为了解近30年国内外土壤重金属污染评价领域的研究状况,利用VOSviewer、CiteSpace及HistCite等文献计量工具对Web of Science核心合集数据库中该领域研究结果进行知识图谱分析.结果表明:中国是土壤重金属污染评价研究领域的主要发文国家,该领域研究重点关注健康风险评价、生态风险评价、污染物空间分布、源解析等;常用评价方法为地积累指数、污染指数、基于地理信息系统(GIS)的地统计学评价.其中,地积累指数与污染指数的评价结果受背景值准确性影响较大,基于GIS的地统计学评价方法受限于变量相关性;评价指标呈现从土壤中重金属含量向生物有效性发展的趋势,不同形态重金属的毒性等相关研究仍呈上升趋势;土壤铅、镉的污染评价相关研究最多,近些年对于砷、锌与铜等的污染评价逐渐受到更多关注;源识别、空间分析、生态风险仍将是近期内研究热点.
Research hotspot and evolution of global soil heavy metal contamination assessment from 1991 to 2022
In order to understand the research status of soil heavy metal contamination assessment at home and abroad in the past 30 years,the bibliometric tools such as VOSviewer,CiteSpace and HistCite,were used to analyze the knowledge map of this field based on the core collection database of Web of Science.The results showed that:China was the main literature publishing country in this field,and the research in this field focused on the assessment of pollution characteristics(characteristic pollutants,spatial distribution of pollutants,etc.)and risks(health risk assessment,ecological risk assessment,etc.).The commonly used evaluation methods included the geological accumulation index(Igeo),the pollution index(PI),and the GIS-based geostatistical evaluation(GGE).However,the assessment results of the Igeo and the PI were greatly affected by the accuracy of background values,while the GGE results were limited by the variable correlation.The assessment indexes showed a trend from the content of heavy metals in soil to the bioavailability,and the toxicity research of different forms of heavy metals was still increasing.The contamination assessment of plumbum and cadmium in soil was the most studied,and arsenic,zinc and copper have received more attention in recent years.The source identification,spatial distribution,and ecological risk will remain research hotspots of this field in the near future.
heavy metalsoil contamination assessmentbibliometric analysis
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