广东省典型区域农业土壤中重金属污染空间差异及原因分析  

Spatial Distribution and Sources of Heavy Metal Pollution of Agricultural Soils in the Typical Areas of Guangdong Province,China

作　　者：杨国义[1] 张天彬[1] 万洪富[1] 罗薇[1] 高原雪[1] 

机构地区：[1]广东省生态环境与土壤研究所广东省农业环境综合治理重点实验室,广州510650

出　　处：《土壤》2007年第3期387-392,共6页Soils

基　　金：国家环保总局科技项目(2001-1-2);广东省自然科学基金项目(06025915)资助。

摘　　要：分析了广东东翼(汕头)、西翼(湛江)和珠江三角洲(东莞、惠州、中山和顺德)等典型区域农业土壤中8种重金属(Cu、Zn、Ni、Cr、Pb、Cd、As和Hg)元素的含量。结果表明,578个农业土壤表层样中,有230个样品的重金属含量超过国家土壤环境质量二级标准值,超标率39.79%,Pb没有超标,Ni超标最严重;果园土比水稻土、菜园土污染严重;不同区域的土壤污染程度是珠江三角洲>东翼(汕头)>西翼(湛江),珠江三角洲的西、北江流域(中山、顺德)土壤重金属污染程度要比东江流域(东莞、惠州)严重。人为因素、成土母质和不同流域水质差异是造成广东典型区域农业土壤重金属污染的原因。A soil survey was carried out, covering six regions, one in the east part, one in the west part and four in the Pearl River Delta （PRD） for contents of heavy metals （Cu, Zn, Ni, Cr, Pb, Cd, As and Hg） in agricultural soils. Results showed that 39.79% of the 578 soil samples collected from the top layers of the agricultural land in these regions were found to exceed the criteria for respective heavy metals of GradelI of the national standard for environment quality. Ni was the most serious one while Pb the least or still below the criterion. Orchard soils were more polluted than paddy soils and vegetable soils, and the PRD than the east and west of parts of Guangdong, and the Xijiang and Beijiang River valleys （Zhongshan and Shunde） than the Dongiiang River valley （Dongguan and Huizhou） in the PRD. Human activities, soil parent materials and water quality were major causes of the heavy metal pollution of the agricultural lands in these regions.

关 键 词：广东典型区域 农业土壤 重金属 污染 

分 类 号：X53[环境科学与工程—环境工程]