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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI
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Rezumat: Eleven sediment and water samples from the Arieş River were studied microbiologically, enzymologically and physico-chemically. The following four ecophysiological bacterial groups have been studied: aerobic mesophilic heterotrophs, ammonifiers, denitrifiers and iron-reducers. The following four enzymatic activities have been measured: phosphatase, catalase, actual and potential dehydrogenase. Some physico-chemical parameters of water were also analyzed: pH, Eh, conductivity and O2 concentration. The presence of all four ecophysiological bacterial groups was registered in all the studied sediments. The descending ranking of their abundance was: aerobic mesophilic heterotrophs > ammonifiers > denitrifiers > iron-reducers. Based on the bacteria number of each ecophysiological group, the bacterial indicators of sediment (BISQ) and water (BIWQ) quality were calculated. The four enzymatic activities were noticed in all the studied samples. On the base of the analytical data, the enzymatic indicators of sediment quality (EISQ) were calculated. As in the case of the microbiological analyses, the enzymatic potential of sediments increases downstream the river. The lowest values of both bacterial and enzymatic indicators were registered in the P11 site, where the river Abrud flows into Arieş, indicating a strong local pollution, probably caused by the mining enterprise in Roşia Montană. The physico-chemical parameters were also very different as compared to the other sampling sites. A statistically significant strong positive correlation |
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