南极菲尔德斯半岛水生植物的生物地球化学特征研究  

Biogeochemical Characteristics of Aquatic Plant in Fields Peninsula,Antarctic

作　　者：李小梅[1] 赵俊琳[2] 沙晋明[3] 毛雪瑛[4] 李世红[4] 

机构地区：[1]福建师范大学环境科学研究所,福州350007 [2]北京师范大学环境科学研究所环境模拟与污染控制国家重点联合实验室,北京100875 [3]福建师范大学地理学院,福州350007 [4]中国科学院高能物理研究所应用部,北京100080

出　　处：《生态学报》2002年第12期2111-2115,共5页Acta Ecologica Sinica

基　　金：国家"九五"重点科技攻关资助项目 (98-92 7-0 1 -0 4) ;福建师范大学博士基金资助项目

摘　　要：利用中子活化分析技术 ,得到南极西湖沉积岩芯中水生植物 (镰刀藓 )的 2 2种化学元素含量 ,发现南极水生植物的地球化学元素含量范围变化较大 ,而且在沉积层次上 ,各个元素的变异系数也较大。水生植物吸收和累积元素的特征为 :稀土元素、U、As极容易为植物吸收同化 ,Ca、Co、Sc为水生植物容易吸收的元素 ,Th、Hf、Na为水生植物难以同化的元素。同时 ,研究发现水生植物的直接营养物源为湖水中的可溶性离子 ;对水生植物的 2 2种化学元素进行聚类分析 ,发现稀土元素、Ca、Zn、U之间、As、Fe、Co之间共生关系密切 ,对水生植物具有相似的生理作用。Amblystegiaceae, Drepanocladus aduncus (moss) was the main species of plants growing in Xihu Lake, Chinese Antarctica Great Wall Station. Through Neutron Activation Analysis(NAA), the contents of 22 chemical elements in the plant samples are measured respectively. Based on the results, the biogeochemical features including elements contents, accumulation, relationship and nutrient source are discussed in the paper. Xihu lake core was 1 46 meters long, collected by Professor Zhao Junlin joining the 15th China Science Survey Team to Antarctic in 1998~1999. The core was directly picked into PVC tube with 12cm diameter and reserved under freezing condition. After describing the outward features of the core, the core was divided into samples at 1cm intervals. Under the super clean condition, the plant remains were selected out of the sediment samples with plastic tweezers. Then the plant samples were repeatedly washed in clean water and alcohol solution with different concentrations for getting rid of mud particles. Finally, the clean plant samples were analyzed with NAA technology by collaborators in the Institute of High Energy Application, Chinese Academy of Science. The average content of chemical elements in order of abundance in the plant samples is:Fe>Ca>Na>Sr>Ba>Nd>Ce>Zn>La>As>Sc>Co>Cr>Sm>Yb>Eu>Tb>U>Lu>Hf>Sb>Th.The contents range of the abundant elements such as Fe、Ca、Na is 745 83mg/kg(2 67%); The middle abundant element Sr, its average content is 109 33mg/kg,while Ba is only 50 35mg/kg; For the trace elements of Nd、Ce、Zn、La、As、Sc、Co、Cr, their contents range is 10 97~49\^65mg/kg; And the ultramicroelements such as Sm、Yb、Eu、Tb、U、Lu、Hf、Sb、Th, their contents changed in 0\^12~8\^14mg/kg. Meanwhile, It is found that on the vertical section of lake core, contents of chemical elements in plant change greatly, for instance, the variance coefficients of chemical contents are from 21\^1% to 90\^4%.\;After calculating plant enrichment factors of the 22 chemical elements ,

关 键 词：南极 菲尔德斯半岛 水生植物 生物地球化学 特征 

分 类 号：Q948[生物学—植物学]