围隔体内赤潮对扰动的反应

RESPONSE OF RED TIDE TO WATER STIRRING IN MARINE ENCLOSURE

于1992年9—12月，使用中尺度围隔装置（1．7m3）研究扰动的水体对赤潮浮游植物种类演替的影响。实验结果表明，对富营养化的围隔水体进行扰动可以改变水体中赤潮生物的演替次序，即甲藻和鞭毛藻往往出现在硅藻赤潮之后。本文从另一方面证明，富营养下的相对稳定水体有助于鞭毛藻类赤潮的形成。

This experiment was conducted in two 1.7m3 enclosures in the land-based tanksin the 3rd Institute of Oceanography, SOA, in Xiamen in September-December of1992. The response of succession of phytoplanktonic bloom was studied with andwithout disturbance in the water columns, kept eutrophic by moderate enrichmentsof nitrite, nitrate, phosphate and silicate above the level of these nutrients in Xiamen waters. The resutls showed that in the unstirred water column algal successionwas dominated by diatoms, dinoflagellates and microflagellates in order while thestirred water column underwent a diatom (Nitzschia clostcrium) bloom (highestpeak of 2×104 cells/cm3) till the end of the experiment. The experiment demonstrate again that, with a stable and eutrophicated water column, flagellate bloom orred tide may easily occur.