不同氮磷比对福建沿海米氏凯伦藻生长的影响

The effects of nitrogrn to phosphorus ratio on the growth of Karenia mikimotoi separated from Fujian coastal area

本文在不同氮磷比(N∶P=4∶1、8∶1、16∶1、32∶1、80∶1)培养条件下,对福建沿海赤潮海域分离的米氏凯伦藻(Karenia mikimotoi)进行培养,研究其生长特性。实验结果表明:不同的氮磷比对米氏凯伦藻的生长有明显的影响。过高或过低的氮磷比均不适合米氏凯伦藻的生长,该藻在N∶P=32∶1条件下比生长率最快,为0.33 d-1。米氏凯伦藻对氮的需求高于磷,在适当的磷限制环境中能够维持更长的生长周期。引发赤潮的主要原因并不是由于米氏凯伦藻赤潮暴发海域的低氮磷比,而是赤潮暴发过程中,米氏凯伦藻对营养盐的大量消耗,尤其是对氮的消耗。

The growth character of Karenia mikimotoi was studied in culture medium at different ambient ratios of N/P（ 4∶ 1,8∶ 1,16 ∶ 1,32 ∶ 1,80 ∶ 1）. The results showed that N/P ratio significantly affected the growth of Karenia mikimotoi. Too high or too low N/P ratio was not suitable for Karenia mikimotoi growth.The algae grew fastest under 32 N/P ratios,and the maximum specific growth rate was 0. 33 d-1. Karenia mikimotoi demanded more nitrogen than phosphorus for growth,and it could maintain a longer growth cycle in the appropriate phosphorus limited environment. The main reason of Karenia mikimotoi red tides was not the low N/P ratio in the environment,but was a large number of nutrient consumption,especially nitrogen.