceae) II.

The relevés were analysed by the following multivariate methods with SYN-TAX 2000 program packages (PODANI 2001). 1) hierarchical classifications - distance optimising procedure: group average (UPGMA) - global optimisation 2) ordinations - centred principal component analysis (PCA) - principal coordinate analysis (metric multidimensional scaling; PCoA) The applied distance coefficients are Euclidean distance, Bray-Curtis-index and similarity ratio (PODANI 1997). The classifications and ordinations resulted in six groups of separated relevés. These groups and the mentioned five plant communities were submitted to multivariate analyses again in order to determine the distances between the groups and the communities. The groups of relevés were analysed statistically on the basis of the following species characteristics: life form, phytogeographical area (floral element) (HORVÁTH et al. 1995), phytosociological character, social behaviour type and ecological indicator values (preference categories) (BORHIDI 1993). The values of features characterising the groups of relevés were calculated according to percentage pro rata of plant mass, that is, the sum of the transformed cover values concerning one feature has been expressed in percentage of sum of all cover values of all species. RESULTS The results of multivariate analyses showed that six relatively homogeneous groups of relevés may be separated (78 relevés altogether). The groups are characterised with the floristical composition and dominant species, distribution of life forms, phytogeographical and phytosociological spectrum, social behaviour type of the species and environmental and ecological circumstances. Results of the statistical analyses of the groups are in Tables 9 to 17. The groups represent the characteristic vegetation types of Linum dolomiticum habitats. Some of them can be identified as belonging to the dolomite grassland communities. Group I Relevés: 1-14, 60, 63, 102, 136. Characteristics of the group: - typical exposure: N, NW, W (Table 8), - low proportion of the total cover of vegetation, - relatively low number of species, - dominant species: Festucapollens, Helianthemum canum, Thymus praecox, - highest proportion (22.7%) of Chamaephyta (Table 9), - highest proportion of Submediterranean and endemic species (Table 10), - phytosociological composition is similar to group II (Table 11), Studia bat. hung. 36, 2005