摘要
生物方法作为一种新兴的赤潮防治方法,因为其作用的专一性及较少的负效应,越来越受到人们的重视。研究了龙须菜(G racilaria lem aneif orm is)与东海原甲藻(P rorocentrum d ongha iense)之间营养盐NO3-、PO43-竞争的情况。结果显示,两者共培养时,龙须菜对营养盐的快速吸收利用,使得共培养体系中营养盐迅速降低,最终导致东海原甲藻消亡,而东海原甲藻对于龙须菜的生长不构成明显的影响。在营养盐充分的条件下,1g鲜重的龙须菜对NO3-的吸收能力相当于6.0×107个东海原甲藻细胞,对PO43-的吸收相当于2.4×107个东海原甲藻细胞。相对于东海原甲藻,龙须菜对营养盐的吸收利用更具有优势。龙须菜可作为有效吸收营养盐的大型海藻,用以降低近海水域富营养化程度及有害赤潮发生的几率。
The harmful algal blooms （HABs） are occurring in more locations than ever before and have caused serious destruction to the coastal marine environment and massive mortality of cultured organisms. Various mitigating methods,such as physical or chemical ones, have been proposed, but the results are not desirable because of their unpredictable impacts on marine ecosystem. Biological strategies are thus suggested for its potential HABs mitigating ability with little side effects. Macroalga is popular in aquatic ecosystem and could affect microalgal growth efficiently. To further identify the possibility utilizing macroalga in HABs mitigating, a popular species of macroalga Gracilaria lemaneiformis, which distribute widely in coastal China, was used to estimate its interference with a causative bloom dinoflagellate Prorocentrum donghaiense under controlled laboratory conditions from view of nutrient competition. Results showed that G. lemameiformis had obviously algicidal effects on P. donghaiense in the coexisting system and the cells of P. donghaiense could be entirely extinguished at the end of experiments. Oppositely, P. donghaiense had little effects on growth of G. lemoneiformis and its daily increasing rate was about 5.8 %, which presented no significant difference with that in mono cultivating system. The simultaneous nutrition assays in coexisting systems showed G. lemoneiformis absorbed nitrate and phosphate more efficiently and played dominant role in nutrition competition compared with P. donghaiense in the coexisting system. The phosphate and nitrate in the coexisting system were almost exhausted when the cell density of P. donghaiense began to decrease and there was a close relationship between cell density decreasing and nutrition consumption. When nutrients were sufficient, the nutrition absorbing ability of 1 g （FW） G. lemaneiformis was equivalent to that of 6.0×10^7 cells of P. donghaiense in nitrate assimilation and about 2.4 ×10^7 cells in phosphate. Results inferred that the dominant ro
出处
《生态学报》
CAS
CSCD
北大核心
2005年第10期2676-2680,共5页
Acta Ecologica Sinica
基金
国家重点基础研究发展规划资助项目(2001CB409710)
国家杰出青年科学基金资助项目(400025614)
国家自然科学基金重点资助项目(50339040)~~
关键词
龙须菜
东海原甲藻
富营养化
营养竞争
Gracilaria lemanei formis
Prorocentrum donghaiense
eutrophication
competition about nutrients
