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dc.contributor.authorRinne, Janne
dc.contributor.authorTuittila, Eeva-Stiina
dc.contributor.authorPeltola, Olli
dc.contributor.authorLi, Xuefei
dc.contributor.authorRaivonen, Maarit
dc.contributor.authorAlekseychik, Pavel
dc.contributor.authorHaapanala, Sami
dc.contributor.authorPihlatie, Mari
dc.contributor.authorAurela, Mika
dc.contributor.authorMammarella, Ivan
dc.contributor.authorVesala, Timo
dc.date.accessioned2018-08-29T05:44:31Z
dc.date.available2018-08-29T05:44:31Z
dc.date.issued2018
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/6865
dc.description.abstractWe have analyzed decade‐long methane flux data set from a boreal fen, Siikaneva, together with data on environmental parameters and carbon dioxide exchange. The methane flux showed seasonal cycle but no systematic diel cycle. The highest fluxes were observed in July–August with average value of 73 nmol m−2 s−1. Wintertime fluxes were small but positive, with January–March average of 6.7 nmol m−2 s−1. Daily average methane emission correlated best with peat temperatures at 20–35 cm depths. The second highest correlation was with gross primary production (GPP). The best correspondence between emission algorithm and measured fluxes was found for a variable‐slope generalized linear model (r2 = 0.89) with peat temperature at 35 cm depth and GPP as explanatory variables, slopes varying between years. The homogeneity of slope approach indicated that seasonal variation explained 79% of the sum of squares variation of daily average methane emission, the interannual variation in explanatory factors 7.0%, functional change 5.3%, and random variation 9.1%. Significant correlation between interannual variability of growing season methane emission and that of GPP indicates that on interannual time scales GPP controls methane emission variability, crucially for development of process‐based methane emission models. Annual methane emission ranged from 6.0 to 14 gC m−2 and was 2.7 ± 0.4% of annual GPP. Over 10‐year period methane emission was 18% of net ecosystem exchange as carbon. The weak relation of methane emission to water table position indicates that space‐to‐time analogy, used to extrapolate spatial chamber data in time, may not be applicable in seasonal time scales.
dc.language.isoenglanti
dc.relation.ispartofseriesGLOBAL BIOGEOCHEMICAL CYCLES
dc.relation.urihttp://dx.doi.org/10.1029/2017GB005747
dc.rightsCC BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleTemporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes
dc.description.versionpublished version
dc.contributor.departmentSchool of Forest Sciences, activities
uef.solecris.id56745929en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© Authors
dc.relation.doi10.1029/2017GB005747
dc.description.reviewstatuspeerReviewed
dc.format.pagerange1087-1106
dc.relation.issn0886-6236
dc.relation.issue7
dc.relation.volume32
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessOpen access -julkaisukanavassa ilmestynyt julkaisu


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