南京师大学报（自然科学版）Issue(3)：91-98,8.
云南斗南蔬菜地重金属分布及潜在生态风险评价
Heavy Metal Distribution and Potential Ecological Risks in Flowers Growing Areas of Dounan,Yunnan
摘要
Abstract
Soil samples of the plough layer were collected from Dounan where grows lots of flowers and vegetables,the accumulation and chemical forms of heavy metals in soil(Cd,Cu,Pb,Cr,Zn)were determined by AAS(atomic absorp⁃tion spectrophotometer). The potential ecological risks were discussed on the basis of those data we conducted in the study area. And the most important is to explore the influence of physical and chemical properties of topsoil on heavy metals. The results showed that average concentrations of lead in soil are below the average of the background value , while the contents of Cu and Cd are higher than China agriculture quality standard. Its sources were analyzed by com⁃bine principal component analysis with the development of local situation,the accumulation of Zn,Cd,Cr mainly comes from the application of excessive fertilizer;Cu is probably from industrial waste emissions. Zn,Cu,Cr and Pb have lower partitioning levels in the exchange fraction,so they have a low risk of further dispersion to environment. Cd was predomi⁃nantly dominated by the exchange and the reducible fractions,leading to higher mobility and biotoxicity. Cd in the plough layer of soil was the main heavy metal pollution in the study area,since the extent of Cd pollution was moderate and the ecological risk was extremely strong. The adding of nutrient in the cultivation cause the accumulation of heavy metal in soil,increasing the bioactivity of Cd and the toxicity on crops.关键词
斗南/土壤/重金属/化学形态/生态风险Key words
Dounan/soil/heavy metal/chemical speciation/ecological risk分类
资源环境引用本文复制引用
赵凌宇,杨浩,王延华,王红,谢标,王丹,徐美娜..云南斗南蔬菜地重金属分布及潜在生态风险评价[J].南京师大学报（自然科学版）,2015,(3):91-98,8.基金项目
国家自然科学基金（41273102、41030751）、江苏省普通高校研究生科研创新计划项目 （）
