Methane Emissions from Wetlands in the Midboreal Region of Northern Ontario, Canada

Carbon source/sink function of a subtropical, eutrophic lake determined from an overall mass balance and a gas exchange and carbon burial balance

“…The gaseous carbon fluxes obtained by static chamber technique are somewhat higher than the values from thin boundary layer method, as ebullition is absent in the latter method (Richey et al, 1988;Devol et al, 1990;Bubier et al, 1993). Although there are some shortages of static chamber technique, the gas fluxes are relatively reliable as ebullition is included in this technique.…”

“…Some researches showed that chamber technique overestimates the fluxes relative to the thin boundary layer technique, primarily because the latter only considers diffusion across the airewater interface (Richey et al, 1988;Devol et al, 1990). Similarly, Bubier et al (1993) also suggested the difference between chamber method and thin boundary layer technique results from the absence of ebullition, an important flux mechanism, especially to CH 4 , in the latter method. According to the estimation of a eutrophic lake in Priest Pot, UK, CH 4 92e98% is released by ebullition and CO 2 98.8e99.7% is released by diffusion (Casper et al, 2000).…”

Spatial variations on methane emissions from Zoige alpine wetlands of Southwest China

“…Possible determinants are related to the scale at which these determinants dominate (Klinger et al, 1994). High spatial variability of CH 4 emissions is shown, both among and within sites in many studies (Bubier et al, 1993;Van den Pol-van Dasselaar et al, 1999a,b;Ding et al, 2003). However, research on spatial variations of CH 4 emissions in the spring thaw is uncommon (Melloh and Crill, 1996;Alm et al, 1999).…”

Spatial and temporal variability in CH4 and N2O fluxes from a Scottish ombrotrophic peatland: Implications for modelling and up-scaling

“…MacDonald et al, 1998;Whalen and Reeburgh, 2000;Laine et al, 2007;Roulet et al, 2007). However, with many studies repeatedly reporting high variability in fluxes both within and between sites (Bartlett and Harriss, 1993;Bubier et al, 1993;Waddington and Roulet, 1996), the uncertainty associated with up-scaling chamber measurements to annual catchment budget estimates is often extremely large. Furthermore, such high uncertainty leads to difficulties in identifying the primary drivers of temporal variability and hence predicting future emissions under different climate change scenarios or management regimes.…”