0.05). But the limitation of C caused the microbial activity and consequently total C mineralization to be increased with the addition of crude oil levels. The addition of crude oil and nitrogen simultaneously, did not affect microbial respiration rate, too (P>0.05). All the N treatment and high level of pollutant (crude oil 10%) caused the enhancement of soil microbial biomass C. But in crude oil 5%, an increase of microbial biomass C was shown in the control and NO3 treatments, while this parameter decreased in NH4 and NH4+NO3 treatments. In conclusion, crude oil stimulates microbial activity and biomass by reason of containing C and the other nutrients and also biodegradability of some of its compounds and derivatives. Its toxic elements and compounds have inhibitory effects on microbial communities. However, N addition to crude oil contaminated soils may cause the reduction of harmful effects of toxic hydrocarbon compounds.]]>
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