Tundra is a consistent source of CO 2 at a site with progressive permafrost thaw during 6 years of chamber and eddy covariance measurements: Tundra CO 2 Fluxes

Celis, Gerardo; Mauritz, Marguerite; Bracho, Rosvel; Salmon, Verity G.; Webb, Elizabeth E.; Hutchings, Jack; Natali, Susan M.; Schädel, Christina; Crummer, Kathryn G.; Schuur, Edward A.  G.

doi:10.1002/2016JG003671

Title: Tundra is a consistent source of CO ₂ at a site with progressive permafrost thaw during 6 years of chamber and eddy covariance measurements: Tundra CO ₂ Fluxes

Journal Article · Wed Jun 28 00:00:00 EDT 2017 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1002/2016JG003671· OSTI ID:1376643

^[1]; Mauritz, Marguerite ^[2]; Bracho, Rosvel ^[3];

^[4];

^[3];

^[5];

^[2]; Crummer, Kathryn G. ^[3]; Schuur, Edward A. G. ^[1]

Northern Arizona Univ., Flagstaff, AZ (United States); Univ. of Florida, Gainesville, FL (United States)
Northern Arizona Univ., Flagstaff, AZ (United States)
Univ. of Florida, Gainesville, FL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Woods Hole Research Center, Falmouth, MA (United States)

Current and future warming of high-latitude ecosystems will play an important role in climate change through feedbacks to the global carbon cycle. This study compares 6 years of CO₂ flux measurements in moist acidic tundra using autochambers and eddy covariance (Tower) approaches. Here, we found that the tundra was an annual source of CO₂ to the atmosphere as indicated by net ecosystem exchange using both methods with a combined mean of 105 ± 17 g CO₂ C m-2 y-1 across methods and years (Tower 87 ± 17 and Autochamber 123 ± 14). Furthermore, the difference between methods was largest early in the observation period, with Autochambers indicated a greater CO₂ source to the atmosphere. This discrepancy diminished through time, and in the final year the Autochambers measured a greater sink strength than tower. Active layer thickness was a significant driver of net ecosystem carbon exchange, gross ecosystem primary productivity, and Reco and could account for differences between Autochamber and Tower. The stronger source initially attributed lower summer season gross primary production (GPP) during the first 3 years, coupled with lower ecosystem respiration (Reco) during the first year. The combined suppression of GPP and Reco in the first year of Autochamber measurements could be the result of the experimental setup. Root damage associated with Autochamber soil collar installation may have lowered the plant community's capacity to fix C, but recovered within 3 years. And while this ecosystem was a consistent CO₂ sink during the summer, CO₂ emissions during the nonsummer months offset summer CO₂ uptake each year.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1376643

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 122, Issue 6; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Cited By (1)

Evidence for non-steady-state carbon emissions from snow-scoured alpine tundra Knowles, John F.; Blanken, Peter D.; Lawrence, Corey R. Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-09149-2	journal	March 2019

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Title: Tundra is a consistent source of CO 2 at a site with progressive permafrost thaw during 6 years of chamber and eddy covariance measurements: Tundra CO 2 Fluxes

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