globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13633
论文题名:
Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands
作者: Dalcin Martins P.; Hoyt D.W.; Bansal S.; Mills C.T.; Tfaily M.; Tangen B.A.; Finocchiaro R.G.; Johnston M.D.; McAdams B.C.; Solensky M.J.; Smith G.J.; Chin Y.-P.; Wilkins M.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:8
起始页码: 3107
结束页码: 3120
语种: 英语
英文关键词: 16S rRNA gene sequencing ; carbon and sulfur cycling ; methane emissions ; sediments ; sulfate reduction rates ; wetlands
英文摘要: Inland waters are increasingly recognized as critical sites of methane emissions to the atmosphere, but the biogeochemical reactions driving such fluxes are less well understood. The Prairie Pothole Region (PPR) of North America is one of the largest wetland complexes in the world, containing millions of small, shallow wetlands. The sediment pore waters of PPR wetlands contain some of the highest concentrations of dissolved organic carbon (DOC) and sulfur species ever recorded in terrestrial aquatic environments. Using a suite of geochemical and microbiological analyses, we measured the impact of sedimentary carbon and sulfur transformations in these wetlands on methane fluxes to the atmosphere. This research represents the first study of coupled geochemistry and microbiology within the PPR and demonstrates how the conversion of abundant labile DOC pools into methane results in some of the highest fluxes of this greenhouse gas to the atmosphere ever reported. Abundant DOC and sulfate additionally supported some of the highest sulfate reduction rates ever measured in terrestrial aquatic environments, which we infer to account for a large fraction of carbon mineralization in this system. Methane accumulations in zones of active sulfate reduction may be due to either the transport of free methane gas from deeper locations or the co-occurrence of methanogenesis and sulfate reduction. If both respiratory processes are concurrent, any competitive inhibition of methanogenesis by sulfate-reducing bacteria may be lessened by the presence of large labile DOC pools that yield noncompetitive substrates such as methanol. Our results reveal some of the underlying mechanisms that make PPR wetlands biogeochemical hotspots, which ultimately leads to their critical, but poorly recognized role in regional greenhouse gas emissions. © 2017 John Wiley & Sons Ltd
资助项目: We would like to thank Samantha B. Joye, Sairah Malkin, Rayan Sibert, and Vladimir Samarkin for practical and theoretical knowledge on SRR measurements, Robert Danczak for helping with R programming, Gil Bohrer and Tim Morin for insights on methane concentrations and fluxes, Martin B. Goldhaber for valuable comments on the manuscript, and David Mushet for supporting our efforts. A portion of this research was performed using EMSL, a DOE Office of Science User Facility sponsored by the Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory supported by DOE contract No. DE-AC05-76RL01830. Additionally, DNA sequencing was conducted by the U.S. Department of Energy Joint Genome Institute, a DOE Office of Science User Facility that is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. A portion of this research was also funded by the U.S. Geological Survey Climate and Land Use Change R&D Program and NSF grant EAR-1246594 awarded to Y-P.C. The USGS data can be found at Bansal & Tangen,. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60876
Appears in Collections:影响、适应和脆弱性

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作者单位: Microbiology Department, The Ohio State University, Columbus, OH, United States; Environmental Molecular Sciences Laboratory, Richland, WA, United States; United States Geological Survey - Northern Prairie Wildlife Research Center, Jamestown, ND, United States; United States Geological Survey, Crustal Geophysics and Geochemistry Science Center, Building 20, Denver Federal Center, Denver, CO, United States; School of Earth Sciences, The Ohio State University, Columbus, OH, United States

Recommended Citation:
Dalcin Martins P.,Hoyt D.W.,Bansal S.,et al. Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands[J]. Global Change Biology,2017-01-01,23(8)
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