Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope
Abstract
Abstract Permafrost thaw is projected to restructure the connectivity of surface and subsurface flow paths, influencing export dynamics of dissolved organic matter (DOM) through Arctic watersheds. Resulting shifts in flow path 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, we found relatively rapid lateral flows occurred across a headwater Arctic tundra hillslope, as well as 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. Using high‐resolution nuclear magnetic resonance spectroscopy, we found that 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 catchments with similar topographic features.
- Authors:
-
[1];
[2];
[2];
[2];
[2];
[2];
[3];
[2]
- Cornell Univ., Ithaca, NY (United States)
- Colorado State Univ., Fort Collins, CO (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1502407
- Alternate Identifier(s):
- OSTI ID: 1491934
- Report Number(s):
- PNNL-SA-136691
Journal ID: ISSN 0886-6236
- Grant/Contract Number:
- AC05-76RL01830; DE‐SC0014664; DE‐SC0010568; DE‐AC05‐76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Global Biogeochemical Cycles
- Additional Journal Information:
- Journal Volume: 33; Journal Issue: 1; Journal ID: ISSN 0886-6236
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; 59 BASIC BIOLOGICAL SCIENCES; Arctic carbon cycling; global change biology; pore water chemistry; preferential flow; watershed chemistry
Citation Formats
Lynch, Laurel M., Machmuller, Megan B., Boot, Claudia M., Covino, Timothy P., Rithner, Christopher D., Cotrufo, M. Francesca, Hoyt, David W., and Wallenstein, Matthew D. Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope. United States: N. p., 2019.
Web. doi:10.1029/2018GB006030.
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. United States. https://doi.org/10.1029/2018GB006030
Lynch, Laurel M., Machmuller, Megan B., Boot, Claudia M., Covino, Timothy P., Rithner, Christopher D., Cotrufo, M. Francesca, Hoyt, David W., and Wallenstein, Matthew D. Sat .
"Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope". United States. https://doi.org/10.1029/2018GB006030. https://www.osti.gov/servlets/purl/1502407.
@article{osti_1502407,
title = {Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope},
author = {Lynch, Laurel M. and Machmuller, Megan B. and Boot, Claudia M. and Covino, Timothy P. and Rithner, Christopher D. and Cotrufo, M. Francesca and Hoyt, David W. and Wallenstein, Matthew D.},
abstractNote = {Abstract Permafrost thaw is projected to restructure the connectivity of surface and subsurface flow paths, influencing export dynamics of dissolved organic matter (DOM) through Arctic watersheds. Resulting shifts in flow path 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, we found relatively rapid lateral flows occurred across a headwater Arctic tundra hillslope, as well as 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. Using high‐resolution nuclear magnetic resonance spectroscopy, we found that 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 catchments with similar topographic features.},
doi = {10.1029/2018GB006030},
journal = {Global Biogeochemical Cycles},
number = 1,
volume = 33,
place = {United States},
year = {Sat Jan 05 00:00:00 EST 2019},
month = {Sat Jan 05 00:00:00 EST 2019}
}
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Works referencing / citing this record:
Microbial carbon and nitrogen processes in high‐Arctic riparian soils
journal, January 2020
- Pastor, Ada; Poblador, Sílvia; Skovsholt, Louis J.
- Permafrost and Periglacial Processes, Vol. 31, Issue 1