Articles | Volume 19, issue 12
https://doi.org/10.5194/bg-19-3099-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-3099-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
01 Jul 2022
Research article |
| 01 Jul 2022
| 01 Jul 2022
Organic matter transformations are disconnected between surface water and the hyporheic zone
Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Sarah J. Fansler
Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Malak M. Tfaily
Department of Environmental Science, University of Arizona, Tucson, AZ 85719, USA
Vanessa A. Garayburu-Caruso
Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Amy E. Goldman
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Robert E. Danczak
Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Rosalie K. Chu
Environmental Molecular Sciences Laboratory, Richland, WA 99352, USA
Lupita Renteria
Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Jerry Tagestad
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Jason Toyoda
Environmental Molecular Sciences Laboratory, Richland, WA 99352, USA
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Conceptual models link microbes with the environment but are untested. We test a recent model using riverbed sediments. We exposed sediments to disturbances, going dry and becoming wet again. As the length of dry conditions got longer, there was a sudden shift in the ecology of microbes, chemistry of organic matter, and rates of microbial metabolism. We propose a new model based on feedbacks initiated by disturbance that cascade across biological, chemical, and functional aspects of the system.
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Short summary
Rivers are vital to Earth, and in rivers, organic matter (OM) is an energy source for microbes that make greenhouse gas and remove contaminants. Predicting Earth’s future requires understanding how and why river OM is transformed. Our results help meet this need. We found that the processes influencing OM transformations diverge between river water and riverbed sediments. This can be used to build new models for predicting the future of rivers and, in turn, the Earth system.
Rivers are vital to Earth, and in rivers, organic matter (OM) is an energy source for microbes...
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