深圳市土壤重金属背景含量垂向分布与理化特征

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Abstract In order to find out the background content and vertical distribution of six conventional heavy metals (Cd, Hg, Cr, Cu, Zn and Ni), and to explore the relationship between the background content of heavy metals and the physicochemical parameters in different soil profile levels in Shenzhen, 50 typical soil profile sample points were laid out in the area of basic ecological control line, and 150 soil samples were collected at each point according to three layers A, B and C. The results showed that there were significant differences in the background contents of heavy metals in different sampling levels of soil profile. With the increase of depth, the background contents of Cr, Cu, Zn and Ni increased gradually, while Cd and Hg decreased first and then increased. The background contents of six heavy metals in Shenzhen soil profile were relatively low, which was slightly lower than the national soil environmental background values in the Seventh Five Year Plan. The physicochemical parameters of soil profile showed typical Southern soil characteristics. The pH values of soil were acidic. With the increased of depth, the soil bulk density, Al₂O₃and Fe₂O₃ contents increased gradually, while the contents of organic matter and CaO decreased gradually, and the cation exchange capacity increased first and then decreased; the characteristics of soil mechanical composition were that sand particles were the most, silt particles were the second, and clay particles were the least. The correlation between the background content of heavy metals and physicochemical parameters was analyzed, and it was found that Fe₂O₃, Al₂O₃ and soil mechanical composition had the most significant correlation with the background content of heavy metals in soil. The stepwise multiple linear regression analysis showed that the physicochemical parameters affecting the background content of heavy metals in soil were found to be Fe₂O₃, Al₂O₃, mechanical composition and cation exchange capacity.

Key words： soil profile heavy metals background content physicochemical parameters Shenzhen

Received: 12 April 2022

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	Articles by authors
	ZHAO Shu-hua
	LUO Fei
	XI Xiu-ping
	YANG Kun
	LIAO Man
	ZHAO Yan
	WU Jing-ya
	LIN Ting

Cite this article:

ZHAO Shu-hua,LUO Fei,XI Xiu-ping等. Vertical distribution of background content of heavy metals and physicochemical parameters in soil of Shenzhen City[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5246-5254.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5246

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