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Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling

Lingqun Zeng, Shyrill F. Mariano, Rixiang Huang Orcid Logo, Carmen Sanchez-Garcia, Cristina Santin Nuno, Jonay Neris Tome, Kruthika Kumar, Chase K. Glenn, Omar El Hajj, Anita Anosike, Joseph O’Brien, Rawad A. Saleh Orcid Logo

Environmental Science & Technology, Volume: 59, Issue: 1, Pages: 454 - 466

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

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DOI (Published version): 10.1021/acs.est.4c07101

Abstract

This study investigated the speciation and aqueous dissolution of macronutrients in fire ash from diverse ecosystems and speciation of ash and smoke from laboratory burning, exploring the variations and their causes. The speciation of phosphorus (P), calcium (Ca), and potassium (K) in fire ash from...

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Published in: Environmental Science & Technology
ISSN: 0013-936X 1520-5851
Published: American Chemical Society (ACS) 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa68634
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The variability in ash macronutrient chemistry and ecosystem-specific fire ash loads resulted in varying loads and availability of individual macronutrient from fire among ecosystems. 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spelling 2025-01-31T10:23:59.4815663 v2 68634 2025-01-02 Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling 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 2025-01-02 BGPS This study investigated the speciation and aqueous dissolution of macronutrients in fire ash from diverse ecosystems and speciation of ash and smoke from laboratory burning, exploring the variations and their causes. The speciation of phosphorus (P), calcium (Ca), and potassium (K) in fire ash from five globally distributed ecosystems was characterized by using X-ray absorption spectroscopy and sequential fractionation. Aqueous dissolution of the macronutrients was measured by batch experiments at acidic and alkaline pHs. The results showed that P existed mainly as Ca phosphates, Ca as double carbonates, calcite, and sulfates, and most K was associated with Ca carbonates. Mineralogy and the relative abundance of the species were primarily controlled by elemental stoichiometry and fire temperature. Differences in Ca and P speciation existed between ash and smoke from laboratory burning, possibly caused by the temperature difference and/or mass fractionation during burning. The rates, extents, and pH dependencies of macronutrient dissolution differed among macronutrients and depended on their speciation, with K being highly soluble and the P and Ca regulated by solution pH. The variability in ash macronutrient chemistry and ecosystem-specific fire ash loads resulted in varying loads and availability of individual macronutrient from fire among ecosystems. This study provides a mechanistic understanding of how fires transform the chemistry of macronutrients and affect macronutrient returns to soils across different ecosystems, which is essential for evaluating the disturbance to ecosystem nutrient cycling by fires. Journal Article Environmental Science & Technology 59 1 454 466 American Chemical Society (ACS) 0013-936X 1520-5851 Terrestrial ecosystems, wildland fires, fire ash, smoke, macronutrients, speciation, X-ray absorption spectroscopy (XAS) 14 1 2025 2025-01-14 10.1021/acs.est.4c07101 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Another institution paid the OA fee This work was supported by Startup funds from University at Albany and National Science Foundation (#2120547). The authors would like to thank NSLS beamline scientists Drs. Sarah Nicolas and Yonghua Du for assistance in experimental setup. This research used 8-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.S.-G., C.S., and J.N. acknowledge funding by Natural Environment Research Council grant (NE/R011125/1). During manuscript preparation, C.S.-G. was supported by the European Union’s Horizon 2020 research and innovation programme under grant agreement #101003890. The G-WISE campaign was supported by National Science Foundation, Division of Atmospheric and Geospace Sciences (AGS-2144062). 2025-01-31T10:23:59.4815663 2025-01-02T13:56:22.6327542 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Lingqun Zeng 1 Shyrill F. Mariano 2 Rixiang Huang 0000-0001-8233-5223 3 Carmen Sanchez-Garcia 4 Cristina Santin Nuno 5 Jonay Neris Tome 6 Kruthika Kumar 7 Chase K. Glenn 8 Omar El Hajj 9 Anita Anosike 10 Joseph O’Brien 11 Rawad A. Saleh 0000-0002-4951-7962 12 68634__33231__2f250df19fe0467d94ece0269c5a29da.pdf 68634.VOR.pdf 2025-01-02T14:01:59.4967017 Output 3932328 application/pdf Version of Record true © 2024 The Authors. This publication is licensed under CC-BY 4.0. true eng https://creativecommons.org/licenses/by/4.0/
title Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling
spellingShingle Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling
Carmen Sanchez-Garcia
Cristina Santin Nuno
Jonay Neris Tome
title_short Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling
title_full Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling
title_fullStr Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling
title_full_unstemmed Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling
title_sort Speciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling
author_id_str_mv 466600dc1f90b208a9008df7c9805a7b
993c82cbaf875c1268156360e83c4dfd
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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 Lingqun Zeng
Shyrill F. Mariano
Rixiang Huang
Carmen Sanchez-Garcia
Cristina Santin Nuno
Jonay Neris Tome
Kruthika Kumar
Chase K. Glenn
Omar El Hajj
Anita Anosike
Joseph O’Brien
Rawad A. Saleh
format Journal article
container_title Environmental Science & Technology
container_volume 59
container_issue 1
container_start_page 454
publishDate 2025
institution Swansea University
issn 0013-936X
1520-5851
doi_str_mv 10.1021/acs.est.4c07101
publisher American Chemical Society (ACS)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description This study investigated the speciation and aqueous dissolution of macronutrients in fire ash from diverse ecosystems and speciation of ash and smoke from laboratory burning, exploring the variations and their causes. The speciation of phosphorus (P), calcium (Ca), and potassium (K) in fire ash from five globally distributed ecosystems was characterized by using X-ray absorption spectroscopy and sequential fractionation. Aqueous dissolution of the macronutrients was measured by batch experiments at acidic and alkaline pHs. The results showed that P existed mainly as Ca phosphates, Ca as double carbonates, calcite, and sulfates, and most K was associated with Ca carbonates. Mineralogy and the relative abundance of the species were primarily controlled by elemental stoichiometry and fire temperature. Differences in Ca and P speciation existed between ash and smoke from laboratory burning, possibly caused by the temperature difference and/or mass fractionation during burning. The rates, extents, and pH dependencies of macronutrient dissolution differed among macronutrients and depended on their speciation, with K being highly soluble and the P and Ca regulated by solution pH. The variability in ash macronutrient chemistry and ecosystem-specific fire ash loads resulted in varying loads and availability of individual macronutrient from fire among ecosystems. This study provides a mechanistic understanding of how fires transform the chemistry of macronutrients and affect macronutrient returns to soils across different ecosystems, which is essential for evaluating the disturbance to ecosystem nutrient cycling by fires.
published_date 2025-01-14T14:13:23Z
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