Emission of Methane and Nitrous Oxide by Australian Mangrove Ecosystems

摘要: : The fluxes of the greenhouse gases methane (CH4) and nitrous oxide (N2O) were measured in mangrove wetlands Queensland, Australia, using closed chamber technique. Large differences both from different study sites observed, which presumably depended on substrate availability. CH4 emission rates range 20 to 350 μg m-2 h-1, whereas N2O lower, amounting - 2 14 h-1. In general, field with high availability showed higher emissions than poor nutrient supply. This assumption is supported by observation dramatically increased (150 400 h-1) if artificially fertilised additional N. As expected, N fertilisation did not alter during period investigation. present study, it was confirmed that vegetation may play a role as transport path for facilitating diffusion out soil. Prop roots Rhizophora stylosa emitted at 2.6 3.3 root surface respectively, soil this stand acted sink CH4. consequence, ecosystem whole could constitute source despite uptake contrast prop roots, presence pneumatophores Avicennia marina led significant increase soils, but enhance emissions. These findings indicate ecosystems be considered anthropogenic input into these will lead enhanced strengths. For an up-scaling gas forests global scale, more information needed, particularly significance vegetation.