Soil interstitial CH4 concentration was a dominant
controlling factor in CH4 emissions, particularly
during the later season (July and August). During this
period, the relationship between conductance and
interstitial CH4 was strong (r 2=0.93 for incorporated
and r 2=0.83 for burned) and diered between burned
and incorporated plots (Fig. 7), such that incorporated
plots had a higher conductance per unit of interstitial
CH4.
Cumulative CH4 emissions were plotted against
available organic carbon from the 58 d laboratory in-
cubation in order to examine the relationship between
available soil organic matter and seasonal emissions
(Fig. 8). Although the variability in available organic
carbon, particularly in the straw burned treatment
plots was low, it is apparent that at similar amounts of