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Title: Intermediate-scale community-level flux of CO2 and CH4 in a Minnesota peatland: putting the SPRUCE project in a global context

Journal Article · · Biogeochemistry
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Peatland measurements of CO2 and CH4 flux were obtained at scales appropriate to the in situ biological community below the tree layer to demonstrate representativeness of the spruce and peatland responses under climatic and environmental change (SPRUCE) experiment. Surface flux measurements were made using dual open-path analyzers over an area of 1.13 m2 in daylight and dark conditions along with associated peat temperatures, water table height, hummock moisture, atmospheric pressure and incident radiation data. Observations from August 2011 through December 2014 demonstrated seasonal trends correlated with temperature as the dominant apparent driving variable. The S1-Bog for the SPRUCE study was found to be representative of temperate peatlands in terms of CO2 and CH4 flux. Maximum net CO2 flux in midsummer showed similar rates of C uptake and loss: daytime surface uptake was -5 to -6 µmol m-2 s-1 and dark period loss rates were 4–5 µmol m-2 s-1 (positive values are carbon lost to the atmosphere). Maximum midsummer CH4-C flux ranged from 0.4 to 0.5 µmol m-2 s-1 and was a factor of 10 lower than dark CO2–C efflux rates. Midwinter conditions produced near-zero flux for both CO2 and CH4 with frozen surfaces. Integrating temperature-dependent models across annual periods showed dark CO2–C and CH4–C flux to be 894 ± 34 and 16 ± 2 gC m-2 y-1, respectively. Net ecosystem exchange of carbon from the shrub-forb-Sphagnum-microbial community (excluding tree contributions) ranged from -3.1 gCO2–C m-2 y-1 in 2013, to C losses from 21 to 65 gCO2–C m-2 y-1 for the other years.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
ERKP788; AC05-00OR22725
OSTI ID:
1302506
Alternate ID(s):
OSTI ID: 1324098
Journal Information:
Biogeochemistry, Journal Name: Biogeochemistry Vol. 129 Journal Issue: 3; ISSN 0168-2563
Publisher:
Springer Science + Business MediaCopyright Statement
Country of Publication:
Netherlands
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (4)

Stability of peatland carbon to rising temperatures journal December 2016
The Millennial model: in search of measurable pools and transformations for modeling soil carbon in the new century journal December 2017
Deep peat warming increases surface methane and carbon dioxide emissions in a black spruce-dominated ombrotrophic bog journal July 2017
Constraints on microbial communities, decomposition and methane production in deep peat deposits journal February 2020

Figures / Tables (12)

Figure 1(p. 41)figure Figure 1
Figure 2(p. 42)figure Figure 2
Figure 3(p. 43)figure Figure 3
Figure 4(p. 44)figure Figure 4
Figure 5(p. 45)figure Figure 5
Figure 6(p. 46)figure Figure 6
Figure S1(p. 47)figure Figure S1
Figure S2(p. 48)figure Figure S2
Figure S3(p. 49)figure Figure S3
Table 1(p. 50)table Table 1
Table 2(p. 51)table Table 2
Table 3(p. 52)table Table 3

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