滇西地区土壤重金属来源解析及空间分布

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Abstract A total of 4193 samples of surface soils were collected in the high background area of heavy metals in Western Yunnan, and the contents of eight heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn) were analyzed. The sources of soil heavy metals and the relationship between soil parent materials and land use patterns were discussed by using correlation analysis, principal component analysis (PCA) and one-way analysis of variance (ANOVA). Moreover, the spatial distribution characteristics of soil heavy metals were analyzed by geostatistics. -The average contents of eight heavy metals in study area were higher than the national soil background value, but lower than the pollution risk screening value. The average As, Cd, Cu, Ni, Pb and Zn contents were equivalent to the background value of soils in Yunnan Province, and the average contents of Hg and Cr were 2.35 and 1.60 times greater than the background value, indicating heavy metals have been accumulated in different degrees in surface soils. The Cr, Cu and Ni in surface soils are mainly controlled by parent materials. However, Cd, Zn and Pb are mainly affected by human activities, including mining activities, transportation and coal combustion, and Cd and Zn are affected by parent materials to a certain extent. The As and Hg are predominantly anthropogenic sources, which include mining activities, agricultural activities and coal combustion. The average Cd, Cr, Cu, Hg and Ni concentrations were the highest in the soils derived from sedimentary rocks, and the average As, Cd, Cr, Cu, Hg, Ni and Zn concentrations were the highest in grassland. High-Cu, Ni and Cr concentrations occur in the western and southern part of study area, and are spatially associated with the occurrence of sedimentary rocks and copper, iron and mercury deposits in the area. The areas with high Pb, Cd and Zn contents are largely consistent with the distribution of Pb, Zn and Hg ore deposits in study area. High-As and Hg concentrations in surface soils has a high spatial consistency with the distribution of hydrothermal metal deposits such as lead-zinc deposits and mercury deposits, and also shows a high background characteristic in areas with intensive human activities.

Key words： heavy metals pollution source spatial distribution soil Western Yunnan

Received: 18 January 2021

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	WANG Qiao-lin
	SONG Yun-tao
	WANG Cheng-wen
	XU Ren-ting
	PENG Min
	ZHOU Ya-long
	HAN Wei

Cite this article:

WANG Qiao-lin,SONG Yun-tao,WANG Cheng-wen等. Source identification and spatial distribution of soil heavy metals in Western Yunnan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3693-3703.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3693

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