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ŠUMARSKI LIST 5-6/2014 str. 16     <-- 16 -->        PDF

-Carpinetum orientalis (Table 4). Therefore we propose to classify them within the association Aristolochio luteae-Quercetum pubescentis (Ostryo-Carpinion orientalis, Quercetalia pubescentis)
Ordination analysis (Fig. 3B) as well as similarity and distance indices (Table 4) suggest that studied stands are floristically most similar to stands of the association Aristolochio luteae-Quercetum pubescentis from NW Adriatic. However, Jaccard’s similarity index, which takes into account only presence/absence data, was the highest when comparing studied stands and syntaxon Querco pubescenti-Carpinetum orientalis lauretosum from Istrian Peninsula, suggesting a different synsystematic treatment of studied stands regardless the type of geological bedrock. Nevertheless, the J-index was only marginally higher than values obtained from comparisons with other syntaxa. Based on the results of ordination analysis (Fig. 3B) and other similarity and distance values (Table 4) we find our synsystematic proposal justified. Although only preliminary, not sufficiently exhaustive and based on fairly uneven or low number of relevés per syntaxa, our results of numerical analyses somewhat depart from established syntaxonomic treatments within the alliance Ostryo-Carpinion orientalis (compare Trinajstić 2008; Vukelić 2012). For example: the most distinct and floristically well differentiated stands are those belonging to the continental association Querco pubescenti-Ostryetum carpinifoliae (Fig. 3B – group 1). Those stands lack majority of the (sub-)mediterranean taxa and their syntaxonomic position is not questionable. On the other hand, although the indication of groups of syntaxa in Fig. 3B is debatable, but supported by the results of similarity and distance measures (Table 4), analyses showed major incongruences with current syntaxonomic scheme. Stands of the association Aristolochio luteae-Quercetum pubescentis are positioned in four different groups (Fig. 3B) and intermixed with other syntaxa of the alliance Ostryo-Carpinion orientalis.
The synsystematics of the thermophytic forests on different syntaxonomic ranks were already discussed in several papers (e.g. Trinajstić 1982; Poldini 1988; Čarni et al. 2009; Vukelić 2012). The fact that oriental hornbeam acts as a pioneer species in almost all secondary succession stages of eastern Adriatic thermophytic forests, makes the utility of proposed classification schemes even more difficult (see Horvat 1962). For example: Horvat et al. (1974) treated stands where Quercus pubescens and Carpinus orientalis dominate in a tree layer as a typical ones within the association Querco-Carpinetum orientalis (Table 2, line 1), although the results of our numerical analyses (Fig. 3B – group 2) suggested that they resemble most to stands of the association Aristolochio luteae-Quercetum pubescentis (Table 2,