Oxidation of soil organic carbon during an anoxic-oxic transition
Abstract
Redox reactions of iron (Fe) can play an important role in controlling the stability and transformation of organic carbon (OC) in soils. However, there is limited knowledge about the dynamics of Fe and OC in soils during anoxic-oxic transitions, which are common in temperate and tropical biomes. In this study, we investigated the fate and transformation of Fe and OC during a 5-day oxic incubation of four pre-reduced (8 days anoxic) forest soils. Up to 3.7% of total OC in the pre-reduced soils was oxidized to CO2, in conjunction with the oxidation of 31 –84% of the extractable Fe(II). OC oxidation in pre-reduced soils was lower than non-reducedcontrol soils, indicating that recently anoxically-incubated soils support lower OC metabolism upon re-oxidation than consistently oxic soils. Oxic OC oxidation was negatively correlated with the fraction of Fe-bound OC and also the fraction of short-range-ordered (SRO) Fe oxides. These results suggest that association with Fe oxides—especially SRO Fe oxides—can inhibit the availability of OC for oxidation. However, the difference between the oxidation of OC in pre40 reduced soils and consistently oxic controls could not be linked to the moderate changes in the Fe mineral composition during the anoxic-oxic transition, indicating the importance ofmore »
- Authors:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Nevada, Reno, NV (United States)
- Univ. of Nevada, Reno, NV (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Nevada, Reno, NV (United States)
- Univ. of Georgia, Athens, GA (United States)
- Davidson Academy of Nevada, Reno, NV (United States)
- Desert Research Inst. (DRI), Reno, NV (United States); Univ. of Massachusetts, Lowell, MA (United States)
- Peking Univ., Beijing (China)
- Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE; USDA
- OSTI Identifier:
- 1755197
- Alternate Identifier(s):
- OSTI ID: 1639138
- Report Number(s):
- PNNL-SA-154575
Journal ID: ISSN 0016-7061
- Grant/Contract Number:
- AC05-76RL01830; SC0014275
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geoderma
- Additional Journal Information:
- Journal Volume: 377; Journal ID: ISSN 0016-7061
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Mineralogy; Geochemistry; Iron oxides; Carbon
Citation Formats
Zhao, Qian, Duham-Cheatham, Sarrah M., Adhikari, Dinesh, Chen, Chunmei, Patel, Aman, Poulson, Simon R., Obrist, Daniel, Verburg, Paul S. J., Wang, Xilong, Roden, Eric R., Thompson, Aaron, and Yang, Yu. Oxidation of soil organic carbon during an anoxic-oxic transition. United States: N. p., 2020.
Web. doi:10.1016/j.geoderma.2020.114584.
Zhao, Qian, Duham-Cheatham, Sarrah M., Adhikari, Dinesh, Chen, Chunmei, Patel, Aman, Poulson, Simon R., Obrist, Daniel, Verburg, Paul S. J., Wang, Xilong, Roden, Eric R., Thompson, Aaron, & Yang, Yu. Oxidation of soil organic carbon during an anoxic-oxic transition. United States. https://doi.org/10.1016/j.geoderma.2020.114584
Zhao, Qian, Duham-Cheatham, Sarrah M., Adhikari, Dinesh, Chen, Chunmei, Patel, Aman, Poulson, Simon R., Obrist, Daniel, Verburg, Paul S. J., Wang, Xilong, Roden, Eric R., Thompson, Aaron, and Yang, Yu. Mon .
"Oxidation of soil organic carbon during an anoxic-oxic transition". United States. https://doi.org/10.1016/j.geoderma.2020.114584. https://www.osti.gov/servlets/purl/1755197.
@article{osti_1755197,
title = {Oxidation of soil organic carbon during an anoxic-oxic transition},
author = {Zhao, Qian and Duham-Cheatham, Sarrah M. and Adhikari, Dinesh and Chen, Chunmei and Patel, Aman and Poulson, Simon R. and Obrist, Daniel and Verburg, Paul S. J. and Wang, Xilong and Roden, Eric R. and Thompson, Aaron and Yang, Yu},
abstractNote = {Redox reactions of iron (Fe) can play an important role in controlling the stability and transformation of organic carbon (OC) in soils. However, there is limited knowledge about the dynamics of Fe and OC in soils during anoxic-oxic transitions, which are common in temperate and tropical biomes. In this study, we investigated the fate and transformation of Fe and OC during a 5-day oxic incubation of four pre-reduced (8 days anoxic) forest soils. Up to 3.7% of total OC in the pre-reduced soils was oxidized to CO2, in conjunction with the oxidation of 31 –84% of the extractable Fe(II). OC oxidation in pre-reduced soils was lower than non-reducedcontrol soils, indicating that recently anoxically-incubated soils support lower OC metabolism upon re-oxidation than consistently oxic soils. Oxic OC oxidation was negatively correlated with the fraction of Fe-bound OC and also the fraction of short-range-ordered (SRO) Fe oxides. These results suggest that association with Fe oxides—especially SRO Fe oxides—can inhibit the availability of OC for oxidation. However, the difference between the oxidation of OC in pre40 reduced soils and consistently oxic controls could not be linked to the moderate changes in the Fe mineral composition during the anoxic-oxic transition, indicating the importance of longer term OC association with Fe oxides, as well as other processes, in regulating the oxidation of OC during the redox fluctuations. OC association with Fe oxides should be considered during simulations of biogeochemical cycling of OC in soils during the redox fluctuations, for which other processes such as the anoxic transformation of OC and response of the microbial community also need to be incorporated.},
doi = {10.1016/j.geoderma.2020.114584},
journal = {Geoderma},
number = ,
volume = 377,
place = {United States},
year = {Mon Jul 20 00:00:00 EDT 2020},
month = {Mon Jul 20 00:00:00 EDT 2020}
}
Web of Science
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