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《Acta Scientiae Circumstantiae》 2001-04
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Dynamic analyses on algal bloom events in Daya Bay of Guangdong province Ⅱ. A study of relationship between algal bloom and nutrients

XU Ning, CHEN Jufang, WANG Zhaohui, HUANG Weijian, XIE Longchu, QI Yuzao\ (Institute of Hydrobiology, Jinan University, Guangzhou 510632, China)  
Investigation on the phytoplankton of Daya Bay in Aotou, Guangdong province, were carried out from January to December 1998 the samples were collected from six sampling stations once every three days. Water temperature, salinity, irradiance of light, pH, DO, chlorophyll a, COD Mn , turbidity, NO - 3 N, NH + 4 N, NO - 2 N, PO - 4 P, dissolved Fe, Mn and Si were determined synchronized with phtoplankton from April to June, once a month in other months. Four algal bloom events occurred successively in Daya Bay in 1998. The causative organisms were \%Asterionella japonica, Thalathiosira subtilis, Gymnodinium\% spp. and \%Chaetoceros\% spp, respectively. The functions and mechanisms of various nutrients in the processes of the blooms were analysed. The studies revealed that requirements of different algae for DIN and DIP are not the same. The algae have selectivity on absorbing NO - 3 N、NH + 4 N and NO - 2 N. Exceeding increase in the concentration of DIP and dissolved Fe are the induced factors of the blooms. It's an important factor linked with the end of the blooms that DIP and dissolved Fe are used up.
【Fund】: 国家自然科学基金 (39790 110 )
【CateGory Index】: X55;X172
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