根系分泌物对生物强化修复PAHs污染土壤的影响

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Abstract A soil microcosm experiment was conducted to investigate the effect of bioaugmentation on polycyclic aromatic hydrocarbons (PAHs)-contaminated soil and the influence of root exudates on bioaugmentation. The content of PAHs residue was decreased by 15.8% with PAHs-degrading bacteria (Brucella, Ochrobactrum, Sphingomonas, Klebsiella and Acinetobacter sp.) compared to CK in 21d. The addition of ryegrass or artificial root exudates significantly enhanced the bioaugmentation effect and the contents were decreased by 26.3% and 24.6% compared to CK, respectively. These 3bioaugmentation treatments altered the soil bacterial community structures. Compared with the inoculation of PAHs-degrading bacteria alone, the addition of root exudates changed the community structure more significantly and increased the abundance of aromatic compounds degradation-related genes more markedly, indicating that the root exudates affected the bacterial community by promoting the growth of PAHs-degrading bacteria and thus enhanced the bioremediation effect. The different effects of the two types of root exudates on soil bacterial community did not lead to a difference in their contribution to the promotion for bioaugmentation. This study can provide a reference for optimizing bioaugmentation remediation techniques for organic-contaminated soils.

Key words： Polycyclic aromatic hydrocarbons (PAHs) soil remediation ryegrass root exudates bioaugmentation

Received: 25 April 2023

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	Articles by authors
	LI Yu-ting
	BAO Wen-xiu
	ZHANG Wen
	WANG Jia-ning
	HUANG Yu-jie
	SONG Fan-yong

Cite this article:

LI Yu-ting,BAO Wen-xiu,ZHANG Wen等. Effects of root exudates on bioaugmentation of PAHs-contaminated soil[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4183-4193.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4183

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