The vegetation of alpine belt karst-tectonic basins in the central Apennines (Italy)

The vegetation communities of the karst-tectonic basins of the Majella massif alpine belt were studied using the phyto sociological methods, and analysed from coenological, synchorological and syntaxonomical viewpoints. During the field-work, 115 releves were performed using the phytosociological approach of Braun-Blanquet, and these releves were further subjected to multivariate analyses. Eight clusters of releves resulted from the numerical classification. The plant communities identified in the study area were ascribed to the following five associations, two sub-associations and one community type: Leontopodio - Seslerietum juncifoliae (ass. nova); Helianthemo - Festucetum italicae (ass. nova); Gnaphalio - Plantaginetum atratae; Taraxaco-Trifolietum thalii gnaphalietosum magellensis (subass. nova),- Luzulo italicae-Nardetum, Carici - Salicetum retusae; Saxifrago - Papaveretum julici, Saxifrago - Papaveretum androsacetosum (subass. nova), Plantago atrata and Leontodon montanus community. The distribution of these communities within the karst basins was found to be related to variations in topographic and geomorphological parameters, such as altitude, slope, soil availability and stoniness. All the new associations proposed in this paper belong to the suballiance Leontopodio-Elynenion and to the alliance Seslerion apenninae, both of which are endemic to the central Apennines. In order to compare the plant community types identified within the Majella massif to similar associations found in the rest of the Apennine chain, synoptic tables were constructed. Finally, a comparative phytogeographical analysis of the alpine belt vegetation of the Apennines, Dinarides, southern Balkans and eastern Alps is presented.