电场强化博落回修复铀镉复合污染土壤机理

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Abstract Pot experiments were conducted to investigate variations in biomass, the accumulation performance of uranium and cadmium, and the antioxidant enzyme activities of Macleaya cordata, and in organic acid content, the speciation of uranium and cadmium, the valence state of uranium of the root, and the structure of microbe community in its rhizosphere soil under the application of DC electric field at 0.3V/cm. The results showed that the total biomass of Macleaya cordata was increased by 15.33%~29.88%, the accumulation coefficients of uranium and cadmium in DC+U and DC+Cd treatment groups were increased by 90.84% and 93.33% The proportion of available uranium and cadmium in rhizosphere soil increased, respectively, and the contents of oxalic acid, tartaric acid, succinic acid, malic acid, and lactic acid were increased by 18.36%~45.31%, 58.62%~503.22%, 15.71%~118.99%, 12.34%~123.27%, and 25.97%~36.05%, respectively, the activities of POD and GSH-PX were increased by 13.63%~34.82% and 9.70%~28.64%, respectively. The proportions of bioavailable uranium and cadmium in the rhizosphere soil were increased significantly. Moreover, the stable U(IV) in the root of Macleaya cordata was transformed to mobile U(VI), which could easily migrate from the underground part to the aboveground part of the plant, and the proportions of Acidobacteria and Ascomycota in the rhizosphere microbial community were increased, and they promoted Macleaya cordata's tolerance to and accumulation of uranium and cadmium mainly by improving enzyme activity.

Key words： DC electric field enhancing Macleaya cordata phytoremediation uranium and cadmium co-contaminated

Received: 01 March 2020

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	Articles by authors
	HU Nan
	ZHU Ruo-nan
	CHENG Hao
	TAN Guo-chi
	DONG Xue
	ZHANG Hui
	MA Jian-hong
	WANG Yong-dong
	DING De-xin

Cite this article:

HU Nan,ZHU Ruo-nan,CHENG Hao等. Mechanism for electric field enhancing remediation of uranium and cadmium co-contaminated soil by Macleaya cordata[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4457-4467.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4457

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