抄録
Nutrients and Hydrogen sulfide fluxes from a benthic sediment becomes important causes on water pollution in a coastal environment. To understand the mechanism how these benthic fluxes are controlled, we performed a numerical experiment by using the CANDI model that can simulate the diagenetic processes in the sediment. The model results showed that an organic matter provided to a sediment from water column is decomposed by bacteria which uses O2, NO3. MnO2. Fe(OH)3. and SO4 as a substrate. Especially the fraction of decomposition process using SO, as a substrate occupied 70% of all processes, which suggested an anaerobic environment in the sediment. The main factor that determines whether an environment in the sediment is aerobic or anaerobic is a sinking flux of an organic matter from water column. To keep an aerobic environment in the sediment, it is necessary to reduce the sinking flux of organic particulate matter.
