摘要
通过一个完整的骨条藻赤潮发生过程（起始─—发展─—维持─—消亡），研究水体中Ｆｅ、Ｍｎ含量的变化及其与赤潮发生的关系。结果表明：（１）表层水中，赤潮发生的起始阶段Ｆｅ、Ｍｎ浓度很高，分别为大于１７．８μｍｏｌ／Ｌ和０．５１μｍｏｌ／Ｌ．随着骨条藻的增殖，藻类细胞的增加，Ｆｅ、Ｍｎ含量下降，赤潮消失后，水体中Ｆｅ含量回升：Ｍｎ含量仍保持低浓度（未检出）．（２）４ｍ层水体中，在起始和维持两阶段，Ｆｅ、Ｍｎ含量均较高，其它与表层水一致．（３）底层水体，在起始阶段，Ｆｅ、Ｍｎ含量比表层和４ｍ层的要高，赤潮消失后，Ｆｅ、Ｍｎ含量均回升。可见，水体中Ｆｅ、Ｍｎ含量的异常升高，可能是诱发骨条藻赤潮的因子之一。赤潮发生过程中，Ｆｅ、Ｍｎ含量的变化是藻类对其吸收利用所致。每年５月到８月，为长江丰水期，迳流携带Ｆｅ、Ｍｎ入海的量也大，这可能是造成长江口外赤潮多发的原因之一。
The relatiomhip between the changes of conccntration of Fe、Mn and occuncnce ofSkeletonema costatum red tide was studied. The results show that:(1)The concentrations ofFe、Mn in surface water are very high during the starting stage of red tide,they are over 17.8and 0.51 μmol·L￣(-1),respedively.The concenthetions of Fe、Mn reduce gradually withincreasing the number of S.castatum cells.The concentration of Fe will increasa and Mn can'tbe deteded in surface water after the red tide disappears.(2)The concentrations of Fe、Mn in4m layer water are high during the starting and sustaining stage,(3)The coccntmtions ofFe、Mn in bottom water are higher than that of surface water and 4m layer water during thestarting stage. The concentrations of Fe、Mn will increase after the red tide disappears. Theextraordinary high conoentrations of Fe、Mn in water is one of the factors of inducing the oc-currence of S.costatum red tide.The changes.of concentrations of Fe、 Mn are causedby assimilating of S.costatum cell during the processes of the red tide.
出处
《暨南大学学报（自然科学与医学版）》
CAS
CSCD
1995年第1期131-136,149,共7页
Journal of Jinan University(Natural Science & Medicine Edition)
基金
国家自然科学基金资助重大项目
关键词
赤潮
中肋骨条藻
铁
锰
微量元素
red tide
Skeletonema costatum
iron manganese
