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蓝细菌和浮游古菌在南海第四纪氮循环中的作用初探

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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

作者: 李志阳张杰翦知湣贾国东

作者: Li ZhiyangZhang JieJian ZhiminJia Guodong
来源出版物: 第四纪研究  卷: 33   期: 1   页: 34-38   文献号: 1001-7410(2013)33:1<34:LXJHFY>2.0.TX;2-3   出版年: 2013   
来源出版物: Quaternary Sciences  卷: 33   期: 1   页: 34-38   文献号: 1001-7410(2013)33:1<34:LXJHFY>2.0.TX;2-3   出版年: 2013   
摘要: 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。
摘要: Sedimentary delta~(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 delta~(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 delta~(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 delta~(15)N lowering during interglacial times.
入藏号: CSCD:4756070
文献类型: Article
语种: Chinese
作者关键词: 氮同位素; 蓝细菌; 浮游古菌; 南海
作者关键词: nitrogen isotope; cyanobacteria; archaea; South China Sea

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