重庆市不同功能区绿地土壤Hg分布特征及其污染评价  

Distribution Characters and Pollution Evaluation of Hg in Urban Soil of Different Functional Area in Chongqing

作　　者：徐福银 胡艳燕 包兵 陈祥 

机构地区：[1]重庆市风景园林科学研究院,重庆401329 [2]重庆市城市园林绿化工程技术研究中心,重庆401329

出　　处：《土壤通报》2015年第5期1253-1258,共6页Chinese Journal of Soil Science

基　　金：重庆市科技计划项目(cstc2011pt-gc80019);重庆市科技研发基地建设计划(cstc2014gjhz20001);国家国际科技合作专项项目(2015DFR70390);重庆市集成示范计划项目(cstc2013jcsf20003)资助

摘　　要：通过对重庆市居住区、公园、商业区和交通区等不同功能区绿地土壤重金属Hg的分析,讨论了绿地建成时间、土壤理化性质等不同因子对土壤重金属Hg的影响。重庆市不同功能区土壤重金属Hg平均含量均低于国家土壤环境质量二级标准,土壤Hg污染较轻。但82.89%的调查样点土壤汞含量超过当地土壤背景值,表明该市大部分区域存在外源汞的影响。总体上,居住区和公园绿地土壤Hg污染不明显;但交通区绿地土壤重金属Hg污染较为严重。地质累积指数表明,重庆市34.21%的区域土壤未出现汞的明显污染,65.79%的绿地土壤已有不同程度的Hg污染。研究发现,调查区域绿地土壤中,建成时间对重金属Hg含量影响最大,土壤理化性质对Hg影响次之。This research investigated Hg distribution characteristic in urban soil of different functional areasincluding resident area, parks, commercial area and traffic area in Chongqing. It also discussed the influence of soil Hg by the completion time of urban soil and the soil physic- chemical properties. Results showed that the average content of Hg wasbelow the national secondary standard of soil environment quality in different functional areas of Chongqing, which indicated the pollution level of Hg was light andthe environment quality of soil Hg overall was good. But Hg content in about 82.89% of sampled soil was more than soil background value of Chongqing City, which indicated the most of urban soil was influenced by extraneous Hg in Chongqing. The quality of urban soil in residential area and park was better overall, but Hg pollution was the most serious in traffic area of urban soil. The geo- accumulation index showed that about 34.21% of sampled soil had no Hg pollution, 65.79% had different degrees of pollution. These results showed that completion time had the greatest impact on Hg content, and then soil physic- chemical properties.

关 键 词：城市土壤 重金属 HG 灰色关联度 污染评价 

分 类 号：X53[环境科学与工程—环境工程] X825