不同N、P营养水平对孔石莼克制赤潮异弯藻效果的影响  

Influence of Different N,P Nutrient Levels on the Effectiveness of Allelopathic Effect of Ulva pertusa on Heterosigma akashiwo

作　　者：金秋[1] 金则新[1,2] 奚立民[1] 

机构地区：[1]台州职业技术学院生物与化学工程系,浙江台州318000 [2]台州学院,浙江临海317000

出　　处：《科技通报》2012年第3期32-37,共6页Bulletin of Science and Technology

基　　金：国家自然科学基金项目(39870160);浙江省自然科学基金资助项目(Y504220)

摘　　要：研究了4个不同营养水平的(N、P营养充足、N限制、P限制和N、P双限制)大型海藻孔石莼(Ulva pertusa)对同样4个不同营养水平的海洋赤潮微藻赤潮异弯藻(Heterosigma akashiwo)的克制效果。不同的N、P营养状况能够显著影响孔石莼克制赤潮异弯藻的效果,N限制或P限制和N、P双限制下的孔石莼对赤潮异弯藻的克制作用减弱,N限制的赤潮异弯藻对孔石莼克生物质的耐受性增强,而P限制和N、P双限制的赤潮异弯藻对孔石莼的克生物质更加敏感。研究结果表明,不同营养状况下大型海藻对海洋微藻不同程度的克生作用可能是自然海洋生态系统中,N、P营养盐动态变化引起大型海藻和微藻种群动态变化的原因之一。Allelopathic effectiveness of Ulva pertusa of four different nutrient levels （N,P sufficient; N limitation; P limitation and N ,P double limitation） on Heterosigma akashiwo of the same four different nutrient levels was investigated. Different N ,P nutrient levels had significant influence on the effectiveness of allelopathic effect of Ulva pertusa on Heterosigma akashiwo. The allelopathic effectiveness was decreased when Ulva pertusa was under N or P limitation or N, P double limitation. Cells of Heterosigma akashiwo under N limitation were more tolerant to the macroalga, while mi- croalgal cells under P limitation or N, P double limitation were more sensitive to the macroalga. Different allelopathic effectiveness of maeroalgae on microalgae under different nutrient levels may be one of the mechanisms that caused different population dynamics of macroalgae and microalgae during the change of N, P nutrient in coastal areas.

关 键 词：孔石莼 赤潮异弯藻 营养水平 克生作用 

分 类 号：Q178.1[生物学—水生生物学]