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    STUDIA BIOLOGIA - Issue no. 2 / 2011  
         
  Article:   EFFECTS OF ZINC, LEAD AND CADMIUM POLLUTION ON THE STRUCTURE AND ACTIVITIES OF SOIL BACTERIAL COMMUNITY.

Authors:  CODRUŢA VIOLETA SIMULE, MIHAIL DRĂGAN-BULARDA. 		 
       
         
  Abstract:  The impact of human activities on soil quality has increased over the past decades due to population growth and extensive exploitation of natural resources, including soils. Chemical tests measure the amount of pollutants but they do not reflect the environmental consequences resulting from their mobilization, accumulation along the food chain and specially their impact on key metabolic processes in the soil. Biological methods, in turn, reflect the impact on the organisms from the soil, thus showing enhancement / inhibition of the activities under stress conditions. In order to establish the effect of pollutants on edaphic soil communities of microorganisms, the ecophysiological group dynamics of bacteria and enzymatic activities were analyzed in the presence of different concentrations of environmental pollutants (zinc, lead and cadmium). This study allowed and identification of bacterial parameters sensitive to pollution. Bacterial density and intensity of enzymatic activities showed quantitative variations depending on the type and concentration of metal. The most sensitive to pollution were found to be nitrifying bacteria and dehydrogenase activities.

Keywords: bacterial communities, enzymatic activities, heavy metals, soil pollution. 		 
         
     
         
         
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