Influence of phytorecultivation measures on the activity of the microbial community of oil-contaminated alluvial soddy soil
Keywords:
alluvial soil, petroleum hydrocarbons, basal respiration, substrate-induced respiration, microbial respiration coefficientAbstract
The respiratory activity of reclaimed oil-contaminated alluvial soddy light loamy soil after two successive sowing of monocotyledonous (spring wheat) and dicotyledonous (seed pea) plants was studied. The basal respiration rate (Vbasal) increased with an increase in the residual content of oil products in the soil upon the primary sowing of wheat. Repeated sowing of wheat reduced the Vbasal and leveled the differences between the control and contaminated soil samples. Repeated sowing of wheat stabilized the substrate-induced respiration (Vsir) of the contaminated soil. Both the primary and the repeated sowing conditions showed no significant differences in Vbasal under wheat and pea sowing. Differences between soils sown with different crops were related to Vsir. The secondary sowing of peas led to an increase of Vsir, while in the soil under wheat, Vsir was detected at the control level. Repeated seeding of both crops contributed to a decrease in Qr to 0.12‒0.17, reflecting the stabilization of the microbial pool and restoration of soil microbiota normal functioning.
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