舟山朱家尖海域角毛藻赤潮与环境因子关系的研究

Study on correlation of Chaetoceros red tide and environmental factors in Zhujiajian area

2007年7月22日舟山市朱家尖东部海域首次发生大规模的扁面角毛藻和旋链角毛藻赤潮,通过对此次赤潮的跟踪监测,研究了赤潮发生和理化因子的关系,研究结果表明:降雨引起的盐度较大幅度的降低是赤潮爆发的诱导因素之一,适宜的水文气象条件、富营养化的海域是赤潮爆发的基础,赤潮的发生致使海域的pH、溶解氧等因子发生了变化,此次角毛藻赤潮主要吸收NO3-N和S iO3-S i,PO4-P是其生长的限制因子。

A bloom caused by Chaetoceros compressus and Chaetoceros curvisetus was first found in east of Zhujiajian island archipelago in Jul. 22, 2007. According to the study, the result showed that sharp fall of salinity by the rainfall is the inducement factor for the red tide, the suitable hydrograph-meteorological condition, eutrophication area are the base factor for red tide. pH, DO ect. varied with the process of red tide. In this case, the bloom algae absorbed mainly nitrate nitrogen and silicate, and phosphate is the limited factor.