Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/NGEO2925 |
Microbial formation of labile organic carbon in Antarctic glacial environments | |
Smith, H. J.1,2; Foster, R. A.3,4; McKnight, D. M.5; Lisle, J. T.6; Littmann, S.4; Kuypers, M. M. M.4; Foreman, C. M.1,7 | |
2017-05-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Sweden; Germany |
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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400407000012 |
WOS关键词 | MATTER ; MARINE ; LAKES ; PRODUCTIVITY ; FLUORESCENCE ; CRYOCONITE ; DYNAMICS ; ANCIENT ; VIRUSES ; VALLEY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35167 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Montana State Univ, Ctr Biofilm Engn, Bozeman, MT 59717 USA; 2.Montana State Univ, Land Resources & Environm Sci, Bozeman, MT 59717 USA; 3.Stockholm Univ, Dept Ecol Environm & Plant Sci, S-10691 Stockholm, Sweden; 4.Max Planck Inst Marine Microbiol, Dept Biogeochem, D-28359 Bremen, Germany; 5.Univ Colorado, INSTAAR, Boulder, CO 80309 USA; 6.US Geol Survey, St Petersburg Coastal & Marine Sci Ctr, St Petersburg, FL 33701 USA; 7.Montana State Univ, Chem & Biol Engn, Bozeman, MT 59717 USA |
推荐引用方式 GB/T 7714 | Smith, H. J.,Foster, R. A.,McKnight, D. M.,et al. Microbial formation of labile organic carbon in Antarctic glacial environments[J]. NATURE GEOSCIENCE,2017,10(5). |
APA | Smith, H. J..,Foster, R. A..,McKnight, D. M..,Lisle, J. T..,Littmann, S..,...&Foreman, C. M..(2017).Microbial formation of labile organic carbon in Antarctic glacial environments.NATURE GEOSCIENCE,10(5). |
MLA | Smith, H. J.,et al."Microbial formation of labile organic carbon in Antarctic glacial environments".NATURE GEOSCIENCE 10.5(2017). |
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