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典型赤潮藻对磷的生态生理响应【作者】欧林坚 【导师】黄邦钦

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典型赤潮藻对磷的生态生理响应
X(O:_:H5HS,sX+qO0Ecophysiological Responses of Typical Harmful Algal Bloom Species to Phosphorus

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(?OH,U;SOO9@0作者欧林坚导师黄邦钦水利论文 M ~D!QqRf.r [4QD
【作者基本信息】厦门大学,环境科学,2006年,博士水利论文i~;S4K w

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【中文摘要】 采用现场调查、现场船基围隔和室内培养实验等手段,研究中国近海若干海区浮游植物的磷营养限制与胁迫状况,选取几种典型赤潮藻东海原甲藻(Prorocentrum donghaiense)、链状亚历山大藻(Alexandrium catenella)、中肋骨条藻(Skeletonema costatum),研究该赤潮藻对营养盐(主要为磷)的生态生理响应,探讨赤潮藻的磷竞争策略,分析赤潮藻在磷营养代谢上的竞争优势及其机制。主要实验结果如下:1.现场碱性磷酸酶(Alkaline phosphatase, AP)结果表明,东海长江口邻近海域赤潮高发区、台湾海峡的南部海区、厦门港等研究海域都存在不同程度的磷胁迫。其中,又以长江口邻近海域赤潮高发区的磷胁迫状态最为严重。结合现场营养盐、碱性磷酸酶活性(Alkaline phosphatase activity, APA)及营养盐加富围隔实验数据,表明,春季长江口赤潮高发区内浮游植物的生长受到磷营养盐的限制。台湾海峡南部近岸上升流区,水华发生导致浮游植物的磷胁迫加剧。2002年、2003年和2005年春季(4 5月),长江口邻近海域赤潮高发区内,浮游生...更多物群落存在磷胁迫状况(2005年春季长江口外近岸水域除外),这一胁迫程度在2003年春季东海原甲藻赤潮爆发期间有所加剧。APA粒径结果表明,浮游植物是AP主要的提供者。2005年春季,高比例的酶标记荧光(ELF%)表明优势种甲藻受到显著磷胁迫,是该海区AP的主要贡献者,硅藻和金藻几乎不存在磷胁迫。2004年夏季(7 8月),台湾海峡南部海区,浮游植物群落受到磷胁迫。在近岸上升流区内,水华发生导致浮游植物的磷胁迫程度加深。高比例ELF%表明甲藻受到严峻的磷胁迫,此外优势种硅藻,如冰河拟星杆藻(Asterionellopsis glacialis )、菱形海线藻( Thalassionema nitzschioides )和尖刺拟菱形藻(Pseudo-nitzschia pungens)的磷胁迫程度也较为严峻。2005年冬季(3月),海区浮游植物的磷胁迫程度有所缓解。2.海区AP调控机制非常复杂,受多因子(包括温度、盐度、pH、溶解氧、营养盐的浓度与比例、浮游植物群落结构及其丰度)共同作用,且不同因子的作用效力不是一定的,随海区实际情况有所改变。多数情况下,营养盐是调控  还原

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【英文摘要】 The study on ecophysiological responses of typical HAB species to nutrients (in particular phosphorus) were carried out using field survey, ship-based mesocosm experiments and lab-based incubation experiments in the high frequency HAB areas in the Yangtze River estuary and its adjacent East China Sea, southern Taiwan Strait and Xiamen Harbour. The phosphorus status of natural phytoplankton and the effects of nutrients on phytoplankton community structure were evaluated. The strategies of typical HAB species to the variations of environmental phosphorus were emphasized on, and whether the typical HAB species advantaged in competing for phosphorus and its mechanisms were discussed. The main results were as follows:1. Alkaline phosphatase activity (APA) showed that phytoplankton in the study areas suffered phosphorus (P) stresses with different degrees, with significance during bloom occurrence in sea areas in the Yangtze River estuary. All results from nutrients, APA and mesocosm enrichm...更多ent experiments on board indicated that phytoplankton was P limited in the high frequency HAB areas in the Yangtze River estuary during spring. In the bloom period at the coastal upwelling zone in southern Taiwan Strait during summer, phytoplankton’s P-stress status strengthened. During the spring (April May) of 2002, 2003 and 2005, phytoplankton communities were under P stress in the Yangtze River estuary and its adjacent East China Sea (except the area just outside the Yangtze River estuary during the spring of 2005). P stress degrees strengthened during the bloom period in 2003. Size - fractionated APA indicated that phytoplankton was the main contributor of total APA. During the spring of 2005, high percentages of ELF labeling of the dominant dinoflagellates suggested that they suffered severe P stress and were the main contributors of AP while very low percentages of ELF labeling were found among Chrysophyta and diatom, indicating that they were not P stressed or slightly P stressed.During the summer (July August) of 2004, phytoplankton community suffered P stress in southern Taiwan Strait, in particular during the bloom period in the coastal upwelling zone. High percentages of ELF labeling of dinoflagellates showed that they were under severe P-stress status. Besides, the dominant species diatom, such as  还原水利论文:_ { A7t.d yr

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【中文关键词】 典型赤潮藻; 磷; 溶解态非活性磷; 生态生理策略; 碱性磷酸酶水利论文[1BC,s$a [1p
【英文关键词】 typical HAB species; phosphorus; soluble nonreactive phosphorus; ecophysiological strategies; alkaline phosphatase水利论文|oT2FVc8^z

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TAG: 赤潮 导师 黄邦钦 欧林坚 生理
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