1,721,051 research outputs found
Inquadramento fitosociologico delle comunità vegetali nelle aree umide residuali del litorale nord della provincia di Roma
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
L’archeologia industriale nel suo rapporto con l’ambiente. Riflessioni sulle connessioni fra attività e caratteristiche dei luoghi.
No full text
Pattern of floristic variation on a montane beech forest in the central Apennine (central Italy)
No full textClimate, history and human land use have a strong influence on the distribution and floristic composition of beech forest communities. In the last
50 years, the decrease in human activities has led to the resumption of reforestation dynamics, so a certain variability in floristic composition is
expected. We aim to identify the causes of local floristic variability in different stands of beech forests, integrating floristic, structural and ecological
analysis.
Cluster analysis and Indicator Species Analysis (ISA) were performed to highlight floristic differences; the clusters obtained were compared through
environmental and topographic variables, Ellenberg indicator values, life forms, Social Behaviour Types (SBT) and structural parameters. The
species heterogeneity derives from a climatic and edaphic gradient. Two main types of beech forests were recognized: a microthermal one, placed
at higher altitudes and cooler aspects (Cardamino kitaibelii - Fagetum sylvaticae), and the termophilous one, lying at lower altitudes and warmer
aspects (Lathyro veneti - Fagetum sylvaticae). SBT and structural parameters were useful for detecting the effects of dynamic processes of reforestation.
The integration of the floristic, structural and ecological analysis led to an accurate coenological overview of the beech forest communities
and to the detection of the natural reforestation processes currently ongoing
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