Abstract:Forty-eight surface sediments in the South Yellow Sea were obtained by grab-sampler in April 2001. They were sieved into three size groups: >63μm (coarse-grained sediment), 31~63μm (medium-grained) and <31μm (fine-grained) by two different meshes (#250 and #500) using filtered (0.45 μm) seawater. Four forms of transferable nitrogen (ion-transferable nitrogen (IEF-N), weak-acid extractable nitrogen (WAEF-N), strong-alkali extractable nitrogen (SAEF-N) and strong-oxidant extractable nitrogen (SOEF-N)) in diff...