ISSN 0235-7224
ISSN 2029-0586 (online)
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2009 m. Nr. 2
Microbial mineralization of organic matter in bottom sediments of small anthropogenised lakes
Alina KREVŠ, Alė KUČINSKIENĖ
The peculiarities of total (aerobic and anaerobic) organic matter (OM) mineralization and microbiological suphate reduction intensity were studied in profundal bottom sediments of anthropogenised lakes situated in surroundings of Vilnius (Salotė, Gilužis and Gineitiškės) in May, July and September 2006. The research showed that organic carbon content varied from 13.7 to 37.4% of dry weight and the highest was estimated in Salotė (up to 37.4%) and Gineitiškės (30.8%). The intensity of OM mineralization varied from 648 mg to 2830.6 mg C/m2 d–1. Anaerobic decomposition prevailed in the total mineralization of OM and was most intensive in summer in Lake Gineitiškės. The process of terminal anaerobic OM mineralization – sulphate reduction was most intensive in Lake Gilužis (2.6 mg S2–/dm3 d–1) and correlated with sulphate concentration. The accumulation of high amounts of OM in bottom sediments and its intensive mineralization may stimulate the processes of secondary eutrophication and a lower the recreation value, especially in such shallow lakes as Salotė and Gineitiškės.
Keywords: organic matter, aerobic and anaerobic mineralization, sulphate reduction, bottom sediments, lakes
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