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We monitored CO2 and CH4 fluxes using eddy covariance from 19 Mayto 27 September 2011 in a poor fen located in northern Michigan. Theobjectives of this paper are to: (1) quantify the flux of CH4 from asub-boreal peatland, and (2) determine which abiotic and biotic factors werethe most correlated to the flux of CH4 over the measurement period. Netdaily CH4 fluxes increased from 70 mg CH4 m−2 d−1 to220 mg CH4 m−2 d−1 from mid May to mid July. After July,CH4 losses steadily declined to approximately 50 mg CH4 m−2 d−1 in late September.During the study period, the peatland lost17.4 g CH4 m−2. Both abiotic and biotic variables were correlatedwith CH4 fluxes. When the different variables were analyzed together,the preferred model included mean daily soil temperature at 20 cm, daily netecosystem exchange (NEE) and the interaction between mean daily soiltemperature at 20 cm and NEE (R2 = 0.47, p value < 0.001). Theinteraction was important because the relationship between daily NEE andmean daily soil temperature with CH4 flux changed when NEE was negative(CO2 uptake from the atmosphere) or positive (CO2 losses to theatmosphere). On days when daily NEE was negative, 25% of the CH4flux could be explained by correlations with NEE, however on days when dailyNEE was positive, there was no correlation between daily NEE and theCH4 flux. In contrast, daily mean soil temperature at 20 cm was poorlycorrelated to changes in CH4 when NEE was negative (17%), but thecorrelation increased to 34% when NEE was positive. The interactionbetween daily NEE and mean daily soil temperature at 20 cm indicates shiftingenvironmental controls on the CH4 flux throughout the growing season

Shifting environmental controls on CH&lt;sub&gt;4&lt;/sub&gt; fluxes in a sub-boreal peatland

Shifting environmental controls on CH<sub>4</sub> fluxes in a sub-boreal peatland