Abstract:Determination of the CH 4 flux from the reed wetland of Liaohe delta, China using closed chamber technique showed that the emission of CH 4 from the reed wetland had a significant seasonal variation. Before irrigation, wetland soil absorbed CH 4.Higher emission rate of CH 4 occured durin the flooding period. And after drainage, CH 4 emission decreased significantly. CH 4 flux from reed wetland ecological system during the period of measurement was -968~2734μgCH 4/(m 2·h). In addition, CH 4 rel...