Microbial communities in areas affected by formation of calcrete in thracian plane

The number of 13 physiological groups of microorganisms is counted in depth of two types of alkaline soils affected by formation of calcrete. The first soil type is characterized by the presence of calcrete nodules occupying the surface layer of soil profile from 5 to 38 cm, and the second soil type – of isometric calcrete nodules, settled in depth below 30-35 cm. During the spring and autumn, when the samples were collected, it was determined that in soil, which is more affected by formation of calcrete, the number of various heterotrophic aerobic and anaerobic bacteria, actinomycetes and fungi is 1 to 3 orders lower than in less affected soil. A similar effect was observed on the amount of nitrifying bacteria. Other factors that influenced the microbial community structure and number were also the various values of pH, fractions of organic carbon and total nitrogen

Microbial communities in areas affected by formation of calcrete in thracian plane

S. Bratkova, K. Nikolova, K. Gesheva