Hydrochemical and microbiological characteristics of alkaline Bolsherechensky spring

For the first time the physical and chemical parameters and microbiological characteristics of subthermal alkaline spring were defined. This spring is located in Bolshaya Rechka (Kabansky District, Republic of Buryatia). The temperature of output water varies from 19.3 to 20.TC, pH 9.3. Cyanobacterial mats, dominated by diatoms, green algae and cyanobacteria of genera Phormidium and Oscilatoria, is developed in the spring. The growth of aerobic and anaerobic bacteria-destructors of organic matter was observed at the temperature range from 20 to 50 оС.