INAA研究南极菲尔德斯半岛西湖沉积物和植物残体的生物地球化学特征  

Biogeochemical study of the sediments and plant remainders of Xihu Lake, Fields Peninsula, Antarctic with INAA

作　　者：李世红[1] 李小梅[2] 毛雪瑛[1] 徐殿斗[1] 欧阳宏[1] 赵俊琳[2] 柴之芳[1] 

机构地区：[1]中国科学院高能物理研究所核分析实验室,北京100049 [2]北京师范大学环境科学研究所,北京100875

出　　处：《核技术》2005年第4期263-268,共6页Nuclear Techniques

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。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.

关 键 词：沉积物 植物残体 仪器中子活化法 生物地球化学 

分 类 号：P593[天文地球—地球化学] P595[天文地球—地质学]