海南岛东部地区砖红壤中微量元素含量的纵向分异研究

Vertical distribution pattern of trace element contents of Latosol in the eastern areas of Hainan Island

对海南岛东部地区发育典型的6个砖红壤剖面的微量元素的组成特征及其纵向变化规律进行研究发现,土壤母质是决定砖红壤微量元素含量的主要原因,区内花岗岩砖红壤中Cu、Sr、Zn、Pb含量明显高于砂页岩砖红壤,而砂页岩砖红壤中的As含量相对较高.砂页岩砖红壤剖面中的微量元素含量的纵向变化规律具有相似性,并显示出B层>C层>A层的特征,而花岗岩砖红壤微量元素在各层中的纵向分异规律不甚明显.区内的人类活动对海南岛东部砖红壤剖面中的部分微量元素的分布具有一定的影响,农药及老鼠药的大量使用,可致使大量的As元素进入土壤表层富集,并造成土壤中As含量超标,成为区内环境的重要隐患.

The study on the content features of the trace elements of different soils derived from six latosol profiles in the eastern areas of Hainan Island indicated that the contents of the trace elements of the soils and their change tendency are determined by the parent material of the soils. For example, the average contents of Cu,Sr,Zn ,Pb in granitoid latosol soils are higher than those of the latosol soils which are developed from sandstone and shale. The study also indicated that the trace element con- tents of the soils have a similar vertical change tendency in latosol soils of sandstone and shale, i.e., the contents of the trace elements in layer A ,layer B and layer C have a law of layer A〉 layer B 〉 layer C. On the other hand, the vertical changes are not clear in granitoid latosol profiles. The trace elements of the soils such as As can be enriched in the lower layer of the latosol profiles because of human activities.