渤海湾天津近岸海域首次棕囊藻赤潮初探

摘要

In this paper, the series data of dynamic chasing monitor to the first Phaeocystis globosa Scherffel red tide in Tianjin coastal sea areas of Bohai Bay in 2006. It is found that: (1) A sudden eruption of the first Phaeocystis globosa Scherffel red tide causes less damage to marine life. To a certain extent, a conclusion from the laboratory experiment was validated that the Phaeocystis globosa Scherffel cells in lower temperature waters accumulated rapidly to the climax, but it also decreased the yield of the toxin and lightens its toxic action. (2) The occurrence of Phaeocystis globosa Scherffel red tide consumes a large quantity of nutrients and this releases the serious eutrophication to some degree. The concentration's changes of nitrate and phosphate are the limiting nutritive factor and they preferably reflect the progress of the red tide. (3) The ration's unbalance of N, P and Si urged by the quick-rising of the inorganic nitrogen and the serious eutrophication status are the main reasons of this red tide.Therefore, further strengthening the supervisory to the discharge of the land-sourced pollutants is rather important to alleviate the serious eutrophication phase and to reduce the probability of the red tide's occurrence once again.%利用2006年渤海湾天津近岸海域首次棕囊藻赤潮各发生区域动态应急监测资料,对其水体理化参数进行了分析.主要得出如下结论:(1)渤海湾天津近岸海域首次爆发的相对低温条件下棕囊藻赤潮虽然来势凶猛,但对区域生物并没有造成明显毒害影响,一定程度上佐证了低温条件下棕囊藻细胞数量积累迅速但合成毒素的数量却相对较少的实验室研究结论.(2)棕囊藻赤潮的发生消耗了水体中大量的营养盐,一定程度上缓解了区域水体富营养化状况,水体中硝酸盐和活性磷酸盐是赤潮的限制营养因子,其浓度变化较好地反映了本次棕囊藻赤潮发生、发展及消亡的迁移路线图.(3)水体中高含量无机氮所造成的区域营养盐比例的失衡和水体严重富营养化是本次棕囊藻赤潮发生的主要原因.因此加强对陆源污染物排放的监控从而减轻日趋严重的海水富营养化,对于降低棕囊藻赤潮的发生可能性和提供一个健康的生态环境至关重要.