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Microbial biomass was evaluated by determining the content of soil phospholipids in the upper and illuvial horizons of different-age kastanozems and solonetzes of the Bronze Age, Early Iron Age and Medieval time, located on various soil-forming rocks, in the zone of dry steppes, as well as in modern background soils. The microbial biomass in the upper horizon of modern Kastanozem on loess-like loams was 2800 ?g per g of soil that was 3 and 4 times higher than that in the upper horizon of modern kastanozem and mode...