Molecular Insights into Arctic Soil Organic Matter Degradation under Warming
Molecular composition of the Arctic soil organic carbon (SOC) and its susceptibility to microbial degradation are uncertain due to heterogeneity and unknown SOC compositions. By using ultrahigh-resolution mass spectrometry, we determined the susceptibility and compositional changes of extractable di...
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Online Access: | http://www.osti.gov/servlets/purl/1437889 https://www.osti.gov/biblio/1437889 https://doi.org/10.1021/acs.est.7b05469 |
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ftosti:oai:osti.gov:1437889 2023-07-30T04:01:14+02:00 Molecular Insights into Arctic Soil Organic Matter Degradation under Warming Chen, Hongmei Yang, Ziming Chu, Rosalie K. Tolic, Nikola Liang, Liyuan Graham, David E. Wullschleger, Stan D. Gu, Baohua 2023-06-27 application/pdf http://www.osti.gov/servlets/purl/1437889 https://www.osti.gov/biblio/1437889 https://doi.org/10.1021/acs.est.7b05469 unknown http://www.osti.gov/servlets/purl/1437889 https://www.osti.gov/biblio/1437889 https://doi.org/10.1021/acs.est.7b05469 doi:10.1021/acs.est.7b05469 59 BASIC BIOLOGICAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1021/acs.est.7b05469 2023-07-11T09:25:51Z Molecular composition of the Arctic soil organic carbon (SOC) and its susceptibility to microbial degradation are uncertain due to heterogeneity and unknown SOC compositions. By using ultrahigh-resolution mass spectrometry, we determined the susceptibility and compositional changes of extractable dissolved organic matter (EDOM) in an anoxic warming incubation experiment (up to 122 days) with a tundra soil from Alaska (United States). EDOM was extracted with 10 mM NH 4 HCO 3 from both the organic- and mineral-layer soils during incubation at both -2 and 8°C. Based on their O:C and H:C ratios, EDOM molecular formulas were qualitatively grouped into nine biochemical classes of compounds, among which lignin-like compounds dominated both the organic and the mineral soils and were the most stable, whereas amino sugars, peptides, and carbohydrate-like compounds were the most biologically labile. These results corresponded with shifts in EDOM elemental composition in which the ratios of O:C and N:C decreased, while the average C content in EDOM, molecular mass, and aromaticity increased after 122 days of incubation. This research demonstrates that certain EDOM components, such as amino sugars, peptides, and carbohydrate-like compounds, are disproportionately more susceptible to microbial degradation than others in the soil, and these results should be considered in SOC degradation models to improve predictions of Arctic climate feedbacks. Other/Unknown Material Arctic Tundra Alaska SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Environmental Science & Technology 52 8 4555 4564 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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59 BASIC BIOLOGICAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY 54 ENVIRONMENTAL SCIENCES |
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59 BASIC BIOLOGICAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY 54 ENVIRONMENTAL SCIENCES Chen, Hongmei Yang, Ziming Chu, Rosalie K. Tolic, Nikola Liang, Liyuan Graham, David E. Wullschleger, Stan D. Gu, Baohua Molecular Insights into Arctic Soil Organic Matter Degradation under Warming |
topic_facet |
59 BASIC BIOLOGICAL SCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY 54 ENVIRONMENTAL SCIENCES |
description |
Molecular composition of the Arctic soil organic carbon (SOC) and its susceptibility to microbial degradation are uncertain due to heterogeneity and unknown SOC compositions. By using ultrahigh-resolution mass spectrometry, we determined the susceptibility and compositional changes of extractable dissolved organic matter (EDOM) in an anoxic warming incubation experiment (up to 122 days) with a tundra soil from Alaska (United States). EDOM was extracted with 10 mM NH 4 HCO 3 from both the organic- and mineral-layer soils during incubation at both -2 and 8°C. Based on their O:C and H:C ratios, EDOM molecular formulas were qualitatively grouped into nine biochemical classes of compounds, among which lignin-like compounds dominated both the organic and the mineral soils and were the most stable, whereas amino sugars, peptides, and carbohydrate-like compounds were the most biologically labile. These results corresponded with shifts in EDOM elemental composition in which the ratios of O:C and N:C decreased, while the average C content in EDOM, molecular mass, and aromaticity increased after 122 days of incubation. This research demonstrates that certain EDOM components, such as amino sugars, peptides, and carbohydrate-like compounds, are disproportionately more susceptible to microbial degradation than others in the soil, and these results should be considered in SOC degradation models to improve predictions of Arctic climate feedbacks. |
author |
Chen, Hongmei Yang, Ziming Chu, Rosalie K. Tolic, Nikola Liang, Liyuan Graham, David E. Wullschleger, Stan D. Gu, Baohua |
author_facet |
Chen, Hongmei Yang, Ziming Chu, Rosalie K. Tolic, Nikola Liang, Liyuan Graham, David E. Wullschleger, Stan D. Gu, Baohua |
author_sort |
Chen, Hongmei |
title |
Molecular Insights into Arctic Soil Organic Matter Degradation under Warming |
title_short |
Molecular Insights into Arctic Soil Organic Matter Degradation under Warming |
title_full |
Molecular Insights into Arctic Soil Organic Matter Degradation under Warming |
title_fullStr |
Molecular Insights into Arctic Soil Organic Matter Degradation under Warming |
title_full_unstemmed |
Molecular Insights into Arctic Soil Organic Matter Degradation under Warming |
title_sort |
molecular insights into arctic soil organic matter degradation under warming |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1437889 https://www.osti.gov/biblio/1437889 https://doi.org/10.1021/acs.est.7b05469 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra Alaska |
genre_facet |
Arctic Tundra Alaska |
op_relation |
http://www.osti.gov/servlets/purl/1437889 https://www.osti.gov/biblio/1437889 https://doi.org/10.1021/acs.est.7b05469 doi:10.1021/acs.est.7b05469 |
op_doi |
https://doi.org/10.1021/acs.est.7b05469 |
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Environmental Science & Technology |
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52 |
container_issue |
8 |
container_start_page |
4555 |
op_container_end_page |
4564 |
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1772811986772426752 |