广州市郊区农业土壤重金属含量特征

The heavy metal content character of agriculture soil in Guangzhou suburbs.

调查了广州市郊区(海珠区、天河区、黄埔区、芳村区、白云区)农业土壤重金属的含量,分析测定了Cu、Pb、Zn、Cr、Ni、Cd、As和Hg 8种重金属元素的全量和有效态含量.结果表明,广州郊区土壤中Hg和Cd的污染程度较大,Pb和Zn次之;Cd元素的有效性系数最高,Hg元素的有效性系数最低;广州5郊区中白云区土壤重金属元素的全量和有效态含量最低;8种重金属元素的有效态均与其全量呈正相关;污水灌溉、固体废物和农药的影响是广州市郊土壤重金属含量较高的主要原因.

The state of heavy metal content of agriculture soil in Guangzhou suburbs (Haizhu District, Tianhe District, Huangpu District, Fangcun District, Baiyun District) was investigated, the total content and available content of 8 heavy metal elements (Cu, Pb, Zn, Cr, Ni, Cd, As and Hg) were analyzed and meatured. The pollution degrees of Hg and Cd were greater, those of Pb and Zn were the next; the valid coefficient of Cd element was the greatest, and that of Hg element was the smallest; total and available contents of heavy metal elements in Baiyun District of Guangzhou suburbs were the smallest of their distribution in five suburbs there existed positive correlativity between available content and total content of eight heavy metals; the effects of polluted water irrigation, solid waste and pesticide were the main reasons of greater heavy metal content in the soil of Guangzhou suburbs.