Carbon and nutrient cycling in seagrass meadows, Sulawesi, Indonesia

The study was conducted in 3 seagrass beds in Awerange Bay during the dry season (September 2006) and the wet season (March 2007).Densities of seagrass (shoots m-2) and production in(g DW m-2 d-1) were calculated.pH and redox potential were measured. Water content, total C, total N, TOC and total P were determined, and total inorganic carbon calculated.Rates of sulfate reduction were measured.Solute fluxes of DIC, O2, and dissolved inorganic nutrient and other solute (Ca, Fe, Mn, hydrogen sulphide) across the sediment-water interface were measured.Net ammonium production was measured from each site.Denitrification was measured using the N2-gas technique. Fluxes of methane and N2O were measured. Nitrogen fixation in sediments was also measured.Benthic microaglal production was measured by oxygen fluxes in the dry and wet seasons. To examine sediment carbon and nitrogen cycling in seagrass meadows across a gradient of increasing cabonate content.