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本文应用实验室培养法研究了 Si O3 - Si在胶州湾 1 6个站位沉积物 -海水界面上的交换速率。考虑培养时间、取样时间和间隔等因素 ,采用连续函数的方法计算了 Si O3 - Si交换速率。结果表明 ,Si O3 - Si在胶州湾沉积物 -海水界面上的交换表现为由沉积物向水体的释放 ,交换速率一般在因为 1～5mmol·m-2· d-1范围内 ,平均为 3.3mmol·m-2· d-1。高含量有机质沉积物 ,特别是生物扰动作用可以增大 Si O3 - Si交换速率。考虑胶州湾各种沉积物类型占胶州湾总面积的权重 ,Si O3 - Si在胶州湾沉积物 -海水界面上的交换通量为 1 .0 6× 1 0 9mmol·d-1 ,是河流输入量的 5.3倍 ,可提供浮游植物生长所需硅的 58%。
In this paper, the laboratory culture method was used to study the exchange rate of Si O3 - Si at the sediment-sea interface of 16 stations in Jiaozhou Bay. Taking into account factors such as incubation time, sampling time and interval, the Si O3 - Si exchange rate was calculated by the continuous function method. The results show that the exchange of Si O3 - Si at the sediment-sea interface at Jiaozhou Bay is from sediment to water body, and the exchange rate is generally within the range of 1 ~ 5 mmol · m-2 · d-1 with an average of 3.3 mmol · m-2 · d-1. High organic matter sediments, especially bioturbation, can increase Si O3 - Si exchange rate. Taking into account the weight of all sediment types in Jiaozhou Bay accounting for the total area of Jiaozhou Bay, the exchange flux of Si O3 - Si on the sediment-sea interface at Jiaozhou Bay was 1.60 × 109 mmol · d-1, 5.3 times the amount that provides 58% of the silicon needed for phytoplankton growth.