莆田市郊区蔬菜地土壤重金属分布特征研究

对莆田市郊区蔬菜地土壤中pH值和有机质、Pb、Cd、Cr、Ni、Cu、Zn的含量进行了测定,结果表明,莆田市郊区蔬菜地土壤重金属含量在地区内及地区间的差异较大,Ni、Cu平均含量以新度镇较高,Pb、Cd平均含量以镇海、拱辰办较高,Cr、Zn平均含量以黄石镇较高,各地区重金属元素受地区影响显著性排序为Zn>Cr>Cd>Pb>Cu>Ni。相关性分析表明,莆田市郊区蔬菜地土壤中部分重金属元素以及有机质间存在一定的相关性。所有样本中6种重金属均没有超过GB15618-1995二级标准值,但与福建省水稻土背景值比较,均有不同程度超背景值现象,其中Cr、Cu、Ni超背景值率较高,富集较明显。

Studying of Distribution of Heavy Metal in Vegetable Farm Soil in the Suburb of Putian City

The contents of organic materials,Pb,Cd,Cr,Ni,Cu,Zn and pH in the areas of vegetable farm soil in the suburb of Putian city were inverstigated.Results showed that the contents of heavy metals varied largely in the region and between the regions.The average contents of Ni and Cu are higher in Xin du town,Pb and Cd are higher in Zhen Hai and Gong Chen town,Cr and Zn are higher in the areas of vegetable farm soil in Huang Shi town.Effected by region,it is in order of Zn>Cr>Cd>Pb>Cu>Ni.The heavy metals and organic appear a correlation in the areas of vegetable farm soil in the suburb of Putian city.The concentration of six heavy metals of all soil samples are all less than Grade II Criterion of GB 15618-1995.Compared with the paddy rice soil background in Fujian,six kinds of heavy metals chemical elements all appear super the background value in a different degree.The rate of super the background value for Cr,Cu and Ni are higher than others,and rich gather is obviously.