Position: Home > Articles > The influence of environmental factors on the silicon concentration in the freshwater-seawater mixing plume at the Changjiang Estuary
Progress in Fishery Sciences
2014,35
(3)
27-33
环境因子对长江口咸淡水混合水体中硅酸盐浓度的影响
作 者：
杜锦;石晓勇;陈鹏;张传松
单 位：
中国烟台赫尔曼格迈纳尔中学;中国海洋大学化学化工学院
关键词：
硅酸盐(SiO3-Si);长江口;咸淡水混合;稀释模式;迁移转化
摘 要：
通过室内培养实验,模拟了不同条件下(水体盐度、温度、pH值、富氧缺氧等)长江径流淡水和东海外海水的混合过程,初步了解了上述主要环境因子对长江口硅酸盐(SiO3-Si)混合模式的影响。结果表明,在实验条件下:1)长江淡水(包括已滤和未滤)与外海水在混合过程中,SiO3-Si浓度在大约40 h后可基本达到平衡。2)混合水体中SiO3-Si浓度与其盐度表现出良好的负相关关系,长江口SiO3-Si浓度主要受物理混合稀释影响,已滤长江淡水与未滤长江淡水同外海水混合,二者混合水体中SiO3-Si浓度随盐度的变化无显著差异。实验条件下,水体泥沙等颗粒物的存在对SiO3-Si在稀释过程中的浓度没有显著影响。3)随着混合水体温度升高,其SiO3-Si浓度略有升高,表明长江冲淡水对外海海域SiO3-Si的补充存在季节性差异。4)pH为4-8时,混合水体中SiO3-Si浓度相差不大,pH=10时,SiO3-Si浓度发生改变,可能是悬浮颗粒物对SiO3-Si的解吸增加、pH影响了SiO3-Si的存在形式。5)在富氧和缺氧状态下长江淡水同外海水混合,混合水体中SiO3-Si浓度无显著差异。
译 名：
The influence of environmental factors on the silicon concentration in the freshwater-seawater mixing plume at the Changjiang Estuary
作 者：
DU Jin;SHI Xiao-yong;CHEN Peng;ZHANG Chuan-song;College of Chemistry and Chemical Engineering,Ocean University of China;National Marine Hazard Mitigation Service;Hermann Gmeiner School;
关键词：
Silicon(SiO3-Si);;Changjiang Estuary;;Freshwater-seawater mixing plume;;Dilution mode;;Migration and transformation
摘 要：
In order to study the migration,transformation,and the dilution mode of nutrients in the freshwater-seawater mixing plume at the Changjiang Estuary,we simulated environmental factors in the laboratory,such as salinity( S),temperature( T),pH,and dissolved oxygen( DO),and explored their influences on the silicon( SiO3-Si) concentration in the mixing plume of the diluted Changjiang River water and the external seawater. Our results and their implications are:( 1) whenthe external seawater was mixed with either filtered or unfiltered diluted Changjiang River water,the concentration of SiO3-Si stabilized after 40 h.( 2) The SiO3-Si concentration in the freshwater-seawater mixing plume showed a clear negative correlation with the salinity,indicating that the SiO3-Si concentration at the Changjiang Estuary was mainly affected by the physical mixing dilution. In the mixture of the external seawater and the diluted Changjiang River water,the concentration of SiO3-Si showed no significant difference no matter whether the Changjiang River water was filtered,which suggested that the suspending particles in the water had no effect on the SiO3-Si concentration in the freshwater-seawater mixing plume.( 3) The concentration of SiO3-Si slightly increased as the temperature of mixed water rose. This implied that there may be a seasonal change in the flow of SiO3-Si from the diluted Changjiang River water to the offshore area of the East China Sea.( 4) The SiO3-Si concentration in the mixed water remained unchanged at pH 4- 8,but altered when pH was 10. Simple explanations were that higher pH enhanced the SiO3-Si desorption by suspending particles,or changes in the pH affected the form of SiO3-Si.( 5) The oxygen levels( anoxia or oxygen-enriched state) did not affect the SiO3-Si concentration.
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