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《Journal of Nanjing Normal University(Natural Science Edition)》 2015-03
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Heavy Metal Distribution and Potential Ecological Risks in Flowers Growing Areas of Dounan,Yunnan

Zhao Lingyu;Yang Hao;Wang Yanhua;Wang Hong;Xie Biao;Wang Dan;Xu Meina;School of Geography Science,Nanjing Normal University;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application;  
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 absorption 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 combine 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 predominantly 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.
【Fund】: 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(KYZZ_0214)
【CateGory Index】: X82
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