Show simple item record Humphreys, Elyn R. Lafleur, Peter M. Flanagan, Larry B. Hedstrom, Newell Syed, Kamran H. Glenn, Aaron J. Granger, Raoul 2019-08-26T23:13:03Z 2019-08-26T23:13:03Z 2006
dc.identifier.citation Humphreys, E. R., Lafleur, P. M., Flanagan, L. B., Hedstrom, N., Syed, K. H. Glenn, A. J., & Granger, R. (2006). Summer carbon dioxide and water vapor fluxes across a range of northern peatlands. Journal of Geophysical Research (Biogeosciences), 111, G04011. doi:10.1029/2005JG000111 en_US
dc.description Sherpa Romeo green journal. Permission to archive final published version en_US
dc.description.abstract Northern peatlands are a diverse group of ecosystems varying along a continuum of hydrological, chemical, and vegetation gradients. These ecosystems contain about one third of the global soil carbon pool, but it is uncertain how carbon and water cycling processes and response to climate change differ among peatland types. This study examines midsummer CO2 and H2O fluxes measured using the eddy covariance technique above seven northern peatlands including a low-shrub bog, two open poor fens, two wooded moderately rich fens, and two open extreme-rich fens. Gross ecosystem production and ecosystem respiration correlated positively with vegetation indices and with each other. Consequently, 24-hour net ecosystem CO2 exchange was similar among most of the sites (an average net carbon sink of 1.5 ± 0.2 g C m 2 d 1) despite large differences in water table depth, water chemistry, and plant communities. Evapotranspiration was primarily radiatively driven at all sites but a decline in surface conductance with increasing water vapor deficit indicated physiological restrictions to transpiration, particularly at the peatlands with woody vegetation and less at the peatlands with 100% Sphagnum cover. Despite these differences, midday evapotranspiration ranged only from 0.21 to 0.34 mm h 1 owing to compensation among the factors controlling evapotranspiration. Water use efficiency varied among sites primarily as a result of differences in productivity and plant functional type. Although peatland classification includes a great variety of ecosystem characteristics,peatland type may not be an effective way to predict the magnitude and characteristics of midsummer CO2 and water vapor exchanges. en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.subject Net ecosystem exchange en_US
dc.subject Evapotranspiration en_US
dc.subject Fen en_US
dc.subject Bog
dc.subject CO2 fluxes
dc.subject H2O fluxes
dc.subject.lcsh Peatlands
dc.subject.lcsh Water vapor transport
dc.subject.lcsh Bog ecology
dc.subject.lcsh Fen ecology
dc.subject.lcsh Peatland ecology
dc.title Summer carbon dioxide and water vapor fluxes across a range of northern peatlands en_US
dc.type Article en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Biological Sciences en_US
dc.description.peer-review Yes en_US
dc.publisher.institution Trent University en_US
dc.publisher.institution University of Lethbridge en_US
dc.publisher.institution National Hydrology Research Centre en_US

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