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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEÅž-BOLYAI
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Rezumat: The Tarnita dam reservoir takes part from big dam reservoires disposed in a „water fall” system, in upper basin of the Somesul Mic river. The reservoir has the following functions: mainly - energetics, the averting of the floods, to attenuate the floods waves and, in the future, supply with drinking water for Cluj-Napoca city. The study consists in determination of ten ecophysiological groups of bacteria from water and sediment of the lake, involved in recirculation of different organic residue and also in transformation of some mineral substances, from water and sediment of the lake. From both water and sediment of the lake have been established the following ecophysiological groups of bacteria: ammonizing, nitrifying, denitrifying, aerobe and anaerobe sulfur-reducing, sulfur-oxidizing, anaerobe sulfate-reducing, iron-reducing and amilolitic. The samples (fouteen water samples and seven sediment samples) were collected seasonally, from different points and depths. The results of the analyses shown that the number of bacteria from each group showed seasonally variations and variations depending on sampling site. For global establishing of the microorganisms abundance from the water lake and for appreciation of the microbial potential of the sediment, there was elaborated a method for calculation the bacterial indicator of water quality (BIWQ), respectively the sediment quality (BISQ). For obtaining an ensemble image of the complex processes that happen in these habitats with a special signification, the indicators of the quality have been statistically correlated. |
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