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dc.contributor.author Kross, Angela S.E.
dc.contributor.author Roulet, Nigel T.
dc.contributor.author Moore, Tim R.
dc.contributor.author Lafleur, Peter M.
dc.contributor.author Humphreys, Elyn R.
dc.contributor.author Seaquist, Jonathan W.
dc.contributor.author Flanagan, Larry B.
dc.contributor.author Aurela, Mike
dc.date.accessioned 2018-06-28T21:00:40Z
dc.date.available 2018-06-28T21:00:40Z
dc.date.issued 2014
dc.identifier.citation Kross, A. S. E., Roulet, N. T., Moore, T. R., Lafleur, P. M., Humphreys, E. R., Seaquist, J. W., ... Aurela, M. (2014). Phenology and its role in carbon dioxide exchange processes in northern peatlands. Journal of Geophysical Research: Biogeosciences, 119(7), 1370-1384. doi:10.1002/ 2014JG002666. en_US
dc.identifier.uri https://hdl.handle.net/10133/5143
dc.description Sherpa Romeo green journal. Permission to archive final published version. en_US
dc.description.abstract Ecosystem phenology plays an important role in carbon exchange processes and can be derived from continuous records of carbon dioxide (CO2) exchange data. In this study we examined the potential use of phenological indices for characterizing cumulative annual CO2 exchange in four contrasting northern peatland ecosystems. We used the approach of Jonsson and Eklundh (2004) to derive a set of phenological indices based on the daily time series of gross primary production (GPP), ecosystem respiration (Re), and net ecosystem production (NEP) measured in the four peatland sites. The main objectives of this study were (a) to examine the variation in phenological indices across sites and (b) to determine the relationships among phenological indices, environmental conditions, and cumulative annual CO2 exchange. The phenological index used to define the “start of the growing season” showed good potential for differentiation among sites based on their average annual site GPP. Sites with earlier growing seasons had the highest average annual site GPP. The “peak CO2 exchange rate” phenological index performed best in reflecting variations among sites and for estimating annual values of GPP, Re, and NEP (Pearson correlation coefficients ranged between 0.77 and 0.99, p<0.05forall.). The phenological indices and annual GPP, Re, and NEP were sensitive to winter (January–March) and summer (July–September) temperature and precipitation, but correlations, though significant, were weak. en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.subject Carbon dioxide exchange en_US
dc.subject Ecosystem phenology en_US
dc.subject Northern peatlands en_US
dc.subject Phenological indices en_US
dc.subject Meteorological variables en_US
dc.subject Peatland ecosystems
dc.subject.lcsh Phenology
dc.subject.lcsh Peatlands
dc.subject.lcsh Precipitation variability
dc.subject.lcsh Peatland ecology
dc.title Phenology and its role in carbon dioxide exchange processes in 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 Agriculture and Agri-Food Canada en_US
dc.publisher.institution McGill University en_US
dc.publisher.institution Trent University en_US
dc.publisher.institution Carleton University en_US
dc.publisher.institution Lund University en_US
dc.publisher.institution University of Lethbridge en_US
dc.publisher.institution Finnish Meteorological Institute en_US


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