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Impact of oil contamination on ecological functions of peat soils from West Siberia of Russia
Author(s) -
Kovaleva Ekaterina I.,
Trofimov Sergey Ya.,
Zhongqi Cheng
Publication year - 2020
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.1002/jeq2.20171
Subject(s) - peat , soil water , environmental science , contamination , biomass (ecology) , soil respiration , environmental chemistry , respiration , ecology , chemistry , soil science , biology , botany
For more than a century, the need for energy has exerted high demand on oil production and led to significant negative impacts on soil and water resources. The aim of our work was to assess such impacts on the ecological functions of oil‐contaminated soils in West Siberia of Russia. The total petroleum hydrocarbons (PHC) content in contaminated soils varied between 3.7 and 390 g kg −1 . Although peat had the ability to absorb some PHC, excess oil migrated in soil both downward and laterally. Catalase activity, soil respiration activity (basal respiration [BR], microbial biomass carbon [Cmic], and specific respiration activity [qCO 2 ]), and Enchytraeus albidus survival and reproduction rates showed significant negative correlations with PHC concentrations, and thus they can be used as guides for establishing acceptable PHC limits in peat soils. Based on the Logit model, the concentration of PHC in peat soil that corresponds to ∼20% reduction on functions (worm reproduction, catalase activity, and basal respiration) is about 40–50 g kg −1 . The concentrations of PHC that will result in 80% functional reductions (i.e., near‐complete loss on functional activities) are worm production (177 g kg −1 ), catalase activity (123 g kg −1 ), and basal respiration (311 g kg −1 ). This study provides quantitative understanding of the ecological impact of PHC contamination on peat soils and thus helps to establish science‐based guidelines for the protection of ecological functions and services of peatland soils.