米氏凯伦藻与亚心形扁藻在不同营养盐水平下的种间竞争  

Inter-specific competition of Karenia mikimotoi and Platymonas subcordiformis under different level of nutrients

作　　者：马龙[1,2] 王培刚[1,2] 朱葆华[3] 潘克厚[3] 

机构地区：[1]山东省海洋生态环境与防灾减灾重点实验室,山东青岛266033 [2]国家海洋局北海海洋技术保障中心,山东青岛266033 [3]中国海洋大学水产学院,山东青岛266003

出　　处：《海洋环境科学》2013年第2期221-226,共6页Marine Environmental Science

基　　金：国家重点基础研究发展计划项目(2011CB200901);国家自然科学基金资助项目(40976076)

摘　　要：研究了在不同营养盐水平下米氏凯伦藻(Karenia mikimotoi)与亚心形扁藻(Platymonas subcordiformis)的生长竞争关系。结果表明:(1)单种培养体系中,米氏凯伦藻与亚心形扁藻的K值和r值均随环境中N、P营养盐浓度增加而增大。米氏凯伦藻的生长受P限制作用较为明显,且较高或较低的N/P均不适宜米氏凯伦藻生长,N/P为24.4是该藻生长的最佳值。(2)共培养体系中,在各种营养盐水平下米氏凯伦藻均受到亚心形扁藻显著的抑制作用(P<0.5)。在营养盐较为充分的组分中,米氏凯伦藻在实验进行至7～9 d几乎全部死亡;而在营养盐极度限制的组分,虽然至实验结束米氏凯伦藻没有完全死亡,但其密度仅为初始接种密度的0.8～3倍。The competitive effects of Karenia mikimotoi and Platymonas subcordiformis under the different level of nutrients were studied.The results show that（1） Under the single-cultured conditions,the K and r value of K.mikimotoi and P.subcordiformis were increased with N,P nutrient concentrations increasing.The P restrictive effect to the growth of K.mikimotoi is more obvious.It is not suitable for the growth of K.mikimotoi whenever the value of N/P is higher or lower,and 24.4 is the best value for the microalgae growth.（2） Under the co-cultured conditions,the growth of K.mikimotoi is inhibited by P.subcordiformis during every level of nutrients（P0.5）.In the more abundant nutrient components,all of K.mikimotoi is dead after 7~9 days.However,K.mikimotoi is not completely dead,but its density is only 0.8~3 times than the initial inoculation density in the extreme shortage of nutrient components.

关 键 词：米氏凯伦藻 亚心形扁藻 营养盐竞争 共培养体系 种间竞争 

分 类 号：Q945.78[生物学—植物学]