标题:
多元统计法解析县域外源性土壤重金属—以尤溪县为例Multivariate Statistical Methods to Resolve County Exogenous Heavy Metals in Soil—A Case Study in Youxi County
作者:
赵汝荣
关键字:
重金属风险, 克里格插值, 重金属来源解析, 尤溪县Heavy Metal Risks, Kriging, Heavy Metal Source Analyze, Youxi County
期刊名称:
《Advances in Geosciences》, Vol.4 No.4, 2014-08-28
摘要:
本文选择尤溪县联合乡和梅仙镇为关键研究区，采用多元统计和地质统计分析，研究区土壤重金属的主要来源及与土地利用、成土母质之间的关系。结果表明：As、Cd、Cr、Cu、Cd、Hg、Pb、Zn的平均值均高于背景值，尤其是Cd、Pb的含量分别为背景值的264、12.25倍，土壤中重金属累积较为明显。7种元素可被辩识出4个主成分In：I1(Cu、Cd、Pb、Zn)为自然源因子、I2(Cd、Cr、Zn)为工农业及交通源因子、I3(As、Cu、Hg)为农业源因子和I4(Pb、Zn、Cu)为工业源因子。其中Pb、Zn在I1和I4上均有较大载荷，受地质背景和人类活动的共同控制。This paper chose Lianhe Town and Meixian Town as the key research areas in Youxi County. Mul-tivariate statistical and geostatistical analysis were used to reveal the major source of heavy metals, and the relationship between heavy metals and land use, heavy metals and soil parent material. The results showed that: the mean value of As, Cd, Cr, Cu, Cd, Hg, Pb, Zn was higher than the background value; in particular content of Cd, Pb was 264, 12.25 times the background value re-spectively, and the accumulation of heavy metals in soil was more significant. Seven kinds of ele-ments can be identified as four main components In: I1 (Cu, Cd, Pb, Zn) is natural source factors; I2 (Cd, Cr, Zn) is industrial and agricultural source and transport factors; I3 (As, Cu, Hg) is agricultural source factors; and I4 (Pb, Zn) is industrial source factors. Pb and Zn have a larger load on I1 and I4, controlled by geological background and human activity jointly.