Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998
Global Biogeochemical Cycles
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Abstract
Carbon dioxide (CO2) and methane (CH4) exchange between the atmosphere and a subalpine wetland located in Rocky Mountain National Park, Colorado, at 3200 m elevation were measured during 1996-1998. Respiration, net CO2 flux, and CH4 flux were measured using the closed chamber method during snow-free periods and using gas diffusion calculations during snow-covered periods. The ranges of measured flux were 1.2-526 mmol CO2 m-2 d-1 (respiration), -1056-100 mmol CO2 m-2 d-1 (net CO2 exchange), and 0.1-36.8 mmol CH4 m-2 d-1 (a positive value represents efflux to the atmosphere). Respiration and CH4 emission were significantly correlated with 5 cm soil temperature. Annual respiration and CH4 emission were modeled by applying the flux-temperature relationships to a continuous soil temperature record during 1996-1998. Gross photosynthesis was modeled using a hyperbolic equation relating gross photosynthesis, photon flux density, and soil temperature. Modeled annual flux estimates indicate that the wetland was a net source of carbon gas to the atmosphere each of the three years: 8.9 mol C m-2 yr-1 in 1996, 9.5 mol C m-2 yr-1 in 1997, and 9.6 mol C m-2 yr-1 in 1998. This contrasts with the long-term carbon accumulation of ???0.7 mol m-2 yr-1 determined from 14C analyses of a peat core collected from the wetland.
Suggested Citation
Wickland, K., Striegl, R.G., Mast, M., Clow, D.W., 2001, Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998: Global Biogeochemical Cycles, v. 15, no. 2, p. 321-335, https://doi.org/10.1029/2000GB001325.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998 |
| Series title | Global Biogeochemical Cycles |
| DOI | 10.1029/2000GB001325 |
| Volume | 15 |
| Issue | 2 |
| Year Published | 2001 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Global Biogeochemical Cycles |
| First page | 321 |
| Last page | 335 |