Methane flux from rainforest soils in northeast Queensland, Australia, was investigated using a combination of laboratory, field and simulation modelling. In aerobic laboratory incubations, CH 4 uptake in the top 0.1 m of the soil (−2.5 to −7.3 μg CH 4 kg −1 SDW day −1 ) is approximately one order of magnitude higher than CH 4 production under anaerobic conditions. The highest CH 4 uptake, as well as potential CH 4 production is found in the uppermost C rich soil layers. Detailed measurements from three contrasting rainforest sites identified the soils to be functioning as sinks for atmospheric CH 4 . Fifteen months continuous measurement at one of the lowland rainforest sites showed that the seasonality of CH 4 uptake was mainly driven by changes in soil moisture rather than by temperature changes. Maximum CH 4 uptake (109 μg CH 4 m −2 h −1 ) was observed during dry season conditions, whereas during the wet season, CH 4 uptake decreased significantly to near zero. Based on our laboratory experiments and on published literature we developed a semi-empirical CH 4 module for the biogeochemical model ForestDNDCtropica. Tests at several sites showed the robustness of our modelling approach with mean simulated values within 12% of observed values. To estimate regional CH 4 uptake by rainforest soils in the region of the 'Wet Tropics', Queensland, Australia, we linked CH 4 uptake and production algorithms to a regional GIS database. We estimated that the lowland and montane rainforest soils in northeast Queensland, Australia, were a net sink for CH 4 with a mean uptake rate of −2.89 kg CH 4 ha −1 year −1
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