福建沿海地区不同区域稻田土壤重金属元素富集特征与环境质量评价

通过调查福建沿海地区不同区域的水稻田土壤重金属元素Hg、Cd、Pb污染富集现状,采集样品195件,采用单因子指数、地质累积指数以及内梅罗综合污染指数对土壤环境质量进行评价。结果表明,福建沿海各区域水稻田土壤均有不同程度的重金属富集污染。单项污染指数评价结果显示,Hg分4级,分别是安全等级、警戒线级、轻污染级和中度污染级;Pb全部为安全等级;Cd分2级,分别是安全级和警戒线级。Hg的地质累积指数分3级,分别是轻污染级、中度污染级和中强度污染级;Pb全部为轻污染级;Cd分2级,轻污染级和中度污染级。内梅罗综合污染指数评价结果为安全级有5个地区,警戒线级有3个地区,轻污染等级2个地区。地质累积指数评价结果与单因子污染指数评价结果有明显差异。调查区域土壤环境质量评价为Cd、Pb平均值未超出国家《土壤环境质量标准》(GB 15618—1995)Ⅱ级标准,Hg有40%地区超标。福建沿海地区土壤重金属污染具有中等到高的生态风险。

Fujian Coastal Areas in Different Regions of Paddy Soil Heavy Metal Elements Enrichment Characteristics and Assessment of Environmental Quality

In this paper, through the investigation of different area of Fujian coastal regions of paddy soil heavy metal elements Hg, Cd, Pb pollution enrichment situation, collecting 195 samples, using single factor index and the index of geoaccumulation and Nemero comprehensive pollution index of soil environmental quality evaluation.The results showed that: Fujian coastal region paddy soil have different levels of heavy metal pollution.Individual pollution index evaluation results: Hg 4 grade, respectively is the security level, line level, light pollution and pollution level; Pb is the level of security; Cd 2 grade, respectively is the security level and cordon level.The Hg index of geoaccumulation 3 grade, respectively is the mild pollution level, moderate pollution level and intensity of pollution level; all Pb light pollution level; Cd 2 grade, light pollution level and moderate pollution level.Nemero comprehensive pollution index assessment results for the security level of 5 areas, cordon level there are 3 regions, light pollution grade 2 regions.Geological accumulation pollution index assessment results with single factor pollution index evaluation results have obvious difference.Survey of regional soil environment quality evaluation for the Cd, Pb average value does not exceed the national standard of soil environmental quality of two standard, Hg 40% area exceed the standard.Fujian coastal area soil heavy metal pollution have moderate to high ecological risk.