摘要
土壤中的重金属直接影响农业安全生产,掌握不同耕地和土壤类型中重金属的污染程度可为削减生态风险提供依据。通过实地调查,对云南个旧锡矿区松树脚矿大屯盆地不同耕地和土壤类型的重金属含量,采用单因子指数法、内梅罗综合污染指数法进行污染评价,基于潜在生态危害指数法进行生态风险评价。结果表明,As、Cd、Cu、Cr、Ni、Pb和Zn七种元素中,As和Cd是大屯盆地农田土壤的主要污染因子,两者对污染程度的贡献率为97%,其中Cd的贡献率为68%;两者对生态风险的贡献率为87%。旱地重金属污染程度和生态风险大于水田,红壤中重金属的污染程度和生态风险大于红色石灰土。从空间来看,个旧大屯盆地重金属污染程度总体呈现从西南向东北逐渐降低的趋势。
Heavy metals in the soil body will directly affect the safety of agricultural production, and investigation of the pollution lev-el in different cultivated land types and soil types will provide the basis for the reduction of the above ecological risk. The authors in-vestigated the heavy metal content in different land use and soil types through field work and laboratory analysis. Pollution assessment was conducted using a single factor index and Nemerow pollution index, and ecological risk assessment was also carried out based on potential ecological risk index. The results show that As and Cd are the most important pollution factors among As, Cd, Cu, Cr, Ni, Pb and Zn elements. The contribution of As and Cd to the pollution level is 97%, with the contribution of Cd reaching 68%. The contribution of As and Cd to ecological risk is 87%, with Cd alone contributing 68%. In addition, the pollution level and ecological risk of heavy metals in dry land is greater than those in paddy field, and the pollution level and ecological risk of heavy metals are also greater in red soil than in cerra rossa. Spatially, the pollution level of heavy metals in Datun basin of the Gejiu mining area generally shows a decreasing trend from southwest to northeast.
出处
《地质通报》
CAS
CSCD
北大核心
2014年第8期1253-1259,共7页
Geological Bulletin of China
基金
国土资源部公益性行业科研专项(编号:201111020)
国家自然科学基金项目(批准号:41271479)
关键词
重金属污染
生态风险
评价
土壤类型
锡矿区
heavy metal pollution
ecological risk
assessment
soil type
tin mining area
