镉胁迫对2种酸性土壤地肤生长及其修复镉能力的影响

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Abstract To solve the serious pollution of heavy metal cadmium (Cd) in acidic farmland soils in southern China, the soils under initial Cd stress (with concentrations of 1.253, 1.553, 2.153, 2.753, 4.253, 10.253mg/kg) and pH 6.10 (T treatment group) and pH 5.00 (TS treatment group) were used as potting soils, and Kochia scoparia (L.) was selected as restoration plant to study the tolerance of Kochia scoparia (L.) in Cd contaminated soils and the effect of initial soil pH and Cd concentration on the ability of Kochia scoparia (L.) extracting Cd from the soils through greenhouse pot experiments. The results showed that in all treatment groups, the biomass of mature Kochia scoparia (L.) stems was higher than that of the roots. The available Cd content in rhizosphere and non-rhizosphere soils of T treatment group was higher than that of TS treatment group. The Cd content in the stems of Kochia scoparia (L.) was higher than that in the roots, and the bioconcentration coefficient of Kochia scoparia (L.) roots and stems were all greater than 1. The Cd content in soils before and after planting was compared and analyzed, and the results showed that the Cd removal rates per pot of Kochia scoparia (L.) were 0.84%~1.85% and 0.94%~2.38% in T and TS treatments, respectively, indicating that Kochia scoparia (L.) can better remediate Cd pollution in acid soils. In the T treatment group, the removal rate reached the highest of (0.62±0.16)% when the Cd concentration in soils was 2.753mg/kg, while in the TS treatment group, the removal rate of Cd was the highest of (0.79±0.07)% when the Cd concentration in soils was 1.253mg/kg. The results showed that Kochia scoparia (L.) has a good effect to extract and remediate Cd pollution of acid soils in farmland, and it is an ideal restoration plant.

Key words： cadmium stress Kochia scoparia (L.) phytoremediation cadmium absorption acid soil

Received: 08 October 2022

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	YANG Hai-jun
	Guo Jia-yuan
	TAN Ju
	TAN Lu
	ZHU Shu
	WU Liang
	ZHANG Hao
	NIU Hong-yu
	WANG Fan

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YANG Hai-jun,Guo Jia-yuan,TAN Ju等. Effects of cadmium stress on the growth and cadmium remediation of Kochia scoparia (L.) in two kinds of acid soils[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2423-2433.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2423

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