101,974 research outputs found
La vegetazione forestale del “Bosco di Oricola”, un querco-carpineto nell’Appennino laziale-abruzzese.
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Terrazzamenti abbandonati e recupero della vegetazione spontanea: il caso dei Monti Aurunci.
No full textFirst record of the steppic relict Astragalus exscapus L. subsp. exscapus in the Apennines (Abruzzo, Italy), and biogeographic implications
No full textAstragalus exscapus L. subsp. exscapus (Fabaceae) is a rare and declining perennial herb with a very fragmented distribution range. It is interpreted as a relict of the glacial steppe flora. In Italy, it was known until now only from the Alpine “dry valleys”, namely from Val d’Aosta and Val Venosta/Vinschgau. We report on the discovery of a population on the slopes of the Fucino basin in the Central Apennines (Abruzzo, Italy). The finding significantly expands the known species range (the site is >600 km away from the nearest known populations), suggesting that during Pleistocene steppic phases it had a wide distribution across Europe. A. exscapus adds to a number of other steppic relicts found in the Fucino basin, highlighting that some inner valleys of the Central Apennines, featuring a relatively continental climate, perform as “interglacial refugia” for the steppe flora. Further research is needed to ascertain the species’ local distribution and abundance, and to clarify its vicariance history; however, the finding underlines the need to re-evaluate priorities in landscape management, as in the Apennines dry grasslands are often given low values compared to forests and are frequently destroyed by afforestation practices with non-native conifers
Classification of Southern Italy Ostrya carpinifolia woods.
No full textClassificazione dei boschi di Ostrya carpinifolia nell’Italia meridionale. Le cenosi forestali ad Ostrya carpinifolia localizzate nell’Appennino meridionale non sono state finora oggetto di specifici studi fitosociologici, a differenze di quelle dell’Appennino centro-settentrionale. Nell’ambito del presente lavoro sono state rilevate comunità a carpino nero nella Campania meridionale; i rilievi originali sono stati comparati con tutti i dati disponibili in letteratura per gli ostrieti dell’Italia meridionale. Le associazioni fino ad ora descritte sono state revisionate sulla base della composizione floristica e delle caratteristiche bioclimatiche. Un contingente di specie di rilevante significato biogeografico differenzia queste comunità dagli ostrieti dell’Italia centrale: pertanto, si propone qui una nuova suballeanza Festuco exaltatae-Ostryenion carpinifoliae all’interno del Carpinion orientalis. Il nuovo syntaxon descrive gli ostrieti e i boschi misti con Ostrya degli orizzonti mesotemperato oceanico e supratemperato oceanico del settore tirrenico dell’Italia meridionale, oltre ad alcune formazioni extrazonali presenti nella regione bioclimatica mediterranea per compensazione edafica o topografica. All’interno di questo syntaxon vengono riconosciute due associazioni: Festuco exaltatae-Aceretum neapolitani e Seslerio autumnalis-Aceretum obtusati. Nell’ambito di quest’ultima associazione viene inoltre descritta una nuova subassociazione (galietosum laevigati) per gli ostrieti più mesofili e i boschi misti con Ostrya del Cilento.
I boschi del Carpinion orientalis dell’Italia peninsulare risultano dunque suddivisi così in cinque suballeanze: Laburno-Ostryenion, Lauro-Quercenion pubescentis, Cytiso sessilifolii-Quercenion pubescentis, Campanulo mediae-Ostryenion, Festuco exaltatae-Ostryenion
Serie di vegetazione della Regione Basilicata. In: Blasi C. Eds., Completamento delle Conoscenze Naturalistiche di base, Carta delle Serie di vegetazione d'Italia, scala 1:250.000, GIS Natura.
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In and out: Effects of shoot- vs. rooted-presence sampling methods on plant diversity measures in mountain grasslands
No full textPlant diversity measures (e.g., alpha- and beta-diversity) provide the basis for a number of ecological indication and monitoring methods. These measures are based on species counts in sampling units (plots or quadrats). However, there are two alternative conventions for defining a vascular plant species as “present” in a plot, i.e. “shoot presence” (a species is recorded if the vertical projection of any above-ground part falls within the plot) and “rooted presence” (a species is recorded only when an individual is rooted inside the plot). Very few studies addressed the effects of the two sampling conventions on species richness and diversity indices. We sampled mountain dry grasslands in Italy across different plot sizes and vegetation types to assess how large is the difference in alpha- and beta-diversity values and in sample-based rarefaction curves between the two methods. We found that the difference is greatly dependent on plot size, being more relevant, both in absolute and percentage values, at smaller grain; it is also dependent on habitat type, being larger in shallow-soil communities, as they have a sparser vegetation structure and host life-form types with a larger lateral spread. At fine spatial scales (<1 m2) the difference is large enough to bias statistical inference, and we conclude that at such scales one should not attempt to compare plant diversity indices if they were not obtained with the same sampling convention
The map of the vegetation series of Italy.
No full textWe present the methodology developed for mapping the vegetation series of Italy (at scale 1:250.000) in the frame of the project "Completion of Basic Naturalistic Knowledge", funded by the Italian Ministry of the Environment. A hierarchical land classification is combined with expert knowledge of vegetation dynamics and phytosociological field data. The Map of the Vegetation Series is an essential tool for ecological planning and land management
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