南海北部秋季营养盐、溶解氧、pH值和叶绿素a分布特征及相互关系

Distribution of Macro-nutrients,Dissolved Oxygen,pH and Chl a and Their Relationships in Northern South China Sea

通过2004年9月至10月对南海北部水域的现场调查,分析了表层海水中溶解氧、叶绿素a、pH值和营养盐等水质因子的空间分布分布特征,并讨论了它们之间的相互关系。结果表明:在南海北部海区的表层海水中,各水质因子在空间分布上大多呈现块状分布,且东西两侧的海水有较为明显的差异;海水中的溶解氧、pH值均表现出与海水温度相反的分布趋势;海水中的叶绿素a(Chla)和众多的水质因子表现出多元相关性,说明水体中浮游植物的生长繁殖是众多水质因子在南海北部综合作用的结果,而Chla和水体中亚硝酸盐的高相关性,说明南海北部水体中浮游植物的生长和亚硝酸盐有着比其他营养盐因子更为密切的联系。

Surface seawater environmental parameters in northern South China Sea, including temperature, salinity, macro-nutrient （ i.e. NO2-N, NO3-N, NH3-N, SiO4, and PO4）, dissolved oxygen, and pH levels were investigated in September and October, 2004, their distributions were characterized and the relationships among these parameters were analyzed. It was found that most of these factors distributed in patchness, and the west water body is obviously different from the east in terms of these parameters. The dissolved oxygen and pH have opposite distribution to the water temperature. Chl a can be regressed linearly to these factors, which suggested that the growth and development of phytoplankton in northern South China Sea is the overall effects of these factors. However, Chl a is most linearly closed to the contents of NO2 in the surface seawater of northern South China Sea, which suggested that the growth and development of phytoplankton is related tightly to NO2 levels there.