Pian piccolo, Parco Nazionale dei Monti Sibillini
Phytosociological study of Quercus pubescens s.l. woods of Marche and surrounding areas of the North-Central Apennines (Central Italy). The phytosociological analysis of wood of Quercus pubescens s.l. occurring in the territory of Marche are here presented. The aim of this study was to identify the associations in which these woods participate and the landscape contexts in which they occur. A matrix with 138 phytosociological relevés was constructed. These relevés, both published and unpublished, concerned the territory of Marche and the surroundings areas of the Umbro-Marchigiano and Tosco-Marchigiano Apennines and were previously considered as belonging to the following associations: Peucedano cervariae-Quercetum pubescentis, Cercidi siliquastri-Quercetum pubescentis, Clematido flammulae-Quercetum pubescentis and Roso sempervirentis-Quercetum pubescentis. In the matrix were also inserted relevés made in several sectors of Central Italy to better define the areale of the Roso sempervirentis-Quercetum pubescentis association. These relevés concerned the following subassociations: quercetosum cerridis occurring in the hills of Tuscany; ericetosum multiflorae occurring in some areas of Umbria and carpinetosum orientalis for a sector of southern Latium. The phytosociological analysis of the relevés clustered in the dendrogram and the study of dynamic relationships allowed the attribution of the forest vegetation here considered to three association belonging to the 0stryo-Carpinion orientalis alliance: Peucedano cervariae-Quercetum pubescentis for tlhe aspect relatively most mesophylous, Pistacio terebinthi-Quercetum pubescentis ass. nova for the meso-xerophylous hilly sectors of southern Latium (previously attributed io the carpinetosum orientalis sub-association of the Roso sempervirentis-Quercetum pubescentis association) and, finally, Roso sempervirentis-Quercetum pubescentis for the exclusively xerophytic aspects. The Roso sempervirentis-Quercetum pubescentis association includes the following xerophytic associations: Cercidi siliquastri-Quercetum pubescentis p.p. described for the Pesaro province and Clematido flammulae-Quercetum pubescentis for the hills of Romagna. The group of relevés of the hilly sector of Tuscany were attributed to the Lonicero xylostei-Quercetum cerridis association which was described for the sub-coastal sector of Adriatic side and occurring in the region with the loniceretosum etruscae new subassociation.
Central Italy, forest vegetation, Marche, phytosociology, syntaxonomy