浒苔生物炭促进土壤Pb固定并缓解植物Pb毒性

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Abstract In this paper, Enteromorpha prolifera biochar prepared at 400℃ (BC400) and 600℃ (BC600) was added to the soil containing 1200mg/kg of Pb at a concentration of 30g/kg. A pot experiment of Vetiveria zizanioides (L.) Nash was conducted to study the effects of Enteromorpha prolifera biocharon Pb immobilization in the soil and phytotoxicity of Pb in plants. The results showed that the plants and biochar showed significant synergistic effects on Pb immobilization. Such effects increased Pb immobilization rates by 16.89% and 14.82% comparing with the biochar group alone, and increased Pb immobilization rates by 17.40% and 15.02% comparing with the plant alone. The physical and chemical properties of biochar affected the immobilization of Pb. The pH value of BC400 was lower than BC600, whereas BC400 had a better immobilization effect than BC600. This was because the hydroxyl (—OH) and carbonyl (C═O) groups of BC400 were more abundant than the BC600, and the microporous structure was more intact than BC600. Enteromorpha prolifera biochar inhibited the absorption of Pb by Vetiveria zizanioides(L.) Nash and promoted the growth of Vetiveria zizanioides(L.) Nash. BC400 reduced the enrichment factor and the concentration of Pb in the aboveground and root parts of Vetiveria zizanioides(L.) Nash (by 23.50% and 22.92%, respectively). BC400 increased the biomass, chlorophyll content, and root vitality of Vetiveria zizanioides(L.) Nash. It also increased SOD, CAT, and POD activities, and reduced malondialdehyde content by 13.40%. In summary, Enteromorpha prolifera biochar adsorbed Pb better through providing a higher pH value, its microporous structure, and fixed more Pb in soil by increasing the binding sites with metals through functional groups, so as to reduced phytotoxicity, and improved the viability of Vetiveria zizanioides(L.) Nash. In view of the abundance of biomass resources of Enteromorpha prolifera in the coastal area, the combined action of biochar and plants can be used as one of the technical measures for remediation of Pb contaminated soil.

Key words： Enteromorpha prolifera biochar Pb immobilization Vetiveria zizanioides (L.) Nash antioxidant system

Received: 26 December 2019

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X53

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	WU Hai-xia
	SUN Ping
	LU Shuang
	REN Li-xin
	CHEN You-yuan

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WU Hai-xia,SUN Ping,LU Shuang等. Enteromorpha prolifera biochar promoted the immobilization of Pb in soil and reduced the phytotoxicity of Pb to Vetiveriazizanioides (L.) Nash[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(8): 3530-3538.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I8/3530

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