Hexane and methanol leaf extracts of sixteen Mediterranean plant species were obtained by percolation. Higher yields were observed for methanol (16.4–47.8%) than for hexane extracts (1.3–13%). Antioxidant activity of these extracts was determined by a rapid spectrophotometric method involving the combined oxidation of beta‐carotene and linoleic acid. Leaf extracts were thus characterized by an Antioxidant Activity Coefficient (AAC) ranging from 0 to 1000. Hexane extracts gave much higher AAC values than the corresponding methanol extracts. In both cases, myrtle (Myrtus communis) showed the best antioxidant effectiveness.
Les auteurs, après avoir situé le Niolu dans son cadre géographique, décrivent les séries de végétation en mettant en évidence les particularités de cette région vis-à-vis du reste de la Corse. Ces séries correspondent aux étages méditerranéen, supraméditerranéen, montagnard, subalpin / oroméditerranéen et alpin. Un certain nombre de remarques sont faites sur les relations entre la végétation d’une part, le substrat, le climat et l’impact humain d’autre part.
Pinus nigra subsp. salzmannii is a sub mediterranean conifer characteristic of the cold, continental mediterranean mountains. It grows mainly on carbonate sedimentary rocks (dolomite and limestone) and represents the dominant overstorey species at the Supra mediterranean altitudinal zone, where two climatic climax communities are described: Lon ic e ro xy los te i-Pin etu m sal zm anni i and Th al i ct ro tu b eros i-Pin e tum s a I z man n i i. In the southernmost mountains of the Iberian peninsula Pinus nigra subsp. salzmannii also forms open forests with climax value at the Oro-mediterranean alti tudinal zone, at the timber-line. Pinus nigra subsp. salzmannii also defines several edapho climax communities in rocky and steep slopes of the Supra-mediterranean altitudinal zone and, as a result of human disturbance, secondary communities in the Meso-mediterranean altitudinal zone.
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