Manganese Oxidation during Vegetation Burning

F., Shyrill Mae; Zeng, Lingqun; Huang, Rixiang; Sanchez-Garcia, Carmen; Nuno, Cristina Santin; Tome, Jonay Neris; Yang, Peng; Ma, Lu; Kiss, Andrew

doi:10.1021/acs.est.6c05048

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Manganese Oxidation during Vegetation Burning

Shyrill Mae F. Mariano, Lingqun Zeng, Rixiang Huang

, Carmen Sanchez-Garcia, Cristina Santin Nuno, Jonay Neris Tome, Peng Yang

, Lu Ma, Andrew Kiss

Environmental Science & Technology

Swansea University Authors: Carmen Sanchez-Garcia, Cristina Santin Nuno, Jonay Neris Tome

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DOI (Published version): 10.1021/acs.est.6c05048

Abstract

Redox recycling of manganese (Mn) plays a key role in organic matter decomposition and nutrient cycling in terrestrial vegetated ecosystems, and it is expected to be changed by fires. This study revealed how Mn is oxidized during vegetation burning, by characterizing the chemical speciation of Mn in...

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Published in:	Environmental Science & Technology
ISSN:	0013-936X 1520-5851
Published:	American Chemical Society (ACS) 2026
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa72046

first_indexed	2026-06-10T14:40:25Z
last_indexed	2026-06-12T09:28:46Z
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This study revealed how Mn is oxidized during vegetation burning, by characterizing the chemical speciation of Mn in fire ash from wildland fires and laboratory burning and evaluating the factors governing its average oxidation state (AOS) and speciation. Manganese in wildland fire ash from different ecosystems showed variable AOS that ranges from 2.5 to 3.3. Laboratory burning experiments showed that Mn oxidation was primarily controlled by fire thermal intensity (temperature × duration) and burning completeness. As heating time increased from 5 min to 5 h at 550 and 700 °C, Mn AOS in the lab-burned vegetation ash increased from 2.7 to 4.0 and the oxidation rate was faster at higher temperature. Diverse Mn species can present in wildland fire ash and differ structurally from biogenic Mn oxides. The oxidized Mn species enable fire ash to mediate oxidative degradation of catechol, demonstrating its potential in mediating organic matter decomposition. 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We appreciate the support from beamline scientists Ryan Davis at SSRL Beamline 11-2 and Bruce Ravel at NSLS-II Beamline 6-BM. Portions of this research were conducted at the Stanford Synchrotron Radiation Lightsource (SSRL) and the National Synchrotron Light Source II. The authors are grateful to Neil Gifford, Amanda Dillon and Tyler Briggs at the Albany Pine Bush Preserve for assistance in collecting the prescribed fire samples. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. This research used 5-ID, 6-BM, and 7-BM of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under contract no. DE-SC0012704. C. Sánchez-García, C. Santín, and J. 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spelling	2026-06-10T15:43:19.3146650 v2 72046 2026-06-10 Manganese Oxidation during Vegetation Burning 466600dc1f90b208a9008df7c9805a7b Carmen Sanchez-Garcia Carmen Sanchez-Garcia true false 993c82cbaf875c1268156360e83c4dfd Cristina Santin Nuno Cristina Santin Nuno true false bc8475d9297bd8441f68d13a94585ce1 Jonay Neris Tome Jonay Neris Tome true false 2026-06-10 BGPS Redox recycling of manganese (Mn) plays a key role in organic matter decomposition and nutrient cycling in terrestrial vegetated ecosystems, and it is expected to be changed by fires. This study revealed how Mn is oxidized during vegetation burning, by characterizing the chemical speciation of Mn in fire ash from wildland fires and laboratory burning and evaluating the factors governing its average oxidation state (AOS) and speciation. Manganese in wildland fire ash from different ecosystems showed variable AOS that ranges from 2.5 to 3.3. Laboratory burning experiments showed that Mn oxidation was primarily controlled by fire thermal intensity (temperature × duration) and burning completeness. As heating time increased from 5 min to 5 h at 550 and 700 °C, Mn AOS in the lab-burned vegetation ash increased from 2.7 to 4.0 and the oxidation rate was faster at higher temperature. Diverse Mn species can present in wildland fire ash and differ structurally from biogenic Mn oxides. The oxidized Mn species enable fire ash to mediate oxidative degradation of catechol, demonstrating its potential in mediating organic matter decomposition. This study revealed a new paradigm of Mn redox recycling, as compared to the microbe-mediated Mn redox cycling in the absence of fires. Journal