1,721,022 research outputs found
I prati a Molinia caerulea (L.) Moench della Pianura Padana: sintassonomia, sincorologia, sinecologia.
No full textColonizzazione delle aree postglaciali del ghiacciaio del Lys (Valle d'Aosta) liberate dopo la piccola glaciazione.
No full textSecondary succesions due to agricoltural dereliction and post-fire recovery in the mediterranean vegetation: first outlines in western Elba (North Tyrrhenian Sea - Italy).
No full textLa vegetazione forestale dell’ordine Piceetalia excelsae Pawl. in Pawl. et al. 1928 nelle Alpi Lombarde.
No full textIn Lombardy, boreal-like conifer forests are widespread on the whole alpine chain, particularly in the central Raethian Alps with continental climate and, on a lesser extent, in the Lepontine Alps with oceanic climate and in the peripheral chains with intermediate climatic traits (Orobian Alps, Camonica Valley, Pre-Alps). The average yearly rainfall can exceed 2000 mm in the Lepontine Alps, while it falls below 1000 mm in the inner Rhaetian Alps. The bedrock consists mainly in siliceous rocks.
In the present work, the main forest communities have been outlined on the basis of 253 relevés, analysed by multivariate analyses and by the comparison with the main syntaxonomic schemes found in literature. The described communities can be related to the main biogeographical and ecological domains of Lombardy. Communities belonging to Piceetalia excelsae Pawl. in Pawl. et al. 1928 can be observed on acidic, oligotrophic soils. The alliance Piceion excelsae Pawl. in Pawl. et al. 1928 is divided into two suballiances: the first (Vaccinio-Piceenion Oberd. 1957) includes the subalpine forests of the continental inner Alps; the second (Vaccinio-Abietenion Oberd. 1962) the upper montane and subalpine forests belonging to the oceanic domains (e.g. Lepontine and Orobian Alps)
Le fitocenosi a Fagus sylvatica L. dell'alto Lario occidentale: caratterizzazione e significato fitogeografico (nota preliminare).
No full textVegetation and environrnental factors during primary succession on glacier forelands: some outlines from the Italian Alps.
No full textRelationships between plant communities and the physical environment during primary succession on recently deglaciated glacier forelands were studied in 3 areas of the Italian Alps. The aim of the research was to relate traditional phytosociological data with environmental variables. Twenty-eight phytosociological relevds were performed, each associated with twenty-six environmental variables; quantitative parameters of richness and diversity were also calculated. Species/relev6s, environmental variables/relev& and species/environmental variables matrices were analyzed by cluster analysis, PCA and Spearman correlation coefficient. Three main stages of succession were identified by floristic composition and confirmed by environmental parameter evaluation. A complex of environmental variables seems to be closely correlated with terrain age and richness/diversity parameters, even though diversity decreases in late successional stages. The phytosociological significance of species is in accordance with their position in the context of succession
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