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THE IMPORTANCE OF POPLAR SPECIES IN THE ECOLOGICAL PROCESS OF STRONGLY POLLUTED INDUSTRIAL WATERS
Abstract
From a lithological point of view, the studied territory - Central Heating System of Rovinari is made up of deposits and in the depression quaternary deposits are found, belonging to the holocene (gravel and sand). In the Jiu - Motru River the deposits contain 4-6 layers of lignite, of low thickness, so the area was affected by coal extraction. From the point of view of the hydrographic network, except those of the lower order, the waters passing through the region belong to the basin of Jiu and Tismana. These waters are heavily polluted with coal dust and material from mining areas. The sterile dumps, arising as a result of the mining activity in the area, are heterogeneous deposits with very different lithology, with the participation in different proportions of the fractions of sand, clay and gravel to which are added fragments of dispersed coal. Under the influence of various natural modeling factors (rain, wind, frost, thaw, etc.), the dumps tend to form their own hydrographic, morphodynamical systems, which, depending on the characteristics of the dump, evolve toward habitats, more or less favorable to the installation of woody vegetation.
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