摘要
通过测定辽河口三道沟和笔架岭光滩、碱蓬(Suaeda salsa)沼泽和芦苇(Phragmites australis)沼泽土壤汞和砷含量,分析了辽河口不同类型湿地土壤汞和砷的垂直分布规律,并进行了风险评价。研究结果表明,2015年11月3日和2016年5月16日,三道沟湿地土壤汞和砷平均质量比分别为0.038 mg/kg和9.13 mg/kg;笔架岭湿地土壤汞和砷平均质量比分别为0.059 mg/kg和10.77 mg/kg。三道沟各类型土壤汞和砷含量明显低于笔架岭。笔架岭的芦苇沼泽和碱蓬沼泽土壤汞含量从表层向下逐渐增大,芦苇沼泽土壤砷含量从表层向下逐渐减小,而光滩和碱蓬沼泽0~10 cm深度土壤砷含量总体由表层向下逐渐减小。三道沟和笔架岭各类型湿地土壤汞和砷的I_(geo)指数都为负数,污染等级都是清洁;潜在生态风险指数结果表明,三道沟和笔架岭湿地土壤汞和砷的潜在生态风险较低。
The content of total mercury and arsenic in the wetland soils of mudflats, Suaeda salsa and Phragmites australis marshes in Liaohe estuary（two sites： Sandaogou and Bijialing） were determined to analysis the distribution characteristics of mercury and arsenic and their ecological risk. The results showed that the average contents of total mercury and arsenic were 0.038 mg/kg and 9.13 mg/kg in the soil of Sandaogou, and the average contents were 0.059 mg/kg and 10.77 mg/kg in the soil of Bijialing. The concentrations of total mercury and arsenic were significantly lower in the soils of Sandaogou than those of Bijialing. The concentration of mercury gradually increased from the surface soil layer to the deep soil layer in Phragmites australis and Suaeda salsa marshes. The concentration of arsenic gradually decreased from the surface soil layer to the deep soil layer in Phragmites marshes. The concentration of arsenic gradually decreased from second soil layer to deep soil layer in mudflats and Suaeda salsa marshes. All of the Igeo were negative number in different types of wetlands in Sandaogou and Bijialing, and the pollution of mercury and arsenic were clean level. Potential ecological risk index showed that total mercury and arsenic contamination had a low ecological risk in wetland soil of Sandaogou and Bijialing.
出处
《湿地科学》
CSCD
北大核心
2017年第4期556-561,共6页
Wetland Science
基金
国家自然科学基金项目(41571085和31300444)
沈阳大学研究生创新项目(sdycxz2015046)资助
关键词
砷
汞
分布
风险评价
河口湿地土壤
mercury
arsenic
distribution
risk assessment
estuary wetland soil
