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| 基金项目:国家重点自然科学基金项目，中国科学院知识创新工程方向项目，国务院三峡工程建设委员会资助项目 |
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| Distribution and variation of silicate in the Changjiang estuary and its adjacent waters |
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Pan Shengjun1,2, Shen Ziliang3
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1.Key laboratory of Marine Ecology and Environmental Science,Institute of Oceanology,Chinese ,Academy of Sciences;2.Graduate University of Chinese Academy of Sciences;3.Key laboratory of Marine Ecology and Environmental Science,Institute of Oceanology,Chinese ,Academy of Sciences
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| Based on the data obtained from quarterly investigations in the Changjiang estuary and its adjacent sea areas in 2004,the distributions and variations of SiO3-Si are discussed. The reslts show that the concentrations of SiO3-Si were higher near the changjiang estuary and lower outside ghe sea.Generally,the concentrations of SiO3-Si were higher in the surface than in the buttomin shore;the opposite distributions off shore.The SiO3-Si concentrations both inside and outside the mouth in summer and autumn were higher than those in spring and winter.Distributions of SiO3-Si varied with increase and decrease of runlff and with enlarge and reduce of the extent of Changjiang dilution water.The concentrations of SiO3-Siin May were relatively less because of phytoplankton blooming. The seasonal variations of SiO3-Si/DIN and SiO3-Si/PO4-P ratios were mainly controlled by the variations of SiO3-Siconcentrations. Compared with the data of 1985-1986, the concentrations of SiO3-Sihave inereased2.3 times,both SiO3-Si DIN and SiO3-Si/PO 4-P ratios have ascended 1.6 and2.5 times respectively, which depended on the increasing of the SiO3-Si concentrations,May is the fitting season of phytoplankton blooming compared with other seasons,in which it is the relaively least that SiO3-Si/DIN and SiO3-Si/PO 4-P ratios departure from Redfield ratios. The removals of SiO3-Siin the estuary showed that aside from biological removal, there was a main effect coming from seawater dilution. |
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