摘要：Major environmental problems in metallic mining areas come from the hazard of metal pollution of surrounding areas. Therefore, an appropriated management of these soils is necessary for minimizing the associated risks. Some properties of mining soils, such as elevated metal concentrations, pH and shortage of essential nutrients make them a poor medium for organism growth. Therefore, in order to make a stabilization of these mining areas, it is necessary to solve previously some adverse physical and chemical soil factors mainly associated to toxic heavy metals and soil structure. Thus, some wastes such as carbonate, demolition wastes and sewage sludge, were added to soils to provide the needed conditions for improving soil conditions. The aim of this research was to assess the soil evolution after amendments addition in a research area placed in the Cartagena-La Unión Mining District, SE Spain. This assessment was carried out by means of microbial community evolution and variation as an indicator of soil changes. Mining soils showed, in general, low numbers of microorganisms, and significant increases in microbial populations were observed after soil treatment.
