Laboratory Simulation on Phosphorus Releasing near the Water/Sediment Interface

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Laboratory Simulation on Phosphorus Releasing near the Water/Sediment Interface in the East China Sea off the Changjiang Estuary

Surface sediment samples taken from the East China Sea off the Changjiang estuary are used as raw materials for phosphorus releasing experiment. It is found that after being thoroughly mixed with seawater for about 10 minutes, phosphorus released from the sediments reaches its maximum value. Adsorption kinetics can be fitted with both Elovich equation and two-constant rate equation. The releasing amount is closely related to the composition of the sediments. Phosphorus release from silty and muddy sediment is higher than from that dominated by sandy composition. For the desorption reaction, iron-phosphorus (Fe-P) is the most active one, with a releasing ratio higher than other phosphorus forms,followed by absorbed-phosphorus (Ad-P) and organic bound phosphorus (OP). All of them can be referred to as bio-available phosphorus. The results demonstrate that phosphorus in sediments can be released into seawater under suitable hydrodynamic conditions, and have a great impact on the nutrition state and primary productivity of marine biosphere.

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作 者: 郑丽波 周怀阳 叶瑛  
作者单位:郑丽波(Geographical Department, East China Normal University, Shanghai 200062, China)
[ Q)A3AD-FT1@0周怀阳(Second Institute of Oceanography, SOA, Hangzhou 310012, Zhejiang, China)
t2[3E@6I2g+C'e3ln0叶瑛(Department of Earth Sciences, Zhejiang University, Hangzhou 310027, Zhejiang, China) 
刊 名:海洋通报(英文版) 
英文刊名:MARINE SCIENCE BULLETIN 
年,卷(期):2004 6(1) 
分类号: 
关键词:off Changjiang estuary   East China Sea   sediments   phosphorus release   simulating experiment  
机标关键词:the Changjiang Estuaryhydrodynamic conditionsthe Changjiang estuaryprimary productivitythe East China Searate equationmaximum valuematerials for 
基金项目: 
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