蓝细菌和浮游古菌在南海第四纪氮循环中的作用初探
A PRELIMINARY STUDY ON THE ROLE OF CYANOBACTERIA AND ARCHAEA ON THE GLACIAL-INTERGLACIAL NITROGEN CYCLE IN THE SOUTH CHINA SEA
查看参考文献29篇
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文摘
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南海晚第四纪沉积物中的氮同位素在冰期-间冰期气候旋回中只有微弱的变化,与东太平洋的反硝化记录截然不同,可能反应了局地的氮生物地球化学过程。文章对位于南海南部钻取的一根柱状样MD05-2897的海洋氧同位素阶段(MIS)3~5期的有机氮同位素、反映蓝细菌贡献的2-甲基藿烷指数和反映氨氧化古菌Thaumarchaea的泉古菌醇进行了分析。结果显示,有机氮同位素在MIS 5期有明显降低,对应于这一降低,2-甲基藿烷指数和泉古菌醇都显示了升高的特点,暗示蓝细菌固氮作用和古菌氨氧化作用可能是导致OIS 5期的氮同位素降低的重要过程。 |
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其他语种文摘
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Sedimentary δ~(15)N records in the South China Sea(SCS) have been found to vary little during glacial-interglacial cycles,which is quite different from S~(15)N records in the tropical eastern Pacific and may be caused by local nitrogen biogeochemical processes. In this study, we reported downcore results of sedimentary δ~(15)N,2-methyl hopanoid index, and crenarchaeol during the period from marine isotope stage(MIS) 3 to 5 from a site in the southern SCS. The sediment core MD05-2897 is located at 08°49.53'N,111°26.51'E and with a water depth of 1658m. Sediments are calcarious and silicious silty clay with no turbidite. The upper part of the core covering a history since MIS 2 was lost. Samples were lcm thick and were collected every 12cm downcore from 0 to 9.6m depth. The δ~(15)N ranged between 3.6‰ and 5.7‰, with lower values during MIS 5. Corresponding to the lower values during MIS 5, 2-methyl hopanoid index and crenarchaeol exhibited higher values, suggesting that enhanced cyanobacterial N2 fixation(indicated by 2-methyl hopanoid index) and archaeal ammonia oxidation (indicated by crenarchaeol) might be responsible for the δ~(15)N lowering during interglacial times. |
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来源
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第四纪研究
,2013,33(1):34-38 【核心库】
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关键词
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氮同位素
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蓝细菌
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浮游古菌
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南海
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地址
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1.
中国科学院广州地球化学研究所, 中国科学院边缘海地质重点实验室, 广州, 510640
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同济大学, 海洋地质国家重点实验室, 上海, 200092
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-7410 |
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学科
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地质学;植物学 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:4756070
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