海南岛西部地区砖红壤中微量元素含量及其分布特征

SPATIAL DISTRIBUTION PATTERN OF TRACE ELEMENTS CONTENTS OF LATOSOL IN THE WEST OF HAINAN ISLAND

对海南岛西部地区发育典型的5个砖红壤剖面微量元素的组成特征进行研究发现,5个剖面微量元素的含量变化趋势具有一定的相似性,其中Cu、Pb、Zn、As平均含量大多高于中国南方砖红壤的平均值,而Ni、Mo、Cd、Sn、Sb等微量元素则刚好相反。各剖面微量元素含量的纵向变化规律显示,土壤中微量元素含量及其垂直变化从根本上取决于土壤母质的特征。受区内自然条件影响,区内土壤微量元素的垂向迁移能力相对较弱,而人类的工业活动、农业活动也可导致少量As、Cd、Pb等有害外源微量元素进入土壤并趋向于在土壤的浅层富集。

The contents of trace elements in different soils derived from five latosol profiles in the west of Hainan Island indicated that the trace elements contents of soils show a similar variation trend. For example, the average contents of Cu, Pb, Zn, As are higher and Ni, Mo, Cd, Sn, Sb are lower than those of latosol soils in South China. The study also indicated that the contents of trace elements in the soils and their variation trend are determined by the parent material of the soils. And although only a little amount of trace elements has undergone vertical migration in the latosol profiles, the contents of trace elements and their spatial variation can be changed. Trace elements in the soils such as As, Cd, Pb can be enriched in the lower layers of the latosol profiles because of the influence of human’s activities.