[automatically translated] The basin of the Garda was colonized by humans since Neolithic times. A floristic study carried out between '92 and '94 on the Brescia side of a range between 0 and 100 m above sea level, has allowed us to highlight relationships between human activity and the distribution of quotas in certain floristic 'aforementioned area. The most obvious human interventions were as follows: * Drainage, drainage of wetlands, or weeding. Replacement with irrigated crops or bathing equipment. * Delete-tion of forests attributable to the order of Populetalia albae by alluvial fans and the moraine banks subpianeggianti south of the basin. Replacement with rich meadows hay (Arrhenatheretalia), irrigated crops, camping, housing. * Elimination of part of the populations of Quercus ilex. Replacement by olive groves and lemon trees. The steepest situations were terraced or pasture (Mesobromion). * Elimination or coppicing of mixed forests dominated by Quercus pubescens, Ostrya carpinifolia and Fraxinus ornus. Replacement with vineyards, olive groves, Laureti, pastures and human settlements. Coppicing has substantially changed the physiognomy of the forests, favoring the Ostrya and Fraxinus at the expense of Quercus pubescens, with less pollonifera capacity. The deforestation of the slopes has also favored the expansion of the Mediterranean floristic contingent: the species that constitute it, primarily settled in very steep semirupestri stations, They have joined to a Pontic-Illyrian contingent in form extensive populations herbaceous-camefitici benefiting from xerothermic conditions that are established in microclimatic level to direct sunlight exposure of an already poor soil water for its coarse texture. Among the species surveyed we were distinguished representative florule 5 different environments and different types of vegetation in the area studied: 165 species represent the flora coenosis rupicole heliophilous and primary and secondary xeric grasslands (occupying an extension of 40% of ' studied area), 140 are related to forests, forest edges, woodlands and scrub (18%), 51 to the rich meadows (10%), 56 to damp places (river beds, near a lake, pools of water, rocks stillicidiose) ( 5%), 158 Finally thrive on denuded soils, roads margins, root crops, ruins, beaches, walls, etc. (27%). The comparison of the biological spectra of florule shows a clear predominance of hemicryptophytes in the first 4 groups (respectively 55.8%, 38.6%, 76.5%, 50%) and of the last therophytes (60%). It is also well represented in the camefite first grouping (20%) and the phanerophytes geophytes and in the second (25% and 22.1%). Chorological spectra show a significant dominance of Mediterranean elements (mainly species eurimediterranee) and Pontic-Illyrian (41.1% and 16%) in the first group and species subcosmopolite last (50%). These elements are poorly represented in other clusters.
|Number of pages||1|
|Publication status||Published - 1998|