北京东南郊土壤重金属元素分布及其在表层土壤中的富集特征

doi:10.11720/wtyht.2022.1417

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Abstract

By collecting and analyzing the heavy metal elements insurface (0~20 cm) and deep (160~200 cm) soil samples in southeastern suburbs of Beijing, the distribution characteristics of elements in soil in this area were ascertained.The spatial autonomy of heavy metal elementswas explored by establishing a semivariogram model. The enrichment characteristics of elements in surface soil were discussed,as well as the correlation of the enrichment coefficient. On this basis of the research, the significant enrichment areas of heavy metal elements are divided, and the reasons for the enrichment are explained and analyzed in depth.The results show that:The content levels of Cd, Cu, Hg, Pb, and Zn in surface soil of the study area are significantly higher than those in the deep layer, with a gap of 1.2 to 3.9 times. Compared with soil’s heavy metal content in Beijing and China,, the soils in the study area is relatively rich in Cd and Hg. As it was affected by many factors such as the source of soil-forming parent material and human activities, the spatial autocorrelation of As and Cr in surface soil is strong, and the spatial autocorrelation of Cr in the deep soil is weak. The spatial autocorrelation of other elements in the surface and deep layers is medium. As, Ni, and Cr in the surface soil are weakly enriched.But Cu, Pb, Zn, Cd, Hg are strongly enriched, and Hg is the most enriched. Based on the enrichment coefficient, five significant enrichment areas of heavy metal elements are delineated.The division of this area clearly reflects that human life, agricultural planting, and industrial production are important factors that cause the accumulation of heavy metal elements in surface soil.Therefore, it is necessary to pay close attention to the distribution of soil elements in human settlements, agricultural planting areas, and industrial enterprise distribution areas. The purpose is to prevent the deterioration of the soil environment and ensure the safety of the ecological environment.

Key words： soil heavy metal elements spatial structure distribution properties enrichment characteristics

Received: 29 July 2021 Published: 28 June 2022

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P632

Corresponding Authors: LI Huan E-mail: 18601040279@163.com;lihuan_8@163.com

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	Qin-Rui ZHANG
	Huan LI
	Yu-Fei DENG
	Yong HUANG
	Bo ZHANG
	Yi-bo XU

Cite this article:

Qin-Rui ZHANG,Huan LI,Yu-Fei DENG, et al. Distribution of heavy metal elements in soil of the Southeastern suburbs of Beijing and their enrichment characteristics in surface soil[J]. Geophysical and Geochemical Exploration, 2022, 46(2): 490-501.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1417 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I2/490

Sampling points map of study area

The analysis method and detection limit of target elements

项目		As	Cd	Cr	Cu	Hg	Ni	Pb	Zn
表层	X/10^-6	8.64	0.171	55.1	24.9	0.079	27.3	25.5	76.1
	X_min/10^-6	3.89	0.070	37.6	12.6	0.011	17.8	17.7	37.3
	X_med/10^-6	8.61	0.165	55.0	24.3	0.059	26.8	24.9	73.4
	X_max/10^-6	20.7	0.611	81.8	122	1.54	46.3	70.4	288
	S/10^-6	2.20	0.058	6.20	9.30	0.126	4.40	5.50	23.1
	C_v/%	25.5	33.4	11.2	36.4	134	16.0	21.4	30.3
深层	X/10^-6	8.76	0.108	53.8	21.0	0.026	26.8	20.4	59.4
	X_min/10^-6	1.82	0.040	15.9	4.50	0.005	8.30	13.4	20.2
	X_med/10^-6	8.52	0.104	52.9	20.6	0.015	26.2	20.0	57.8
	X_max/10^-6	28.6	0.550	128	39.9	0.882	47.7	46.8	107
	S/10^-6	3.97	0.049	12.1	7.60	0.064	7.80	4.20	17.6
	C_v/%	45.4	44.6	22.4	36.1	244	29.0	20.7	29.6
北京市表层土壤/1 $0 - 6 [45]$		9.30	0.147	66.0	23.0	0.045	27.0	25.0	67.0
北京市深层土壤/1 $0 - 6 [45]$		9.70	0.096	67.0	23.0	0.023	29.0	23.0	64.0
中国表层土壤/1 $0 - 6 [45]$		8.50	0.140	58.0	23.0	0.066	25.0	24.0	69.0
中国深层土壤/1 $0 - 6 [45]$		8.40	0.095	58.0	20.0	0.017	26.0	20.0	62.0

Statistical eigenvalues of heavy metal elements in surface soil and deep layers soil

Comparison of mean values of heavy metal elements

Semi-variogram models of elements in soil and related parameters

Correlation of heavy metal elements in surface soil and deep layers soil

Percentage of the enrichment degree of heavy metal elements in soil

Distribution of heavy metal enrichment coefficient in soil

The division of areas with significant enrichment of heavy metal elements in surface soil

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