罗源湾水体营养盐的分布与循环

Distributions and Variations of Nutrients at Luoyuan Bay

1986年11月至1987年9月罗源湾水体(NO_3+NO_2),PO_4,SiO_3的平均浓度分别为11.2±6.1,0.69±0.23和21.7±10.5μmol/l。夏季营养盐的分布主要受河流输入控制,冬季氮,磷,硅的分布则分别受外海水的输入,沉积物再悬浮和河流的输入控制。营养盐的收支估算表明:罗源湾营养盐的外部来源较缺乏,生物活动所需的氮,磷,硅分别有 91％,97％和 68％源于水体的再循环。因此,湾内营养盐的再生与循环是维持生产力水平的重要过程。

Distributions of nutrients were observed during November, 1986 to September. 1987 at Luoyuan Bay. The average concentrations of N, P, Si are 11.24±6.1. 0.69±0.23 and 21.6±10.5μmol/l respectively.The distribution features of N, P, Si in different seasons showed their various sources. N seems to be the limited factor for the primary production in July. Evidents from the estimations of the nutrient budgets indicate shortage of external nutrient supplies at Luoyuan Bay. We found that 91. 97 percent of N.P and 68 percent of Si which the primary producers need come from the recycling of the nutrients within the water. Therefore, the regeneration and circulation of the nutrients inside the Luoyuan Bay are most important processes that maintain the productive level.