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Fitosociologia numero 42 (2)

pag. 83-103: Le praterie a Stipa austroitalica Martinovsky ssp. austroitalica dell’Alta Murgia (Puglia) e della Murgia Materana (Basilicata)

L. Forte1, E.V. Perrino2 & M. Terzi3

1Dip. Scienze delle Produzioni Vegetali, Museo Orto Botanico, Università degli Studi di Bari, Via E. Orabona 4, I-70126 Bari; e-mail: forte@botanica.uniba.it

2Dip. di Botanica, Università di Catania, Via A. Longo 19, I-95125 Catania

3Istituto di Genetica Vegetale – CNR, via Amendola 165/A, I-70126 Bari; e-mail: massimo.terzi@igv.cnr.it

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abstract

Stipa austroitalica Martinovsky ssp. austroitalica grasslands of Alta Murgia (Apulia) and Murgia Materana (Basilicata). This paper deals with grasslands dominated by Stipa austroitalica ssp. austroitalica in the districts of National Park of Alta Murgia (central Apulia) and Regional Park of Murge Materane (south-east of Basilicata). Phytosociological analyses have been carried out in order to contribute to knowledge of these grasslands syntaxonomy. The phytoclimatic outline of the area under study has been obtained by processing the thermal and rainfall data recorded at the weatherstations of Altamura, Castel del Monte (Alta Murgia) and Matera (Murge Materane) and computing bioclimatic indexes (according to the methods of Rivas Martinez and of Montero de Burgos and González Rebollar). The vegetation study has been performed through 31 phytosociological relevés. The matrix, relevés by species, has been analysed by classification and ordination multivariate techniques in order to highlight homogeneous groups. The phytoclimate of the area can be ascribed to the pluvioseasonal-oceanic type of the Mediterranean macrobioclimate, with a mesomediterranean thermotype and a continental tendency. Murge Materane phytoclimate results more thermo-xeric than Alta Murgia one. Phytosociological and statistical multivariate analyses have pointed out two main groups of relevés corresponding to two new associations: Acino suaveolentis-Stipetum austroitalicae e Chamaecytiso spinescentis-Stipetum austroitalicae. These latter have been framed in a new alliance (Hippocrepido glaucae-Stipion austroitalicae) of Scorzonero-Chrysopogonetalia, that gathers calcareous steppe grasslands of Festuco-Brometea, with accentuated Mediterranean characters. The
results of this study show the affinity between S. austroitalica ssp. austroitalica grasslands of south-east of Italy and vegetation of trans-Adriatic and north-Adriatic Carso areas. Moreover, they contribute to define the westward part of Scorzonero-Chrysopogonetalia range, which thus would include also the inner part of central Apulia and eastern Basilicata.

keywords

Alta Murgia, Murgia Materana, phytosociology, Scorzonero-Chrysopogonetalia, S-E Italy, Stipa austroitalica, syntaxonomy