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Fitosociologia numero 41 (1)

pag. 53-65: A phytosociological study of the deciduous oak woods of Sardinia (Italy)

G. Bacchetta1, E. Biondi2, E. Farris3, R. Filigheddu3 & L. Mossa1

1Università degli Studi di Cagliari, Dipartimento di Scienze Botaniche, viale Sant’Ignazio da Laconi 13, I-09123 Cagliari; e-mail: bacchet@unica.it; mossa@unica.it

2Università Politecnica delle Marche, Dipartimento di Scienze Ambientali e delle Produzioni Vegetali, via Brecce Bianche, I-60131 Ancona; e-mail: e.biondi@univpm.it

3Università degli Studi di Sassari, Dipartimento di Botanica ed Ecologia vegetale, via Muroni 25, I-07100 Sassari; email: emfa@uniss.it; filighed@uniss.it

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abstract

We present here the results from a phytosociological and synchorological study of the deciduous oak woods of Sardinia. This vegetation analysis has allowed the individuation of three new associations: Lonicero implexae-Quercetum virgilianae, Ornithogalo pyrenaici-Quercetum ichnusae and Glechomo sardoae-Quercetum congestae. The Lonicero implexae-Quercetum virgilianae association includes the woods on calcareous substrata spread throughout Northern Sardinia, which can occasionally be found in southern areas; the first of these are rich in mesophilous species and are attributed to the subassociation cyclaminetosum repandi, while the others are referred to quercetosum virgilianae. The Ornithogalo pyrenaici-Quercetum ichnusae association, more widely distributed in Central-Northern Sardinia, includes the climatophilous deciduous woods that are found on lithological substrata of a non-carbonatic nature, and in particular, on andesites, trachytes and metarenites. The typical aspect is referred to the subassociation cytisetosum villosi, while the subassociation ilicetosum aquifoliiGlechomo sardoae-Quercetum congestae association always includes the woods found on the non-carbonatic substrata in the higher altitude areas with an oceanic pluviseasonal temperate bioclimate. Of this, the subassociation quercetosum congestae, on the granite areas, and oenanthetosum pimpinelloidis, on those metamorphic and of basalt, are proposed. At the higher hierarchical levels, the association Lonicero implexae-Quercetum virgilianae is referred to the endemic Sardinian-Corsican suballiance Clematido cirrhosae-Quercenion ilicis, of the alliance Fraxino orni-Quercion ilicis, while for the other associations the new suballiance Paeonio morisii-Quercenion ichnusae, (holotypus: Glechoma sardoae-Quercetum congestae ass. nova) particular to the Sardinian biogeographic subprovince, is proposed, of the alliance Pino calabricae-Quercion congestae, the order Quercetalia pubescenti-petraeae, and the class Querco roboris-Fagetea sylvaticae.

keywords

deciduous oak woods, Paeonio morisii-Quercenion ichnusae, phytosociology, Quercetea ilicis, Querco roboris-Fagetea sylvaticae, Sardinia, synchorology, syntaxonomy