Biogeochemical Characteristics of Organic Carbon in Sediment

2 Contribution of the Changjiang River to Organic Matter in Sediments 

Some of the marine source organic matter originates from native biological production, and others may derive from biological productivity transported from other sea areas. 

In the ECS, benthic fluxes from muddy shelf sediments are larger than those from sandy shelf sediments (Kato and Terumuma, 1995). Benthic fluxes are influenced by the oxygen concentration of surrounding water and sediment physical properties, such as water content, grain size. Benthic fluxes of total carbon on the shelf increase rapidly with an increase in surface sediment water content. 

Mid-oufer shelf sediments Inner-shelf sediments Near shore sediments 

It was found that both sediment and organic carbon accumulation rates are the highest in the inner shelf area (1.8 g C/(cm -yr) and 3.1 mg C/(cm -yr) for sediment and organic carbon accumulation rates, respectively). Sediment accumulation rates decreased offshore, whereas organic carbon accumulation 

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