厦门西港引发有害硅藻水华磷的阈值研究

STUDY ON THE PHOSPHORUS EXTREME VALUE WITH A HARMFUL DIATOM BLOOM OCCURRENCE IN WESTERN XIAMEN HARBOUR

1995年10月，在厦门市国家海洋局第三海洋研究所的陆基水池中，应用海洋围隔生态系实验技术，研究了在无海流、盐度等因子干扰的情况下，磷的形态、分布及其与浮游植物生物量的相关性。结果表明，海水中的可溶性无机磷（DIP）随时间里指数函数减少。浮游植物生物量主要与可溶性无机磷密切相关：[Chl－a]=A×e-B[PO4]，这种相关的浮游植物生物量表现2d左右的滞后现象。还探讨了限制浮游植物增殖的DIP的最低浓度为0．3－04μmol／L，从DIP表现浓度估算浮游植物可能达到的最大生物量为[Chl－a]=10mg／m3，并由此估算出引发中肋骨条藻赤潮的DIP的阈值为1．2μmol／L，作为赤潮预测预报的参考。

An experimentri enclosed marine ecosystem in a land-based tank on the shore of westem Xiamen harbor was used to study the states and distribution of phosphorus and their relation with phytoplankton biomass under normal condihons of salinity and hdal current in Oct., 1995. The result shows tha dissolved inorganic phosphorus (DIP)in seawater decreased exponentially with time and is closely related to phytoplanktonic biomass. A relationship:[Chl-a] = A ｘe-B[PO4] (A = 16.6,B = 1.37), was derived in thes experiment The phytoplanktonic biomass logged DIP content by about 2 days. The lowest DIP concentration limiting phytoplanktonic multiplication was 0.3-0.4μmol / L, the eshmated maximum phytoplanktonic biomass ([Chl-a] = 10mg / m3) could be produced from the external DIP concentration supplied, and the minimum DIP external concentration for occurrence of the letonema costlum harInfu bloom is 1.2μmol / L, a value which can serve as criterium for forecashng the harmfu bloom of diatoms.