globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1773
论文题名:
High rates of microbial carbon turnover in sediments in the deepest oceanic trench on Earth
作者: Glud R.N.; Wenzhöfer F.; Middelboe M.; Oguri K.; Turnewitsch R.; Canfield D.E.; Kitazato H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:4
起始页码: 284
结束页码: 288
语种: 英语
Scopus关键词: carbon ; carbon cycle ; concentration (composition) ; decomposition ; deep-sea sediment ; Earth science ; marine sediment ; microbial activity ; organic carbon ; oxygen ; pressure effect ; sediment analysis ; sediment chemistry ; trench ; water depth ; Mariana Trench ; Pacific Ocean
英文摘要: Microbes control the decomposition of organic matter inmarine sediments. Decomposition, in turn, contributes to oceanic nutrient regeneration and influences the preservation of organic carbon. Generally, rates of benthic decomposition decline with increasing water depth, although given the vast extent of the abyss, deep-sea sediments are quantitatively important for the global carbon cycle. However, the deepest regions of the ocean have remained virtually unexplored. Here, we present observations of microbial activity in sediments at Challenger Deep in the Mariana Trench in the central west Pacific, which at almost 11,000 m depth represents the deepest oceanic site on Earth. We used an autonomous micro-profiling system to assess benthic oxygen consumption rates. We show that although the presence of macrofauna is restricted at Challenger Deep, rates of biological consumption of oxygen are high, exceeding rates at a nearby 6,000-m-deep site by a factor of two. Consistently, analyses of sediments collected from the two sites reveal higher concentrations of microbial cells at Challenger Deep. Furthermore, analyses of sediment 210 Pb profiles reveal relatively high sediment deposition in the trench. We conclude that the elevated deposition of organic matter at Challenger Deep maintains intensified microbial activity at the extreme pressures that characterize this environment. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106819
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: University of Southern Denmark, Nordic Centre for Earth Evolution, 5230 Odense M, Denmark; Scottish Association for Marine Science, Scottish Marine Institute, Oban PA37 1QA, United Kingdom; Greenland Climate Research Centre, 3900 Nuuk, Greenland; Max Planck Institute for Marine Microbiology, 28359 Bremen, Germany; Alfred-Wegener-Institute for Polar and Marine Research, 27570 Bremerhaven, Germany; University of Copenhagen, Marine Biological Section, 3000 Helsingør, Denmark; Japan Agency for Marine-Earth Science and Technology, Institute of Biogeosciences, Yokosuka, Kanagawa 237-0061, Japan

Recommended Citation:
Glud R.N.,Wenzhöfer F.,Middelboe M.,et al. High rates of microbial carbon turnover in sediments in the deepest oceanic trench on Earth[J]. Nature Geoscience,2013-01-01,6(4)
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