Flora vascolare del Capo di Monte Santu (Sardegna centro orientale)

Abstract

-In this paper thè authors analyse thè land cover transformation in thè mine district of Montevecchio, through thè integration of vegetational and multitemporal landscape analysis. Por this purpose, three important dates (1955, 1977, 2000) of thè district history have been considered and two different periods are analysed (1955-1977 and 1977-2000). Multitemporal analysis was carried out through thè study of aerial photographs which resulted in thè production of three 1:10.000 land cover maps. Vegetational data were obtained through thè phytosociological study of thè area. The results show thè evolution of thè naturai vegetation as generai trend in thè territory. Particular analysis was carried out on thè mining areas (mining dumps, surface mines and tailing dams) to understand how much and how have been re-colonized by thè native vegetation. Por thè mining dumps thè main transformations are towards thè mediterranean maquis, thè garrigue and thè corkoak woods. The surface mines was stable in thè first period for 73.6% and thè main changes are due to thè diffusion of naturai vegetation (e.g. to mediterranean maquis 14.7%). With regard to thè tailing dams we observed an increase of stability (from 81.6% to 96.1%) together with a global increase of surface from 1955 to 2000. Therefore, thè integration of thè multitemporal and thè vegetational analysis made possible to register a significant evolution of thè vegetation cover on incoherent and polluted materials in relatively short times.