乳山湾底质中硫化物和氧化-还原电位的分布与变化

2004年6、8和10月分别对乳山湾东流区共进行了3个航次的调查。调查结果表明,乳山湾东流区属于弱还原环境,表层沉积物中硫化物的含量基本呈北侧高、南侧低的趋势,而氧化-还原电位则呈北侧低、南侧高变化趋势。硫化物的垂直分布基本表现为随深度的增加而增加,氧化-还原电位的垂直分布基本表现为随深度的增加而降低。但是,由于受到贝类养殖的影响,出现了较多的例外情况。硫化物含量和氧化-还原电位随季节的变动较明显,硫化物含量8月最高,6月次之,10月最低;而氧化-还原电位则10月最高,6月次之,8月最低。贝类养殖对沉积环境中硫化物与氧化-还原电位有明显影响,养殖区硫化物的含量高于非养殖区,而氧化-还原电位则低于非养殖区。

The distributions and variations of sulfide and redox potential in the sediments of Rushan Bay

Three voyage investigations were conducted in the east flow area of Rushan Bay in June, August and October of 2004, respectively. The results showed that this sea area belonged to the environment of weak redox. The sulfide contents in the surface sediment basically tended to be high in the north and to be low in the south, while the redox potential presented the opposite change tendency. The sulfide contents, in terms of vertical distribution, increased generally with the increase of sediment depth, whereas the redox potential fell with the increase of sediment depth. However, there still existed some more exceptions owing to the effects produced by shellfish culture. In addition, the sulfide contents and redox potentials varied obviously with seasons, the sulfide contents in the three months being in the sequence of August>June>October, while the redox potential values in the three months being in the sequence of October>June>August. Shellfish culture had significant effect on sulfide contents and redox potentials in sediment, resulting in the fact that the sulfide contents in culture area were higher than those in uncultured area, while the redox potentials in culture area were lower than those in uncultured area.