Abstract:
The latest frontier progress and research hotspots in the remediation of heavy metal pollution in farmland soils at home and abroad were reviewed to summarize the effective remediation and treatment technologies and the practical effects, so as to provide a basis for the safe use of heavy metal-contaminated farmland in China. In this study, COOC and VOSviewer bibliometric tools were used, and the full-text database of China Knowledge Network (CNKI) and Web of Science core collection database (WOS) were used as data retrieval sources to visualize and analyze the knowledge map of relevant literature in the field of remediation and management of heavy metal pollution in agricultural soil fields from 2010 to 2021. The number of domestic and foreign research literature on heavy metal remediation in agricultural soil fields has been growing rapidly during 2010 ~ 2021, and the growth rate of English literature was significantly higher than that of Chinese literature. China is the leading researcher in the field of remediation of heavy metal pollution in agricultural fields (with the highest publication rate of 26.8%) and has contributed the most to the global heavy metal pollution control efforts. The TOP 3 journals of domestic and foreign publishing in this field include:
Journal of Agricultural and Environmental Sciences,
Anhui Agricultural Science,
Journal of Environmental Engineering,
Environmental Science and Pollution Research,
Chemosphere,
Journal of Hazardous Materials. Heavy metals such as cadmium (Cd), lead and arsenic, etc. were attracted much attention from researchers. The research scholars at home and abroad were characterized by "small clusters, big dispersion", and the cooperation needs to be further strengthened. Based on the analysis of keywords, the research hotspots were solidification/stabilization technology and phytoremediation (with a proportion of 80%) in both Chinese and English literature. Taking Cd pollution as an example, the remediation effects of reducing Cd in field trials were included in the low-accumulation crop varieties (the rate of Cd reduction in grains reached 67.9%), inorganic-organic combination (42.7%) and foliar resistance control technology (39.9%). However, it is still necessary to combine them with agronomic measures (e.g. intercropping, water regulation) and microbial fungicides to achieve better field restoration and governance effect.