联合改良剂对桉树吸收重金属的作用——以矿区土壤中Cd、Zn和Cu为例

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Abstract In this study, pot experiments with five different kinds of mine soils were conducted to investigate the effects of combined amendments on some physiological indices of Eucalyptus, Cd, Zn and Cu contents in the roots, and BCR extraction states of Cd, Zn and Cu in soils. The implications of effects of amendments on forest restoration on mine soils were also discussed. Results indicated the biomass and chlorophyll contents of Eucalyptus changed by -7.6% ~ 158.8% and -0.7% ~ 23.1%, respectively, compared to the control group, while malondialdehyde contents of Eucalyptus decreased by 2.6% ~ 37.9% after the application of amendments. The changes of the biomass and malondialdehyde contents of some treatments were significant (P<0.05). After the application of amendments, available Cd, Zn and Cu in soils decreased by 12.5% ~ 63.8%, 1.6% ~ 54.7% and 16.2% ~ 57.6%, respectively. Cd, Zn and Cu concentrations in Eucalyptus roots decreased by 3.1% ~ 56.6%, -1.5% ~ 21.3% and 9.3% ~ 50.1%, respectively. Soil types demonstrated significant effects on the contents of Cd, Zn and Cu in Eucalyptus roots (P<0.05), however, ratios or dosages of the amendments had no significant effects (P>0.05). Among combined amendments, G3 achieved highest reduction of Cu in Eucalyptus roots compared to G1and G2in five different mine soils, while G1showed advantages in Cd and Zn reduction in Eucalyptus roots compared to G2and G3in two soils with highest heavy metal content. This study showed that the application of combined amendments greatly reduced the absorption of heavy metal by Eucalyptus, which could be beneficial to forest restoration of mine soils.

Key words： contaminated soil combined amendment Eucalyptus heavy metal BCR extraction state

Received: 15 January 2020

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X53

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	Articles by authors
	WENG Xia
	LONG Hai-yang
	YANG Xin-meng
	LUO Zi-jian
	SU Jiao
	WANG Wei-sheng

Cite this article:

WENG Xia,LONG Hai-yang,YANG Xin-meng等. Effects of combined amendments on the absorption of heavy metals by Eucalyptus—taking Cd, Zn and Cu of mine soils as example[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3911-3918.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I9/3911

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