土壤学报2023，Vol.60Issue(5)：1363-1377,15.DOI:10.11766/trxb202307090262
土壤重金属地质高背景成因、风险与管控研究进展
Research Progress on the Causes,Risks,and Control of High Geological Background of Heavy Metals in Soils
摘要
Abstract
The high geological/geochemical background of heavy metals in soil is one of the hot spots in academic research in recent years,involving geology,geochemistry,pedology,environmental science and other disciplines.High concentrations of heavy metal(loid)s in soils including cadmium(Cd),arsenic(As),chromium(Cr),nickel(Ni),etc,pose a threat to environmental quality,food safety,and ecological security.This review uses bibliometric methods to analyze the research progress and recent hot spots in the field of high geological background of soil heavy metal.The distribution characteristics,causes,and types of high geological background of soil heavy metals in the world and China are systematically reviewed.The geological high background area in the world shows diversified distribution characteristics,and the causes of geochemical anomalies are complex.In China,the geological high background is mainly distributed in the southwest(Guangxi,Yunnan,Guizhou,Sichuan,etc.),the east,the Yangtze and the Pearl River basins,and is closely related to long-term weathering and migration and transportation of carbonate rock,basalt,black shale and other rocks.Lithological types,topography and organisms are key factors that affect elemental geochemical processes in the differentiation of heavy metals during soil formation.The total concentrations of heavy metals(especially Cd)in soils of geological high background areas often exceeded the risk screening values of the Chinese Soil Environment Quality Risk Control Standard for Soil Contamination of Agricultural Land(GB 15618-2018).Also,the bioavailability of heavy metals is usually low,especially in carbonate rock areas.The superposition of human activities has intensified the migration,diffusion and enrichment of heavy metals in the soils of geological high background areas,increasing the risk of heavy metal absorption by crops and human health.The screening values for elements such as Cd in the current standards in China are not suitable for ecological risk assessment of geological high background soils,therefore,soil Cd thresholds based on extractability or bioavailability need to be developed.There is still a lack of specialized research on the safe utilization and remediation technology for high geological background areas where the heavy metals concentration in crops exceed the standard.This review aims to provide theoretical and technical references for understanding the mechanism and risk control of high geochemical background soil heavy metal.Future work in high background areas can focus on the investigation of soil heavy metal background values and environmental benchmark values,enrichment and formation mechanisms,potential activation and migration,risk assessment and control technologies.关键词
地质高背景/土壤/重金属/成因机制/风险管控/文献计量Key words
High geological background/Soil/Heavy metal/Formation mechanisms/Risk control/Bibliometric分类
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胡鹏杰,詹娟,刘娟,李欣阳,杜彦锫,吴龙华,骆永明..土壤重金属地质高背景成因、风险与管控研究进展[J].土壤学报,2023,60(5):1363-1377,15.基金项目
国家自然科学基金项目(U2002210)资助 Supported by the National Natural Science Foundation of China(No.U2002210) （U2002210）
