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Title: Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands

Abstract

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 deepermore » 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 non-competitive 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.« less

Authors:
 [1];  [2];  [3];  [4];  [2];  [3];  [3];  [5];  [5];  [3];  [1];  [5]; ORCiD logo [6]
  1. Microbiology Department, The Ohio State University, Columbus OH 43210 USA
  2. Environmental Molecular Sciences Laboratory, Richland WA 99350 USA
  3. United States Geological Survey - Northern Prairie Wildlife Research Center, Jamestown ND 58401 USA
  4. United States Geological Survey, Crustal Geophysics and Geochemistry Science Center, Building 20, Denver Federal Center Denver CO 80225 USA
  5. School of Earth Sciences, The Ohio State University, Columbus OH 43210 USA
  6. Microbiology Department, The Ohio State University, Columbus OH 43210 USA; School of Earth Sciences, The Ohio State University, Columbus OH 43210 USA
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1406680
Report Number(s):
PNNL-SA-120033
Journal ID: ISSN 1354-1013; 48837; KP1704020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Global Change Biology; Journal Volume: 23; Journal Issue: 8
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Dalcin Martins, Paula, Hoyt, David W., Bansal, Sheel, Mills, Christopher T., Tfaily, Malak, Tangen, Brian A., Finocchiaro, Raymond G., Johnston, Michael D., McAdams, Brandon C., Solensky, Matthew J., Smith, Garrett J., Chin, Yu-Ping, and Wilkins, Michael J.. Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands. United States: N. p., 2017. Web. doi:10.1111/gcb.13633.
Dalcin Martins, Paula, Hoyt, David W., Bansal, Sheel, Mills, Christopher T., Tfaily, Malak, Tangen, Brian A., Finocchiaro, Raymond G., Johnston, Michael D., McAdams, Brandon C., Solensky, Matthew J., Smith, Garrett J., Chin, Yu-Ping, & Wilkins, Michael J.. Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands. United States. doi:10.1111/gcb.13633.
Dalcin Martins, Paula, Hoyt, David W., Bansal, Sheel, Mills, Christopher T., Tfaily, Malak, Tangen, Brian A., Finocchiaro, Raymond G., Johnston, Michael D., McAdams, Brandon C., Solensky, Matthew J., Smith, Garrett J., Chin, Yu-Ping, and Wilkins, Michael J.. Thu . "Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands". United States. doi:10.1111/gcb.13633.
@article{osti_1406680,
title = {Abundant carbon substrates drive extremely high sulfate reduction rates and methane fluxes in Prairie Pothole Wetlands},
author = {Dalcin Martins, Paula and Hoyt, David W. and Bansal, Sheel and Mills, Christopher T. and Tfaily, Malak and Tangen, Brian A. and Finocchiaro, Raymond G. and Johnston, Michael D. and McAdams, Brandon C. and Solensky, Matthew J. and Smith, Garrett J. and Chin, Yu-Ping and Wilkins, Michael J.},
abstractNote = {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 non-competitive 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.},
doi = {10.1111/gcb.13633},
journal = {Global Change Biology},
number = 8,
volume = 23,
place = {United States},
year = {Thu Feb 23 00:00:00 EST 2017},
month = {Thu Feb 23 00:00:00 EST 2017}
}