globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1683
论文题名:
Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces
作者: Zhu G.; Wang S.; Wang W.; Wang Y.; Zhou L.; Jiang B.; Op Den Camp H.J.M.; Risgaard-Petersen N.; Schwark L.; Peng Y.; Hefting M.M.; Jetten M.S.M.; Yin C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:2
起始页码: 103
结束页码: 107
语种: 英语
Scopus关键词: ammonium ; anoxic conditions ; bacterium ; denitrification ; freshwater ecosystem ; heterotrophy ; isotopic analysis ; lacustrine environment ; nitrogen cycle ; oxidation ; riparian zone ; substrate ; China
英文摘要: For decades, the conversion of organic nitrogen to dinitrogen gas by heterotrophic bacteria, termed heterotrophic denitrification, was assumed to be the main pathway of nitrogen loss in natural ecosystems. Recently, however, autotrophic bacteria have been shown to oxidize ammonium in the absence of oxygen, yielding dinitrogen gas. This process, termed anammox, accounts for over 50% of nitrogen loss in marine ecosystems. However, the significance of anammox in freshwater ecosystems has remained uncertain. Here, we report the occurrence of anammox hotspots at land-freshwater interfaces of lake riparian zones in North China, using molecular and isotopic tracing technologies. Laboratory incubations measuring anammox activity at substrate concentrations no more than 10% of those observed in situ yielded some of the highest potential activities reported for natural environments to date. Potential rates of anammox peaked in sediments sampled from the interface between land and water, as did the abundance of annamox bacteria. Scaling our findings up to the entire lake system, we estimate that interfacial anammox hotspots account for the loss of 103 g Nm-2 yr-1 from this lake region, and around one fifth of the nitrogen lost from the land-water interface. © 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/106867
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: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, 18 Shuangqing Road, Haidian District, Beijing 100085, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Department of Microbiology, Radboud University Nijmegen, 3 6525 AJ Nijmegen, Netherlands; Center for Geomicrobiology, Department of Bioscience, Aarhus University, 8000 Aarhus C, Denmark; Institute for Geosciences, University of Kiel, D-24098 Kiel, Germany; Ecology and Biodiversity Group, Department of Biology, Utrecht University, 3508 TB Utrecht, Netherlands

Recommended Citation:
Zhu G.,Wang S.,Wang W.,et al. Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces[J]. Nature Geoscience,2013-01-01,6(2)
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