Seasonal Dynamics of Bacterial Community Structure in Diesel Oil-Contaminated Soil Cultivated with Tall Fescue ( Festuca arundinacea )

Yun-Yeong Lee, Soo Yeon Lee, Sang Don Lee and Kyung-Suk Cho
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Yun-Yeong Lee: Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Korea
Soo Yeon Lee: Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Korea
Sang Don Lee: Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Korea
Kyung-Suk Cho: Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Korea

IJERPH, 2022, vol. 19, issue 8, 1-13

Abstract: The objective of this study was to explore the seasonal characteristics of rhizoremediation and the bacterial community structure over the course of a year in soil contaminated with diesel oil. The soil was contaminated with diesel oil at a total petroleum hydrocarbon (TPH) concentration of 30,000 mg-TPH·kg-soil ?1 . Tall fescue seedlings were planted in the contaminated soil and rhizoremediation performance was monitored for 317 days. The TPH concentration gradually declined, reaching 75.6% after day 61. However, the TPH removability decreased by up to 30% after re-contamination in the fall and winter. The bacterial community structure exhibited distinct seasonal dynamics. Genus Pseudomonas significantly increased up to 55.7% in the winter, while the genera Immundisolibacter and Lysobacter , well-known petroleum hydrocarbon (PH)-degrading bacteria, were found to be positively linked to the TPH removal rate. Consequently, knowledge of this seasonal variation in rhizoremediation performance and the bacterial community structure is useful for the improvement of rhizoremediation in PH-contaminated environments.

Keywords: rhizoremediation; diesel-contaminated soil; tall fescue; bacterial community structures; association analysis (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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