globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2925
论文题名:
Microbial formation of labile organic carbon in Antarctic glacial environments
作者: Smith H.J.; Foster R.A.; McKnight D.M.; Lisle J.T.; Littmann S.; Kuypers M.M.M.; Foreman C.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:5
起始页码: 356
结束页码: 359
语种: 英语
Scopus关键词: bacterium ; carbon cycle ; carbon fixation ; glacial environment ; microbial activity ; organic carbon ; primary production ; respiration ; stream ; Antarctica ; Antarctica ; East Antarctica ; McMurdo Dry Valleys ; Bacteria (microorganisms) ; Photobacteria
英文摘要: Roughly six petagrams of organic carbon are stored within ice worldwide. This organic carbon is thought to be of old age and highly bioavailable. Along with storage of ancient and new atmospherically deposited organic carbon, microorganisms may contribute substantially to the glacial organic carbon pool. Models of glacial microbial carbon cycling vary from net respiration to net carbon fixation. Supraglacial streams have not been considered in models although they are amongst the largest ecosystems on most glaciers and are inhabited by diverse microbial communities. Here we investigate the biogeochemical sequence of organic carbon production and uptake in an Antarctic supraglacial stream in the McMurdo Dry Valleys using nanometre-scale secondary ion mass spectrometry, fluorescence spectroscopy, stable isotope analysis and incubation experiments. We find that heterotrophic production relies on highly labile organic carbon freshly derived from photosynthetic bacteria rather than legacy organic carbon. Exudates from primary production were utilized by heterotrophs within 24 h, and supported bacterial growth demands. The tight coupling of microbially released organic carbon and rapid uptake by heterotrophs suggests a dynamic local carbon cycle. Moreover, as temperatures increase there is the potential for positive feedback between glacial melt and microbial transformations of organic carbon. © 2017 Macmillan Publishers Limited, part of Springer Nature. 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/105780
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: Center for Biofilm Engineering, Montana State University, Bozeman, MT, United States; Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, United States; Department of Ecology, Environment, and Plant Sciences, Stockholm University, Stockholm, Sweden; Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen, Germany; INSTAAR, University of Colorado, Boulder, CO, United States; US Geological Survey, St Petersburg Coastal and Marine Science Center, St Petersburg, FL, United States; Chemical and Biological Engineering, Montana State University, Bozeman, MT, United States

Recommended Citation:
Smith H.J.,Foster R.A.,McKnight D.M.,et al. Microbial formation of labile organic carbon in Antarctic glacial environments[J]. Nature Geoscience,2017-01-01,10(5)
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