The efficiency assessment of oil- polluted soil recultivation methods

A complex of abiotic and biotic parameters for the efficiency evaluation of oil- polluted soils recultivation methods in the European Subarctic region is proposed.Abiotic parameters which reflect dynamics of transformation of oil in soil were applied. These were technogenesis diagnostic ratio (TDR) for polycyclic aromatic hydrocarbons (PAH) which showed a ratio between hydrocarbons of technogenic and natural genesis, and also the CPI index (carbon preference index) which was mathematical expression of a distribution model of aliphatic hydrocarbons. The biotic parameters reflecting the dynamics of soil biota at oil pollution were provided. Data on the number of microorganisms - oil-destructors was analyzed. Application of data on catalase and dehydrogenase activity of soil, and also Gmea index - geometrical mean of the enzymatic activity, was recommended. Phytocenosis dynamics was estimated according to a projective cover degree and species composition. The model of soil microfauna progressive succession was provided as a diagnostic one. Such taxonomical groups of microfauna as dipterous (larvae), kollembola, mesostigmatid mites and oribatid were selected for biomarkers of specific stages of succession. Parameters of microarthropod diversity, such as population density, number of taxonomic groups and their relative abundance, abundance and taxonomic composition of trophic groups: predators and saprophagous - were used as indicators.The example of industrial site recultivation demonstrates the practical application of a complex of indices and parameters of diversity of soil biota.