摘要
对环洞庭湖区典型蔬菜基地的土壤,按成土母岩母质研究了其重金属污染现状。结果表明:第四纪红土发育的土壤综合污染指数处于警戒线附近,仅Cd出现15%的超标,未受到其他重金属的污染;板页岩与河流冲积物发育的土壤综合污染指数平均为1.14和1.02,均达到轻污染水平,污染元素均为Cd、Cu和Ni,板页岩发育的超标率分别为56%、75%和38%,河流冲积物发育的超标率分别为45%、26%和12%。该区土壤Cd污染比较严重可能是较高的Cd背景值和长期大量施用磷肥带入Cd元素共同造成的;Cu污染可能是长期施用大量粪肥引起的;N i虽然也有超标,但可能并非受到外界污染,而是背景值较高引起的。该区第四纪红土发育的土壤质量较好,宜继续发展蔬菜种植;对河流沉积物和板页岩发育的土壤应注意Cd和Cu的污染。
We surveyed pollution status of heavy metals in soils classified by parent materials for typical vegetables bases around Dongting Lake region. The results showed that the soils derived from Quaternary red clay contain warning limit of heavy metals, and only 15% of the soils are polluted by Cd. However, exceeding official limits of Cd, Cu and Ni account for 56%, 75% and 38% for the total soils that derived from slate shale, and the percentages were 45% , 26% and 12% in soil that derived from alluvial deposit of rivers. The both were in little pollution, with comprehensive pollution indexes of 1.14 and 1.02, respectively. The pollution of Cd in soils may be caused by its highly background and the utilization of superfluous phosphorus fertilizer for decades around Dongting lake region. The use of a large amount of manure may be another origin of Cu pollution in soils. And the over-limit rate of Ni in soils was so high for its high background. In conclusion, quality of the soils derived from the Quaternary red clay was suitable for vegetable, and we should pay attention to the pollution of Cd and Cu in the soils derived from slate shale and alluvial deposit of rivers.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第B03期22-26,共5页
Journal of Agro-Environment Science
基金
中央环境保护专项基金资助项目(<湖南株洲某村土壤重金属污染综合防治与示范>)
关键词
重金属
土壤
污染
评价
环洞庭湖区
heavy metals
soil
pollution
evaluation
Dongting Lake region
