基于文献计量的中国农田土壤重金属污染评价

Evaluation of Heavy Metal Pollution in Farmland Soil of China Based on Bibliometrics

对中国知网和万方数据库中2003至2013年间农田土壤重金属污染的相关文献进行基于文献计量和地理信息技术的农田土壤污染指数时空分布信息挖掘。结果表明:全国农田土壤重金属污染处于轻度污染到中度污染之间,并表现出一定的时空分异规律。湖南、云南两省的农田土壤重金属污染最为严重,东南地区以广东、广西为核心形成高-高聚集。在探讨的几种重金属元素中,污染严重程度依次为Cd>Pb>Cu>As>Cr。Pb、Cd污染较为严重,多与地区矿产资源的开发利用方式有关,应作为优先控制元素。研究成果或成为全国土壤污染状况调查的重要补充,可以促进区域土壤、环境相关研究的开展。

The topic of the heavy metal contamination in the farmland soil of China from 2003 to 2013 in CNKI and Wanfang database wereanalyzed with bibliometric and geographic information technology. The results showed that the national farmland soil suffered from mild to moderate heavy metal pollution with interesting temporal and spatial patterns. Hunan province was the most seriously polluted province, followed by Yunnan province. A high- high spatially clustered pattern was found for Guangdong and Guangxi provinces. Among the heavy metals studied, the degrees of pollution were Cd 〉 Pb 〉 Cu 〉 As 〉 Cr sequentially. Pb and Cd pollution was mostly related to the environmentally unfriendly development and utilization of mineral resources in the South of China, which should be controlled with priority. Our study may be important supplement to the report on the national general survey of soil contamination, and may also promote the regional research of soil and environment.