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Pedosphere (3): 591--601, 2025
ISSN 1002-0160/CN 32-1315/P
©2025 Soil Science Society of China
Published by Elsevier B.V. and Science Press

Removal of petroleum hydrocarbons from contaminated soils: Analyses of soil enzymes and microbial community evolution during phytoremediation using Suaeda salsa

Xiaonuo ZHANG, Yaxi DENG, Goujian CHI, Hong Lü, Hongxia ZHAO

Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024 (China)

ABSTRACT

Rhizoremediation has emerged as a burgeoning approach for the removal of petroleum hydrocarbons (PHCs) from soil, with a primary emphasis on terrestrial plant systems. However, the mechanism of how soil microbiomes influence the dissipation of PHCs within a hygrophyte planting system has yet to be fully elucidated. This work concentrated on the potential evolution of soil microbiomes and their effects on PHC dissipation within the Suaeda salsa (L.) Pall. planting system in a pot experiment. Two representative compounds, polycyclic aromatic hydrocarbons (PAHs) and n-alkanes, were used as target PHCs. The findings revealed a significant efficiency in the dissipation of PHCs in soil with Suaeda salsa cultivation, particularly with respect to n-alkanes. The high dissipation efficiency of PHCs was the synergistic result of root accumulation and microbial biodegradation. The key microbes involved in PHC dissipation were revealed, with the dominant phylum Proteobacteria and genus Salinimicrobium. The alterations in microbial diversity and abundance were closely associated with root exudation and PHC exposure. Significant differences in enzyme activities, an indicator of soil health and fertility, were observed between the rhizospheric and non-rhizospheric soils, which was attributed to root exudation. This study offers novel insights into the phytoremediation potential for Suaeda in PHC-contaminated soils and serves as a valuable scientific reference for the phytoremediation of such soils.

Citation: Zhang X N, Deng Y X, Chi G J, Lü H, Zhao H X. 2025. Removal of petroleum hydrocarbons from contaminated soils: Analyses of soil enzymes and microbial community evolution during phytoremediation using Suaeda salsa. Pedosphere. 35(3): 591-601.

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