大宝山矿山下游地区稻田土壤重金属含量特征

Characteristics of Cd,Zn,Pb,Cu Content of Paddy Soils in the Lower Stream of Dabaoshan Area,Guangdong

通过现场采样及室内测试,研究了广东大宝山矿山下游地区稻田土壤重金属Cd、Zn、Pb、Cu的总量及有效态含量。结果表明,该地区稻田土壤污染是Cd和Cu为主的多金属复合污染,稻田土壤Cd、Zn、Pb和Cu总量的平均值分别为2.19、244.94、179.93和287.91 mg.kg-1。4种重金属的有效性系数均较高,Pb有效性系数最高,Zn的有效性系数最低。Cd、Zn、Pb、Cu总量与其有效态含量之间极显著相关(P<0.01)。土壤pH值对Cd、Zn、Pb、Cu的总量及有效态含量影响不大,相关性不显著。土壤有机质含量与Zn和Cu总量和有效态含量呈显著正相关关系(P<0.05)。

21 samples were collected from heavy metal contaminated paddy soil to analyze soil properties, total contents and available part of Cd, Zn, Pb, and Cu in the lower stream of Dabaoshan mine area, Guangdong Province. The results indicate that the most important contaminants in the paddy soils in the lower stream of Dabaoshan mine area are Cd and Cu related multi-metal compounds. The average total contents of Cd, Zn, Pb and Cu in 21 samples are 2. 19, 244.94, 179. 93 and 287. 91 mg/kg, respectively. The coefficients of available parts to total contents of Cd, Zn, Pb and Cu are high, and the coefficient of Pb element is the biggest, and that of Zn element is the smallest. There are significant correlations between total and available contents of the four heavy metals （P 〈 0.01 ）. In addition, the effects of pH on total and available contents of Cd, Zn, Pb, and Cu are not significant. Organic matter contents are positively associated with total and available contents of Zn and Cu （P 〈 0.05 ）.