厦门西港海域硅酸盐浓度的变化特征

Variation of silicate concentration in Western Xiamen Harbour

对1987年厦门西港赤潮调查表层海水硅酸盐等资料的研究表明，该海区表层海水中硅酸盐浓度的分布一般呈由湾口朝湾内降低的趋势，这在浮游植物繁盛的春季更为明显。硅酸盐浓度的日较差值春季（15．8μmol／dm3）明显高于冬季的（2．5μmol／dm3）。受浮游植物活动和咸淡水消长的综合影响，硅酸盐浓度呈明显的季节变化，介于13．9～72．4）mol／dm3之间，春季为低值期，冬季为高值期。春夏季大、小湖时硅酸盐浓度呈显著变化，一般为小潮时的高于大潮时。文中还给出了赤潮发生期间硅酸盐浓度的变化。

This paper presents the distribution and variation of silicate concentration in surface Western Xiamen Harbour, and discusses the effects from phytoplankton, and varitions of sea water and frseshwater.The general distribution trend of silicate concentration decreases from bay mouth to bay head, especially obviours in the phytoplankton bloom in spring. The diuarnal change of silicate in spring was obviours, of which variation degree reached 15. 8μmol/dm3 per day, and becauce evidently weaker in winter, which was only 2. 5μmol/dm3. Due to joint effects of phytoplankton activity and the growth and decline of seawater and freshwater, the seasonal change of silicate concentration was also evident fairly, of which the change ranged within 13. 9 ~ 72.4 μmol/dm3, and low and high concentration of silicate occurred separatly in spring and winter.It was also observed that the variation of sillcate concentration between spring and neap tides, and that of silicate concentration during red tide event.