东海束毛藻的时空分布及其固氮、固碳作用研究

项目名称： 东海束毛藻的时空分布及其固氮、固碳作用研究

项目编号： No.41206103

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 海洋科学

项目作者： 江志兵

作者单位： 国家海洋局第二海洋研究所

项目金额： 26万元

中文摘要： 束毛藻广泛分布于热带和亚热带的寡营养海域，因其较强的固氮和固碳能力，近来备受关注。东海区的束毛藻由黑潮和台湾暖流携带而来，且大量繁殖时易形成赤潮，但对其在东海的分布特征、固氮和固碳作用知之甚少。本项目拟通过2009年6月与8月、2011年四季和2013年夏季共7个航次的东海束毛藻生态现状调查，探明其在东海的种类组成、种群结构和分布特征。并结合同步理化参数和气象要素，确定束毛藻分布的主要影响因子，理清其分布与水团消长和环流变化的关系。同时，参考历史资料，研究长江口及其邻近海域夏季束毛藻的长期演变规律和主要受控因子。此外，利用其水柱积分丰度值与藻丝的固氮、固碳速率及碳、氮和叶绿素a含量，估算东海束毛藻的固氮、固碳量及其对浮游植物现存量、初级生产和新生产的贡献。项目成果可更深入了解的束毛藻在东海碳、氮生物地球化学循环中的作用，并可为揭示东海束毛藻爆发赤潮的驱动机制提供依据。

中文关键词： 束毛藻；东海；分布格局；固氮；受控因子

英文摘要： Trichodesmium spp. is widely distributed in the oligotrophic tropical and subtropical waters. Due to its strong ability for nitrogen fixation and carbon assimilation, Trichodesmium spp. has been recently paid more attention by many oceanographers. The Kuroshio and Taiwan Warm Current bring the East China Sea (ECS) abundant Trichodesmium spp. which frequently causes red tide. However, little is know about its distribution pattern, nitrogen and carbon fixation. Seven cruises are planned to carried out for a wide investigation of Trichodesmium spp. ecological situation in the year of 2009 (June and Augest), 2011 (four seasons), and 2013 (summer). in the continental shelf and Kuroshio of ECS. The objectives of present project are to (1) find out its species composition, community structure, and spatial-temporal change in horizontal and vertical distribution; (2) identify the main influence factors to its distribution combined with physical, chemical, and meteorologic parameters, and explore the relationship between the abundance distribution and the change of water mass and circulation; (3) uncover its long-time development and controlled factors in the Changjiang Estuary and its adjacent waters during summer, according to the historical data; (4) estimate its nitrogen and carbon fixation in the ECS through the dept

英文关键词： Trichodesmium spp.；East China Sea；Distribution pattern；Nitrogen fixation；Controlling factors