基于CiteSpace分析近30年土壤重金属阈值研究趋势及热点OA北大核心CSTPCD

The determination of soil heavy metal environmental thresholds is a crucial aspect in establishing soil environmental quality standards.To provide a scientific basis for threshold research,this study employed CiteSpace to analyze the research trends and hotspots of soil heavy metal environmental thresholds over the past 30 years using relevant literature from the Web of Science and CNKI databases.The findings suggested that international research hotspots were focused on"food safety thresholds","ecological safety thresholds","thresholds research objects",and"heavy metal interface processes".However,domestic research hot spots were mainly concentrated on"thresholds derivation","species accumulation pattern",and"environmental capacity models".Ecological safety thresholds,food safety thresholds and human health risk thresholds were mainly derived using the SSD method,empirical regression equation method and target hazard quotient method,respectively.After comparing different heavy metal thresholds and national soil environmental standards,this study found that the ecological safety thresholds and food safety thresholds for soil heavy metals had significant differences in their numerical values,and that environmental quality standards varied significantly among different countries.Compared to the international threshold for heavy metals in soil,domestic research should focus on the interface interaction process of heavy metals and literature data collection.To improve the reliability of various heavy metal environmental thresholds and provide support for the research of environmental capacity and soil environmental quality standards,it is essential to combine big data and machine learning with the research of heavy metal thresholds.