海南省农用地土壤重金属含量与土壤有机质及pH的相关性

研究了海南省农用地土壤有机质含量、pH值和土壤中重金属含量,并对其相关关系进行了分析.结果表明:海南省农用地土壤有机质含量总体上处于中等水平,全省有机质平均含量为22.99 g/kg,各地区之间含量差异较大,土壤pH平均值为5.20;5种重金属元素含量的平均值均未超过<国家土壤环境质量标准>(GB156182-1995)二级标准限值.但研究区土壤中Hg、Cd、Cr 3种重金属元素含量的最大值均超过了国家土壤环境质量的二级标准,并分别达到了1.63、0.64、586.70 mg/kg:土壤重金属含量与土壤性质间的关系复杂:有机质含量与Hg、Cd、Cr含量呈极显著正相关,与Pb含量呈显著相关,而pH与Hg、Cr呈负相关,与Cd、Pb呈显著正相关.

Correlation Between Heavy Metal Pollution and Basic Properties of Agricultural Soils in Hainan Province

Soil organic matter contents, pH values and heavy metal contents of agriculture soils in Hainan were studied to disclose their correlationships. Results showed that organic matter contents of almost all soils were at middle or low levels with a mean of 22.99%, significantly different in space; that the mean pH value was 5.20, and the mean contents of five heavy metals all were not higher than the 2nd grade in the national soil environmental quality standard, but the max contents of Hg, Cd and Cr exceeded it, the concentrations of Hg, Cd and Cr being 1.63, 0.64 and 586.70 mg/kg, respectively. The relationships between soil heavy metals and soil organic matter contents and pH were complicated.