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Comparing the removal of polycyclic aromatic hydrocarbons in soil after different bioremediation approaches in relation to the extracellular enzyme activities

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Journal of Environmental Sciences 2019年第2期31卷 249-258页

作者： zdeněk ko?ná? Tereza ?ástková Lucie Wiesnerová Luká? Praus Ivan Jablonsky Martin koudela Pavel Tlusto? Department of Agroenvironmental Chemistry and Plant nutrition Faculty of AgrobiologyFood and Natural ResourcesCzech University of Life Sciences Prague Department of Horticulture Faculty of AgrobiologyFood and Natural ResourcesCzech University of Life Sciences Prague

A 120-day experiment was conducted to compare the removal of polycyclic aromatic hydrocarbons(PAHs) from agricultural soil after natural attenuation(nA), phytoremediation(P), mycoremediation(M), and plant-assisted mycoremediation(PAM) approaches in relation to the extracellular enzyme activities in soil. The nA treatment removed the total soil PAH content negligibly. The P treatment using maize(Zea mays) enhanced only the removal of low and medium molecular PAHs. The Pleurotus ostreatus cultivated on 30–50 mm wood chip substrate used in M treatment was the most successful in the removal of majority PAHs. Therefore,significantly(p kg dw(dry weight)(36%) from all tested M treatments was observed. When using the same fungal substrate together with maize in PAM treatment, the total PAH removal was not statistically different from the previous M treatment. However, the maize-assisted mycoremediation treatment significantly boosted fungal biomass, microbial and manganese peroxidase activity in soil which strongly correlated with the removal of total PAHs. The higher PAH removal in that PAM treatment could be reflected in the following post-harvest time. Our suggested M and PAM approaches could be promising in situ bioremediation strategies for PAH-contaminated soils.

关键词： PAHs Biodegradation White-rot fungi Ligninolytic enzymes Microbial activity

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