【摘要】 用仪器中子活化法(INAA)对南极菲尔德斯半岛西湖钻孔沉积物和植物残体进行了多元素测定。发现沉积物和植物残体在不同沉积深度分别有相似的元素分布模式;并且二者的元素分布特别是稀土元素分布模式也具有相似性,反映出二者的物源基本相同。植物残体中不同元素的生物富集系数有差异,反映了植物吸收元素的选择性。植物残体中许多元素呈现出明显的规律性变化,初步推测植物残体的元素组合特征对环境变化的响应可能比沉积物更灵敏。更多还原

【Abstract】 The sediments and buried plant remainders from a drilling core in Xihu Lake, Fields Peninsula, Antarctic, were analyzed with instrumental neutron activation analysis method. Data analysis showed that the sediments at different depth had the identical multi-elemental distribution patterns. The same characteristic was also found in the plant remainder samples. Moreover, the sediments and the remainders showed similar multi-elemental distribution patterns including REEs, indicating that they had similar material resources. The elemental enrichment factors were also calculated to differentiate selective uptake of elements by the plant. The depth profiles of many elements of the remainder displayed significant and similarly regular changes. A conclusion can be drawn that the multi-elemental composite characteristics of the plant remainders were more responsive to the environmental changes than those of the sediments, which therefore could provide the important evidence to track the environmental and climatic evolution.更多还原