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引用本文:王雨春,万国江,黄荣贵,尹澄清.红枫湖、百花湖沉积物全氮、可交换态氮和固定铵的赋存特征.湖泊科学,2002,14(4):301-309. DOI:10.18307/2002.0402
WANG Yuchun,WAN Guojiang,YIN Chengqing,HUANG Ronggui.Distribution of Total, Exchangeable and Fixed Nitrogen in the Sediments of Two Lakes in Guizhou Province. J. Lake Sci.2002,14(4):301-309. DOI:10.18307/2002.0402
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红枫湖、百花湖沉积物全氮、可交换态氮和固定铵的赋存特征
王雨春1,2, 万国江1, 黄荣贵2, 尹澄清1
1.中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳550002;2.中国科学院生态环境研究中心水环境化学国家重点实验室, 北京100085
摘要:
氮是引起湖泊水体富营养化的关键营养元素之一.本次工作从贵州两个重要水库(红枫湖和百花湖)采集了未受扰动的沉积物样品柱,分析了分层沉积物样品中的总氮、无机交换性氮和固定铵的含量及垂直剖面分布.研究表明,红枫湖和百花湖沉积物中具有较高的全氮含量,平均含量约为沉积物干重的0.36%~0.40%,其垂直分布在埋藏过程中受到成岩作用改造;沉积物交换性氮在沉积物中的赋存受到全氮含量和埋藏环境的双重控制;红枫湖和百花湖沉积物具有较强的吸持固定铵的能力,沉积物固定铵的绝对含量的平均值分别为434.05 mg/kg和416.94mg/kg;分别占全氮的13.53%和12.53%.
关键词:  沉积物  全氮  交换性氮  固定铵  红枫湖  百花湖
DOI:10.18307/2002.0402
分类号:
基金项目:国家自然科学基金项目(40103008);中国科学院知识创新工程重要方向项目(KZCX2-105);贵州省自然科学基金项目联合资助
Distribution of Total, Exchangeable and Fixed Nitrogen in the Sediments of Two Lakes in Guizhou Province
WANG Yuchun1,2, WAN Guojiang1, YIN Chengqing2, HUANG Ronggui1
1.LState Key Lab. of environment Geochemistry, Institute of Geochemistry, CAS, Guiyang, 550002, P. R. China;2.SKLEAC, Research Center For Eco-Environmental Sciences, CAS, Beijing, 100085, P.R.China
Abstract:
Nitrogen plays a key role in lake eutrophication.We collected several undisturbed sediment corevS from two lakes, Lake Hongfeng and Lake Baihua in Guizhou Province to analyze the concentration and profile distributions of total, exchangeable inorganic and fixed nitrogen.The result's show that: (1) the nitrogen loctcl in the sediments of the two lakewS is higher in comparison with the average of lakes and reservoirs in China.Their average concentration of total nitrogen ranges from 0.36% to 0.40% Cdry sediment weight).It is obviously due to influence of diagenesis on vertical profile of total nitrogen in the sediment.The sediment of the reservoirs may be one of main nitrogen sources to cause the eutrophication.(2) The concentrations of total nitrogen and the burial environmental conditions are two main factors in distribution of the exchangeable nitrogen on sediment cores.(3) The fixed nitrogen is one of major sinks of nitrogen in the two reservoirs sediments.The concentration of fixed nitrogen in Lake Hongfeng and Lake Baihua, 434.05 mg/kg and 416.94mg/kg respectively, is higher than the data reported for others lakes or reservoirs of China.
Key words:  Sediment  Total nitrogen  exchangeable nitrogen  fixed nitrogen  Lake Hong-feng  Lake Baihua
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