Contrasting responses of growing season ecosystem CO2 exchange to variation in temperature and water table depth in two peatlands in northern Alberta, Canada

Simple item page
dc.contributor.authorAdkinson, Angela C.
dc.contributor.authorSyed, Kamran H.
dc.contributor.authorFlanagan, Larry B.
dc.date.accessioned2019-08-26T22:18:29Z
dc.date.available2019-08-26T22:18:29Z
dc.date.issued2011
dc.descriptionSherpa Romeo green journal. Permission to archive final published versionen_US
dc.description.abstractThe large belowground carbon stocks in northern peatland ecosystems are potentially susceptible to release because of the expected differential responses of photosynthesis and respiration to climate change. This study compared net ecosystem CO2 exchange (NEE) measured using the eddy covariance technique at two peatland sites in northern Alberta, Canada, over three growing seasons (May–October). We observed distinct differences between the poor fen (Sphagnum moss dominated) and extreme‐rich fen (Carex sedge dominated) sites for their responses of NEE to interannual variation in temperature and water table depth. The rates of growing season cumulative NEE at the poor fen were very similar among the three study years with an average (± standard deviation) of −110.1 ± 0.5 g C m−2 period−1. By contrast, the growing season cumulative NEE at the extreme‐rich fen varied substantially among years (−34.5, −153.5, and −41.8 g C m−2 period−1 in 2004, 2005, and 2006, respectively), and net uptake of CO2 was lower (on average) than at the poor fen. Consistent with the eddy covariance measurements, analysis of 210Pb‐dated peat cores also showed higher recent net rates of carbon accumulation in the poor fen than in the rich fen. Warm spring temperatures and sufficient water availability during the growing season resulted in the highest‐magnitude ecosystem photosynthesis and NEE at the extreme‐rich fen in 2005. Cool spring temperatures limited photosynthesis at the extreme‐rich fen in 2004, while reduced water availability (lower water table) in 2006 constrained photosynthetic capacity relative to 2005, despite the warmer spring and summer temperatures in 2006. The combination of contrasting plant functional types and different peat water table features at our two study sites meant that the poor fen showed a reduced response of ecosystem CO2 exchange to environmental variation compared to the extreme‐rich fen.en_US
dc.description.peer-reviewYesen_US
dc.identifier.citationAdkinson, A. C., Syed, K. H., & Flanagan, L. B. (2011). Contrasting responses of growing season ecosystem CO2 exchange to variation in temperature and water table depth in two peatlands in northern Alberta, Canada. Journal of Geophysical Research (Biogeosciences), 116,G01004. doi:10.1029/2010JG001512, 2011, 116en_US
dc.identifier.urihttps://hdl.handle.net/10133/5517
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.institutionUniversity of Lethbridgeen_US
dc.publisher.urlhttps://dx.doi.org/10.1029/2010JG001512
dc.subjectPhotosynthesisen_US
dc.subjectCarbon budgeten_US
dc.subjectFluxnet-Canadaen_US
dc.subjectRespirationen_US
dc.subjectFenen_US
dc.subjectGrowing season
dc.subjectCO2 exchange
dc.subjectNet ecosystem CO2 exchange
dc.subject.lcshPeatlands--Alberta
dc.subject.lcshPeat bogs--Alberta
dc.titleContrasting responses of growing season ecosystem CO2 exchange to variation in temperature and water table depth in two peatlands in northern Alberta, Canadaen_US
dc.typeArticleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Flanagan-contrasting-responses.pdf
Size:
2.5 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.75 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Flanagan, Larry