Abstract
The effect of continuous monospecie cropping on the microbial activity of arable semiarid soils was studied. Soil cultivation reduced organic carbon and humic substance contents. The total carbohydrate content was little influenced by the type of monospecie whereas the water-soluble carbohydrate and soluble carbon content were affected. The soils with unirrigated crops showed the lowest values of microbial biomass carbon and basal respiration. The high qCO2 values suggest a certain instability of the arable soils. In general, monospecie cropping in semiarid areas had a negative effect on enzymatic activities particularly in soils where unirrigated crops were grown. The soils dedicated to monospecie cropping showed lower values of microbiological and biochemical properties than native soils.
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