Unexpected mechanism for glucose-primed soil organic carbon mineralization under an anaerobic–aerobic transition
Abstract
Redox reactions are important for cycling of carbon (C) in soils frequently subject to fluctuations in redox conditions, such as wetland soils, which contribute around one third of the global terrestrial C reservoir. Priming effects (PE), induction of changes in C mineralization due to additions of energy-rich organic carbon (OC) substrates, have been largely ignored during redox transitions in current modelling and experimental efforts for evaluating C cycles. In this study, we investigated the effects of glucose input on the mineralization of soil OC during an anaerobic-aerobic transition. Substantially more soil OC was mineralized under aerobic conditions in samples that received glucose under preceding anaerobic conditions compared to controls that did not receive glucose and to samples that received glucose under aerobic-only conditions. Our results reveal a novel PE by which glucose indirectly primes the mineralization of soil OC by increasing the reductive release of iron oxide-associated OC under anaerobic conditions, followed by a dramatic positive PE when aerobic conditions are reestablished. Inclusion of this novel indirect priming mechanism is crucial for accurately predicting the contribution of atmospheric greenhouse gases from soils experiencing redox fluctuations (e.g.,wetlands).
- Authors:
-
- Univ. of Nevada, Reno, NV (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Univ. of Massachusetts, Amherst, MA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1642418
- Alternate Identifier(s):
- OSTI ID: 1633817
- Report Number(s):
- PNNL-SA-153711
Journal ID: ISSN 0016-7061
- Grant/Contract Number:
- AC05-76RL01830; SC0014275
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geoderma
- Additional Journal Information:
- Journal Volume: 376; Journal ID: ISSN 0016-7061
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; glucose; iron reduction; priming effect; redox fluctuations; reductive dissolution; soil organic carbon
Citation Formats
Duham-Cheatham, Sarrah M., Zhao, Qian, Obrist, Daniel, and Yang, Yu. Unexpected mechanism for glucose-primed soil organic carbon mineralization under an anaerobic–aerobic transition. United States: N. p., 2020.
Web. doi:10.1016/j.geoderma.2020.114535.
Duham-Cheatham, Sarrah M., Zhao, Qian, Obrist, Daniel, & Yang, Yu. Unexpected mechanism for glucose-primed soil organic carbon mineralization under an anaerobic–aerobic transition. United States. https://doi.org/10.1016/j.geoderma.2020.114535
Duham-Cheatham, Sarrah M., Zhao, Qian, Obrist, Daniel, and Yang, Yu. Thu .
"Unexpected mechanism for glucose-primed soil organic carbon mineralization under an anaerobic–aerobic transition". United States. https://doi.org/10.1016/j.geoderma.2020.114535. https://www.osti.gov/servlets/purl/1642418.
@article{osti_1642418,
title = {Unexpected mechanism for glucose-primed soil organic carbon mineralization under an anaerobic–aerobic transition},
author = {Duham-Cheatham, Sarrah M. and Zhao, Qian and Obrist, Daniel and Yang, Yu},
abstractNote = {Redox reactions are important for cycling of carbon (C) in soils frequently subject to fluctuations in redox conditions, such as wetland soils, which contribute around one third of the global terrestrial C reservoir. Priming effects (PE), induction of changes in C mineralization due to additions of energy-rich organic carbon (OC) substrates, have been largely ignored during redox transitions in current modelling and experimental efforts for evaluating C cycles. In this study, we investigated the effects of glucose input on the mineralization of soil OC during an anaerobic-aerobic transition. Substantially more soil OC was mineralized under aerobic conditions in samples that received glucose under preceding anaerobic conditions compared to controls that did not receive glucose and to samples that received glucose under aerobic-only conditions. Our results reveal a novel PE by which glucose indirectly primes the mineralization of soil OC by increasing the reductive release of iron oxide-associated OC under anaerobic conditions, followed by a dramatic positive PE when aerobic conditions are reestablished. Inclusion of this novel indirect priming mechanism is crucial for accurately predicting the contribution of atmospheric greenhouse gases from soils experiencing redox fluctuations (e.g.,wetlands).},
doi = {10.1016/j.geoderma.2020.114535},
journal = {Geoderma},
number = ,
volume = 376,
place = {United States},
year = {Thu Jun 18 00:00:00 EDT 2020},
month = {Thu Jun 18 00:00:00 EDT 2020}
}
Web of Science
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