Investigating Thaw and Plant Productivity Constraints on Old Soil Carbon Respiration From Permafrost
Abstract
Abstract Isotopic radiocarbon (Δ 14 C) signatures of ecosystem respiration (Reco) can identify old soil carbon (C) loss and serve as an early indicator of permafrost destabilization in a warming climate. Warming also stimulates plant productivity causing plant respiration to dominate Reco Δ 14 C signatures and potentially obscuring old soil C loss. Here, we investigate how a wide spatio‐temporal gradient of permafrost thaw and plant productivity affects Reco Δ 14 C patterns and isotopic partitioning. Spatial gradients came from a warming experiment with doubling thaw depth and variable biomass, and a vegetation removal manipulation to eliminate plant contributions. We sampled in August and September to capture transitions from high to low plant productivity, decreased surface soil temperature, and relatively small seasonal thaw extensions. We found that surface processes dominate spatial variation in old soil C loss and a process‐based partitioning approach was crucial for constraining old soil C loss. Resampling the same plots in different times of the year revealed that old soil C losses tripled with cooling surface temperature, and the largest old soil C losses were detected when the organic‐to‐mineral soil horizons thawed (∼50–60 cm). We suggest that the measured increase in old soil respiration over the seasonmore »
- Authors:
-
[1];
[2];
[2];
[2]
- Univ. of Texas at El Paso, TX (United States)
- Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society
- Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society; Northern Arizona Univ., Flagstaff, AZ (United States). School of Informatics, Computing, and Cyber Systems
- Publication Date:
- Research Org.:
- Univ. of Florida, Gainesville, FL (United States); Northern Arizona Univ., Flagstaff, AZ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1850976
- Alternate Identifier(s):
- OSTI ID: 1798550
- Grant/Contract Number:
- SC0006982; SC0014085; 1026415; 1203777; 0747195; DE‐SC0006982; DE‐SC0014085
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Biogeosciences
- Additional Journal Information:
- Journal Volume: 126; Journal Issue: 6; Journal ID: ISSN 2169-8953
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; Environmental Sciences & Ecology; Geology
Citation Formats
Mauritz, Marguerite, Pegoraro, Elaine, Ogle, Kiona, Ebert, Christopher, and Schuur, Edward A. G. Investigating Thaw and Plant Productivity Constraints on Old Soil Carbon Respiration From Permafrost. United States: N. p., 2021.
Web. doi:10.1029/2020jg006000.
Mauritz, Marguerite, Pegoraro, Elaine, Ogle, Kiona, Ebert, Christopher, & Schuur, Edward A. G. Investigating Thaw and Plant Productivity Constraints on Old Soil Carbon Respiration From Permafrost. United States. https://doi.org/10.1029/2020jg006000
Mauritz, Marguerite, Pegoraro, Elaine, Ogle, Kiona, Ebert, Christopher, and Schuur, Edward A. G. Wed .
"Investigating Thaw and Plant Productivity Constraints on Old Soil Carbon Respiration From Permafrost". United States. https://doi.org/10.1029/2020jg006000. https://www.osti.gov/servlets/purl/1850976.
@article{osti_1850976,
title = {Investigating Thaw and Plant Productivity Constraints on Old Soil Carbon Respiration From Permafrost},
author = {Mauritz, Marguerite and Pegoraro, Elaine and Ogle, Kiona and Ebert, Christopher and Schuur, Edward A. G.},
abstractNote = {Abstract Isotopic radiocarbon (Δ 14 C) signatures of ecosystem respiration (Reco) can identify old soil carbon (C) loss and serve as an early indicator of permafrost destabilization in a warming climate. Warming also stimulates plant productivity causing plant respiration to dominate Reco Δ 14 C signatures and potentially obscuring old soil C loss. Here, we investigate how a wide spatio‐temporal gradient of permafrost thaw and plant productivity affects Reco Δ 14 C patterns and isotopic partitioning. Spatial gradients came from a warming experiment with doubling thaw depth and variable biomass, and a vegetation removal manipulation to eliminate plant contributions. We sampled in August and September to capture transitions from high to low plant productivity, decreased surface soil temperature, and relatively small seasonal thaw extensions. We found that surface processes dominate spatial variation in old soil C loss and a process‐based partitioning approach was crucial for constraining old soil C loss. Resampling the same plots in different times of the year revealed that old soil C losses tripled with cooling surface temperature, and the largest old soil C losses were detected when the organic‐to‐mineral soil horizons thawed (∼50–60 cm). We suggest that the measured increase in old soil respiration over the season and when the organic‐to‐mineral horizon thawed, may be explained by mobilization of nitrogen that stimulates microbial decomposition at depth. Our results suggest that soil C in the organic to mineral horizon may be an important source of soil C loss as the entire Arctic region warms and could lead to nonlinearities in projected permafrost climate feedbacks.},
doi = {10.1029/2020jg006000},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 6,
volume = 126,
place = {United States},
year = {Wed Jun 02 00:00:00 EDT 2021},
month = {Wed Jun 02 00:00:00 EDT 2021}
}
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