Methane Flux From Mangrove Sediments Along the Southwestern Coast of Puerto Rico

摘要: Although the sediments of coastal marine mangrove forests have been considered a minor source atmospheric methane, these estimates based on sparse data from similar areas. We gathered evidence that shows external nutrient and freshwater loading in may significant effect methane flux. Experiments were performed to examine fluxes anaerobic forest subjected secondary sewage effluents southwestern coast Puerto Rico. Emission rates measured situ using static chamber technique, subsequent laboratory analysis samples was by gas chromatography flame ionization detector. Results indicate flux lowest at landward fringe nearest effluent discharge, higher seaward occupied red mangroves, highest transition zone between black communities, with average values 4 mg CH4 m−2 d−1, 42 82 respectively. Overall mean show emit as much 40 times more than unimpacted pristine Pneumatophores ofAviciennia germinans found serve conduits atmosphere for this gas. Fluctuating water level overlying sediment is an important environmental factor controlling seasonal interannual variations. Environmental controls such inputs increased influence emissions environments.