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Fitosociologia numero 44 (2)

pag. 15-54: I boschi ad abete rosso ed abete bianco in Friuli (Italia nord-orientale)

L. Poldini1 & E. Bressan2

1Università degli studi di Trieste, Dipartimento di Biologia, Via Giorgieri 10, I-34127 Trieste; e-mail: poldini@units.it

2Università degli studi di Trieste, Dipartimento di Biologia, Via Weiss 2, I-34127 Trieste; e-mail: ebressan@units.it

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abstract

Norway Spruce and European Silver-fir woods in Friuli (NE-Italy). This paper deals with woods dominated by Norway Spruce and European Silver-fir localized in the SE-Alps sector of Friuli region. Phytosociological analyses have been carried out in order to contribute to the knowledge of this woods syntaxonomy. The vegetation study has been performed through 141 phytosociological relevés according to Braun-Blanquet phytosociological method. The matrix, relevés by species, has been analysed by multivariate conventional techniques of classification (cluster analysis) and not-conventional ones (neural network) in order to highlight homogeneous groups. The neural network techniques combined with the sociological-ecological groups method (GSE) allowed to recognize Homogyno sylvestris-Piceetum, Laburno-Piceetum, Rhodothamno-Piceetum e Anemono-Abietetum, on calcareous substrata, and Homogyno alpinae-Piceetum, Luzulo nemorosae-Piceetum, Cardamino pentaphylli-Abietetum e Senecioni cacaliastri-Piceetum, on sandstone. Petasito paradoxi-Piceetum e Rhodothamno-Laricetum units have not been included in syntaxonomical scheme, for the more uncertainties which persist in their sintaxonomic arrangement.

keywords

abies alba woods, friuli (ne-italy), neural network, phytosociology, picea abies woods