Summer carbon dioxide and water vapor fluxes across a range of northern peatlands

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dc.contributor.authorHumphreys, Elyn R.
dc.contributor.authorLafleur, Peter M.
dc.contributor.authorFlanagan, Larry B.
dc.contributor.authorHedstrom, Newell
dc.contributor.authorSyed, Kamran H.
dc.contributor.authorGlenn, Aaron J.
dc.contributor.authorGranger, Raoul
dc.date.accessioned2019-08-26T23:13:03Z
dc.date.available2019-08-26T23:13:03Z
dc.date.issued2006
dc.descriptionSherpa Romeo green journal. Permission to archive final published versionen_US
dc.description.abstractNorthern 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.description.peer-reviewYesen_US
dc.identifier.citationHumphreys, 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:10.1029/2005JG000111en_US
dc.identifier.urihttps://hdl.handle.net/10133/5519
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.publisher.departmentDepartment of Biological Sciencesen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionTrent Universityen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionNational Hydrology Research Centreen_US
dc.publisher.urlhttps://dx.doi.org/10.1029/2005JG000111
dc.subjectNet ecosystem exchangeen_US
dc.subjectEvapotranspirationen_US
dc.subjectFenen_US
dc.subjectBog
dc.subjectCO2 fluxes
dc.subjectH2O fluxes
dc.subject.lcshPeatlands
dc.subject.lcshWater vapor transport
dc.subject.lcshBog ecology
dc.subject.lcshFen ecology
dc.subject.lcshPeatland ecology
dc.titleSummer carbon dioxide and water vapor fluxes across a range of northern peatlandsen_US
dc.typeArticleen_US
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