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Fitosociologia numero 41 (2)

pag. 3-20: La vegetazione dei ghiaioni del settore Sud-orientale del Parco Nazionale d’Abruzzo, Lazio e Molise

R. Di Pietro1, S. Proietti1, P. Fortini2 & C. Blasi1

1 Dip. di Biologia vegetale, Università degli Studi “La Sapienza”, Piazzale Aldo Moro 5, I-00185 Roma; e-mail: romeo.dipietro@uniroma1.it
2 Dip. di Scienze e Tecnologie dell’Ambiente e del Territorio, Università degli Studi del Molise, Via Mazzini 8, I-86170 Isernia

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abstract

Scree vegetation of the south-eastern zones of Abruzzo, Lazio and Molise National Park. This paper is a contribute to the coenological and sintaxonomical knowledge of Abruzzo National Park scree vegetation. The study area coincides with the limestone mountainous chains of Serra Rocca Chiarano and Serra Le Gravare which are located in the eastern zone of the National Park. The vegetation has been investigated through the Braun-Blanquet phytosociological approach. The vegetational data have arranged in a binary matrix and further treated with multivariate analysis procedures. Different micro-geomorphological sectors and consequently different ecological conditions can be distinguished into the “scree” system. Each microgeomorphological sector is characterized by a particular interaction of physical parameters such as altitude, aspect, slope, clasts stability and dimension.
The location of the various plant community type along the talus slope seems to be related to different gradients of stability which work both horizontally and vertically. As a consequence it has been possible to define three dimension ecological diagram in which the entire coenological variability of the investigated environment can be represented. As far as phytosociology is concerned, the following communities have been identified: Cymbalarietum pallidae, Galio magellensis-Festucetum dimorphae, (for which the new sub-association gentianetosum luteae is here proposed) Drypido-Festucetum dimorphae and a new Seslerion apenninae community type named Helictotricho-Stachydetum which is typical of the contact area between the scree base and the plain.

keywords

chorology, ICPN, phytosociology, screes, syntaxonomy.