海南岛东西部砖红壤中重金属元素含量空间分布特征及其相关性研究

目的]对海南岛东西部砖红壤中重金属元素含量空间分布特征及其相关性进行研究。方法]采用现场采样及室内分析测试的方法,在海南岛东、西部各取6个土壤剖面,共35个土壤样本,对砖红壤土壤剖面中7种重金属元素的含量特征进行分析,研究不同地区砖红壤剖面重金属元素含量的空间分布特征,并分析东、西部表层土壤各种重金属之间的相关性。结果]土壤中重金属元素含量及其分布规律从很大程度上取决于土壤母质的特征;除镍元素外,大部分重金属元素在各层中的均值高于中国南方砖红壤平均值,有一部分重金属元素在淀积层积累;另外,人类活动对海南岛砖红壤剖面中的重金属元素可产生一定影响;海南东、西部表层土壤各种重金属之间的相关性分析结果表明,铅和铜,铬和镍,铬和锌之间显著相关,这些重金属来自同源的概率更大。结论]该研究结果为海南岛砖红壤重金属污染风险评估奠定了基础。

Study on the Spatial Distribution and Relationship of Heavy Metal Elements of Latosol in Eastern and Western of Hainan Island

Objective] To study the spatial distribution and relationship of heavy metal elements(HMEs) of latosol in eastern and western of Hainan Island.Method] Taking the latosol of Hainan Island as research areas,and using on-site sampling and laboratory analysis testing methods,the content and the spatial distribution characteristics of 7 HMEs in 35 soil samples which were derived from 12 latosol profiles in both the East and West areas were studied.Result] The results indicated that content range of HMEs in both eluvial horizons and illuvial horizons had a positive correlation with the content range in parent material horizons.For most of HMEs except Ni,the contents of HMEs in different horizons were lower than its average contents in the southern latosol of the China.Part of the heavy metal element was accumulated in the deposition layer.Heavy elements in the soils can be enriched in the latosol profiles because of the influence of human's activities.Cr and Ni,Cr and Zn also had positive significant relationships,so the results showed that theses HMEs in latosol of Hainan Island have the same source of pollution.Conclusion] These primary research results might provide the basis for the risk assessment of heavy metal contamination of latosol in eastern and western of Hainan Island.