| 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. |
| Genre: | Article |
| ProdID: | 70023354 |
| Citation Author: | Wickland, K. P.; Striegl, R. G.; Mast, M. A.; Clow, D. W. |
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| Citation End Page: | 335 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Global Biogeochemical Cycles |
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| Citation Number Of Pages: | 15 |
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| Citation Search Results Text: | Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998; 2001; Article; Journal; Global Biogeochemical Cycles; Wickland, K. P.; Striegl, R. G.; Mast, M. A.; Clow, D. W. |
| Citation Start Page: | 321 |
| Citation Volume: | 15 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998; 2001; Article; Journal; Global Biogeochemical Cycles; Wickland, K. P.; Striegl, R. G.; Mast, M. A.; Clow, D. W. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1029/2000GB001325 |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
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