Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope
Permafrost thaw will likely restructure the connectivity of surface and subsurface flowpaths, influencing export dynamics of dissolved organic matter (DOM) through Arctic watersheds. Resulting shifts in flowpath exchange between both soil horizons (organic-mineral) and landscape positions (hillslope...
Published in: | Global Biogeochemical Cycles |
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Online Access: | http://www.osti.gov/servlets/purl/1502407 https://www.osti.gov/biblio/1502407 https://doi.org/10.1029/2018GB006030 |
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ftosti:oai:osti.gov:1502407 2023-07-30T04:00:44+02:00 Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope Lynch, Laurel M. Machmuller, Megan B. Boot, Claudia M. Covino, Timothy P. Rithner, Christopher D. Cotrufo, M. Francesca Hoyt, David W. Wallenstein, Matthew D. 2022-05-25 application/pdf http://www.osti.gov/servlets/purl/1502407 https://www.osti.gov/biblio/1502407 https://doi.org/10.1029/2018GB006030 unknown http://www.osti.gov/servlets/purl/1502407 https://www.osti.gov/biblio/1502407 https://doi.org/10.1029/2018GB006030 doi:10.1029/2018GB006030 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES 59 BASIC BIOLOGICAL SCIENCES 2022 ftosti https://doi.org/10.1029/2018GB006030 2023-07-11T09:32:07Z Permafrost thaw will likely restructure the connectivity of surface and subsurface flowpaths, influencing export dynamics of dissolved organic matter (DOM) through Arctic watersheds. Resulting shifts in flowpath exchange between both soil horizons (organic-mineral) and landscape positions (hillslope-riparian) could alter DOM mobility and molecular-level patterns in chemical composition. Using conservative tracers and ecometabolomics, we found relatively rapid lateral flows across Arctic hillslopes and along the mineral-permafrost interface. While pore waters collected from the organic horizon were associated with plant-derived molecules, those collected from permafrost-influenced mineral horizons had a microbial origin, as determined by fluorescence spectroscopy. Here, Riparian DOM had greater structural diversity than hillslope DOM, suggesting riparian soils could supply a diverse array of compounds to surface waters if terrestrial-aquatic connectivity increases with warming. In combination, these results suggest that integrating DOM mobilization with its chemical and spatial heterogeneity can help predict how permafrost loss will structure ecosystem metabolism and carbon-climate feedbacks in Arctic watersheds. Other/Unknown Material Arctic permafrost Tundra SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Global Biogeochemical Cycles 33 1 47 62 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
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54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES 59 BASIC BIOLOGICAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES 59 BASIC BIOLOGICAL SCIENCES Lynch, Laurel M. Machmuller, Megan B. Boot, Claudia M. Covino, Timothy P. Rithner, Christopher D. Cotrufo, M. Francesca Hoyt, David W. Wallenstein, Matthew D. Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope |
topic_facet |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES 59 BASIC BIOLOGICAL SCIENCES |
description |
Permafrost thaw will likely restructure the connectivity of surface and subsurface flowpaths, influencing export dynamics of dissolved organic matter (DOM) through Arctic watersheds. Resulting shifts in flowpath exchange between both soil horizons (organic-mineral) and landscape positions (hillslope-riparian) could alter DOM mobility and molecular-level patterns in chemical composition. Using conservative tracers and ecometabolomics, we found relatively rapid lateral flows across Arctic hillslopes and along the mineral-permafrost interface. While pore waters collected from the organic horizon were associated with plant-derived molecules, those collected from permafrost-influenced mineral horizons had a microbial origin, as determined by fluorescence spectroscopy. Here, Riparian DOM had greater structural diversity than hillslope DOM, suggesting riparian soils could supply a diverse array of compounds to surface waters if terrestrial-aquatic connectivity increases with warming. In combination, these results suggest that integrating DOM mobilization with its chemical and spatial heterogeneity can help predict how permafrost loss will structure ecosystem metabolism and carbon-climate feedbacks in Arctic watersheds. |
author |
Lynch, Laurel M. Machmuller, Megan B. Boot, Claudia M. Covino, Timothy P. Rithner, Christopher D. Cotrufo, M. Francesca Hoyt, David W. Wallenstein, Matthew D. |
author_facet |
Lynch, Laurel M. Machmuller, Megan B. Boot, Claudia M. Covino, Timothy P. Rithner, Christopher D. Cotrufo, M. Francesca Hoyt, David W. Wallenstein, Matthew D. |
author_sort |
Lynch, Laurel M. |
title |
Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope |
title_short |
Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope |
title_full |
Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope |
title_fullStr |
Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope |
title_full_unstemmed |
Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope |
title_sort |
dissolved organic matter chemistry and transport along an arctic tundra hillslope |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1502407 https://www.osti.gov/biblio/1502407 https://doi.org/10.1029/2018GB006030 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_relation |
http://www.osti.gov/servlets/purl/1502407 https://www.osti.gov/biblio/1502407 https://doi.org/10.1029/2018GB006030 doi:10.1029/2018GB006030 |
op_doi |
https://doi.org/10.1029/2018GB006030 |
container_title |
Global Biogeochemical Cycles |
container_volume |
33 |
container_issue |
1 |
container_start_page |
47 |
op_container_end_page |
62 |
_version_ |
1772811287161470976 |