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中国沙漠 ›› 2004, Vol. 24 ›› Issue (6): 685-688.

• 研究论文 • 上一篇    下一篇

洛川黄土剖面中矿物固定态铵的分布

饶文波1,2, 李晓彪1, 高振敏1, 罗泰义1   

  1. 1. 中国科学院 地球化学研究所, 贵州 贵阳 550002;
    2. 中国科学院 研究生院, 北京 100039
  • 收稿日期:2003-05-08 修回日期:2003-06-06 出版日期:2004-12-20 发布日期:2004-12-20
  • 作者简介:饶文波(1973-),男(汉族),湖南祁阳人,博士,主要从事地球化学研究工作。E-mail:raowenbo@163.com
  • 基金资助:
    国家自然科学基金(49902024)资助

Distribution of Fixed-NH4+-N in Luochuan Loess Section

RAO Wen-bo1,2, LI Xiao-biao1, GAO Zhen-min1, LUO Tai-yi1   

  1. 1. The State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
    2. The Graduate School, Chinese Academy of Sciences, Beijing 100039, China
  • Received:2003-05-08 Revised:2003-06-06 Online:2004-12-20 Published:2004-12-20

摘要: 对洛川黄土中的固定铵进行了初步分析。结果表明, 在所测定的黄土-古土壤层中, 固定铵态氮含量在130~210μg·g-1之间变化。黄土中的固定铵态氮含量明显低于古土壤。13万a以来洛川黄土剖面中固定铵的分布呈现三次大的低-高值的振荡特征, 即末次间冰期S1古土壤中固定铵态氮含量最高, 其次为冰后期的S0古土壤层, 末次冰期形成的马兰黄土中固定铵态氮含量最低; 在马兰黄土中同样体现出三次小的低-高值的波动特征。黄土与μm组分的分布具有相似性, 这些特征反映了洛川黄土中固定铵态氮的含量变化与气互层的古土壤中固定态铵的分布与黄土高原区气候的冷暖变化有较好的一致性, 并且13万a以来洛川黄土剖面中固定铵的分布与磁化率和<2μm候条件有紧密的联系, 揭示了黄土中固定铵的变化在一定程度上能指示黄土高原区古气候的演变。

关键词: 洛川黄土, 固定铵, 古气候

Abstract: Fixed-NH4+-N content varies between 120 μg·g-1 and 202 μg·g-1 in Luochuan loess-palaeosol sequences. Fixed-NH4+-N content in interbeded palaeosols is higher than that of the loess. There are three big fluctuations in values of fixed NH4+-N content in the Luochuan loess section during the last 130 ka. Fixed-NH4+-N content is the highest in the S1 palaeosoil developed in the last interglacial period. Secondly, fixed-NH4+-N content is slightly lower in the S0 layer formed in the post-glacial period. Thirdly, fixed-NH4+-N content is the lowest in Malan loess formed in the last glacial period. In addition, there are three small oscillations in the values of fixed-NH4+-N content in the Malan loess. The curve of fixed-NH4+-N in the loess and interbeded paleosols much corresponds to climate variation in the Chinese Loess Plateau. The curve of fixed-NH4+-N exhibits a similar oscillation in amplitude and in frequency with that of magnetic susceptibility and the <2 μm fraction in the S0L1S1 sequence. These characteristics show that fixed-NH4+-N is closely related to climate conditions, and further reveal that fixed-NH4+-N in the Luochuan loess section can record the information of climate change to some degree.

Key words: Luochuan loess, fixed-NH4+-N, palaeoclimate

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