Biogeographical regionalization should not be confused with ecological cartography or landscape classification, as biogeographical classification should be based only on species distribution. Therefore, the optimal data set for a phytogeographical (floristic) classification of Italy would be a floristic atlas including all the vascular plants species of the country: grid cells should be treated as OGUs (Operational Geographic Unit) and elaborated through multivariate presence/absence analysis. However, such an atlas has never been realized in our country. Aim of the paper is to present a quantitative phytogeographical classification of Italy based on available data, i.e. the new check-list of the Italian vascular flora, the large amount of published local floras and information about the distribution of Potential Natural Vegetation (vegetation series). As the check-list shows the plant list of each of the 20 administrative regions of Italy, these can be treated as OGUs for a first, coarse-grain framework classification of the country. A more detailed and fine-grained analysis of Italy’s phytogeographical units can be made analyzing a wide set of local floras, chosen – among the many available – on the basis of their study area surface and ecological heterogeneity. We also present a detailed analysis regarding the chorological attributes of species exclusive of the Thyrrenic regions compared to the Adriatic ones. The complex of the analysis confirm the presence of a gradient north-south and a clear separation est-west along the Peninsula. Results confirm that the adopted method is a valuable approach and propose a new boundary for the Centre- European Region in Southern Italy.

Primi risultati per una nuova regionalizzazione fitogeografica del territorio italiano

ROSATI, LEONARDO;
2007

Abstract

Biogeographical regionalization should not be confused with ecological cartography or landscape classification, as biogeographical classification should be based only on species distribution. Therefore, the optimal data set for a phytogeographical (floristic) classification of Italy would be a floristic atlas including all the vascular plants species of the country: grid cells should be treated as OGUs (Operational Geographic Unit) and elaborated through multivariate presence/absence analysis. However, such an atlas has never been realized in our country. Aim of the paper is to present a quantitative phytogeographical classification of Italy based on available data, i.e. the new check-list of the Italian vascular flora, the large amount of published local floras and information about the distribution of Potential Natural Vegetation (vegetation series). As the check-list shows the plant list of each of the 20 administrative regions of Italy, these can be treated as OGUs for a first, coarse-grain framework classification of the country. A more detailed and fine-grained analysis of Italy’s phytogeographical units can be made analyzing a wide set of local floras, chosen – among the many available – on the basis of their study area surface and ecological heterogeneity. We also present a detailed analysis regarding the chorological attributes of species exclusive of the Thyrrenic regions compared to the Adriatic ones. The complex of the analysis confirm the presence of a gradient north-south and a clear separation est-west along the Peninsula. Results confirm that the adopted method is a valuable approach and propose a new boundary for the Centre- European Region in Southern Italy.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/18942
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