Article Environmental Science & Technology 0 American Chemical Society (ACS) 0013-936X 1520-5851 wildland fires, ash, manganese cycling, speciation, X-ray absorption spectroscopy 31 5 2026 2026-05-31 10.1021/acs.est.6c05048 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Another institution paid the OA fee This work was supported by SUNY System Administration under SUNY Research Seed Grant Award#241038 and National Science Foundation (#2120547). We appreciate the support from beamline scientists Ryan Davis at SSRL Beamline 11-2 and Bruce Ravel at NSLS-II Beamline 6-BM. Portions of this research were conducted at the Stanford Synchrotron Radiation Lightsource (SSRL) and the National Synchrotron Light Source II. The authors are grateful to Neil Gifford, Amanda Dillon and Tyler Briggs at the Albany Pine Bush Preserve for assistance in collecting the prescribed fire samples. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. This research used 5-ID, 6-BM, and 7-BM of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under contract no. DE-SC0012704. C. Sánchez-García, C. Santín, and J. Neris acknowledge funding by the Natural Environment Research Council grant (NE/R011125/1). During manuscript preparation, C. Sánchez-García was supported by the European Union’s Horizon 2020 research and innovation program under grant agreement #101003890. 2026-06-10T15:43:19.3146650 2026-06-10T15:24:35.1610668 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Shyrill Mae F. Mariano 1 Lingqun Zeng 2 Rixiang Huang 0000-0001-8233-5223 3 Carmen Sanchez-Garcia 4 Cristina Santin Nuno 5 Jonay Neris Tome 6 Peng Yang 0000-0002-5232-7019 7 Lu Ma 8 Andrew Kiss 9 72046__36921__b8223e0661214da5b9303616ebdc25cd.pdf 72046.VOR.pdf 2026-06-10T15:35:59.4910110 Output 6102043 application/pdf Version of Record true © 2026 The Authors. This publication is licensed under CC-BY 4.0 . true eng https://creativecommons.org/licenses/by/4.0/
title	Manganese Oxidation during Vegetation Burning
spellingShingle	Manganese Oxidation during Vegetation Burning Carmen Sanchez-Garcia Cristina Santin Nuno Jonay Neris Tome
title_short	Manganese Oxidation during Vegetation Burning
title_full	Manganese Oxidation during Vegetation Burning
title_fullStr	Manganese Oxidation during Vegetation Burning
title_full_unstemmed	Manganese Oxidation during Vegetation Burning
title_sort	Manganese Oxidation during Vegetation Burning
author_id_str_mv	466600dc1f90b208a9008df7c9805a7b 993c82cbaf875c1268156360e83c4dfd bc8475d9297bd8441f68d13a94585ce1
author_id_fullname_str_mv	466600dc1f90b208a9008df7c9805a7b_*_Carmen Sanchez-Garcia 993c82cbaf875c1268156360e83c4dfd__Cristina Santin Nuno bc8475d9297bd8441f68d13a94585ce1_**_Jonay Neris Tome
author	Carmen Sanchez-Garcia Cristina Santin Nuno Jonay Neris Tome
author2	Shyrill Mae F. Mariano Lingqun Zeng Rixiang Huang Carmen Sanchez-Garcia Cristina Santin Nuno Jonay Neris Tome Peng Yang Lu Ma Andrew Kiss
format	Journal article
container_title	Environmental Science & Technology
container_volume	0
publishDate	2026
institution	Swansea University
issn	0013-936X 1520-5851
doi_str_mv	10.1021/acs.est.6c05048
publisher	American Chemical Society (ACS)
college_str	Faculty of Science and Engineering
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description	Redox recycling of manganese (Mn) plays a key role in organic matter decomposition and nutrient cycling in terrestrial vegetated ecosystems, and it is expected to be changed by fires. This study revealed how Mn is oxidized during vegetation burning, by characterizing the chemical speciation of Mn in fire ash from wildland fires and laboratory burning and evaluating the factors governing its average oxidation state (AOS) and speciation. Manganese in wildland fire ash from different ecosystems showed variable AOS that ranges from 2.5 to 3.3. Laboratory burning experiments showed that Mn oxidation was primarily controlled by fire thermal intensity (temperature × duration) and burning completeness. As heating time increased from 5 min to 5 h at 550 and 700 °C, Mn AOS in the lab-burned vegetation ash increased from 2.7 to 4.0 and the oxidation rate was faster at higher temperature. Diverse Mn species can present in wildland fire ash and differ structurally from biogenic Mn oxides. The oxidized Mn species enable fire ash to mediate oxidative degradation of catechol, demonstrating its potential in mediating organic matter decomposition. This study revealed a new paradigm of Mn redox recycling, as compared to the microbe-mediated Mn redox cycling in the absence of fires.
published_date	2026-05-31T14:21:34Z
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Manganese Oxidation during Vegetation Burning

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