南海神狐海域亚硝酸盐垂直分布特征及影响因素

VERTICAL DISTRIBUTION PATTERN AND INFLUENCE FACTORS OF NITRITE IN SHENHU AREA, SOUTH CHINA SEA

摘要: 对南海神狐海域亚硝酸盐垂直分布进行了调查研究，探讨了亚硝酸盐分布规律的影响因素，结果表明，亚硝酸盐含量在水深75~100 m处出现最大值，含量范围为0.136~0.260 μmol·L^-1, 其他水层含量均＜0.005 μmol·L^-1。与之相关的铵盐和硝酸盐却没有相似的分布规律，铵盐含量在整个水层中没有明显的分布规律，硝酸盐的含量随水深增加而增大。鉴于此，又对和其相关的物理、化学参数做了分析，发现亚硝酸盐独特的分布规律受铵盐浓度、温度、酸度、溶解氧含量、有机物含量等多种因素影响。

Abstract: Vertical distribution pattern of nitrite and its influence factors were studied in Shenhu Area, South China Sea. The maximum of nitrite in concentration of 0.136-0.260 μmol·L^-1 appears within the depth between 75 to 100 meters, and in the other ranges, the concentration is less than 0.005 μmol·L^-1. However, there is no similar distribution patterns for either ammonium salt or nitrate. The distribution pattern of ammonium salt is not obvious, and nitrate increases with water depth. Further study of physical and chemical factors reveals that the distribution of nitrite is influenced by the concentration of ammonium salt, temperature, dissolved oxygen, acidity, organic content and others.