海洋原甲藻与三角褐指藻混合培养条件下的种群生长与氮磷营养盐变化

以三角褐指藻(Phaeodactylum tricornutum Bohl)和海洋原甲藻(Prorocentrum mi-cans)为实验种研究了硅藻与甲藻在混合培养的环境中其各自的种群密度变化以及相应水体中氮磷营养盐变化。结果显示,在单独培养或与海洋原甲藻共同培养的条件下,三角褐指藻均表现出明显的营养盐吸收优势,种群生长迅速。相对而言,海洋原甲藻对营养盐的吸收速率明显较低,而且在与三角褐指藻共同培养的水体中一直处于竞争劣势;但有海洋原甲藻存在的水体中,三角褐指藻较单独培养时具有更高的生长速率和高的生物量,海洋原甲藻的存在可能促进三角褐指藻的生长。

The population growth and variation of nitrate-N and phosphate-P in the mix-culture of Phaeodactylum tricornutum Bohl and Prorocentrum micans

The relationship between diatom and dinoflagellate while being cultivated together was studied by using Phaeodactylum tricornutum Bohl and Prorocentrum micans as the target species.The result indicated that P.tricornutum Bohl had a competition advantage of absorbing both nitrate-N and phosphate-P compared with that of P.micans.P.tricornutum Bohl had a larger growth rate and could reach larger biomass when cultivated with P.micans than that of being cultured alone.The growth of P.micans can be restrained when cultivated with P.tricornutum Bohl.