碳酸盐岩风化成土过程重金属的迁移富集特征——以华南典型地区为例

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Abstract The weathered soil profiles were taken as the research objects from paddy and upland fields, which are typical agricultural lands in the carbonate rock regions of South China. The sources of soil heavy metals were traced via Pb isotope composition, and the vertical distribution and influencing factors of eight common types of heavy metals in the farmland soil profiles were systematically analyzed. The results revealed that the weathering of parent rocks was the main source of soil heavy metals in the study area, and the contents of heavy metals in the two profiles were found to be higher than the soil background value (0.056mg/kg). The enrichment of Cd tended to occur in the surface layer (0.49~2.15mg/kg) and the middle layer (0.75~1.87mg/kg) of the soil profiles, while that of the other elements tended to occur in the middle layer. The physicochemical properties and the mineral compositions of the soils, as well as the changes in the redox conditions exerted important impacts on the migration of heavy metals. The secondary enrichment of heavy metals in the soil profiles from the study area was attributed to the weathering process of carbonate rocks, while the impact of the leaching process on the migration and enrichment of heavy metals was more significant in the profile from the paddy field.

Key words： carbonate rock soil profile of farmland heavy metals vertical migration influence factor

Received: 28 October 2024

PACS:

X53

Corresponding Authors: 孙乾迎,责任作者,副研究员,sunqianying@scies.org E-mail: sunqianying@scies.org

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	SHI Xiao-xue
	SUN Qian-ying
	LU Yang
	WU Wen-cheng
	CHEN Wei-jie

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SHI Xiao-xue,SUN Qian-ying,LU Yang等. Migration and enrichment characteristics of heavy metals during the weathering and soil-forming process of carbonate rocks: A case study of typical areas in South China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 2063-2074.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I4/2063

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