| 摘要: |
| 本文根据2013 年东海海域(120°—128°E、25°—33°N)春、夏、秋、冬的4 个航次调查资料,分析了营养盐结构的时空分布并探讨其对浮游植物生长限制的情况。结果表明: (1) 东海DIN(无机氮)/P(磷)、Si(硅)/DIN 及Si/P 比值受各种水团及浮游植物生长周期的影响较为明显, 长江冲淡水与沿岸水的交汇作用控制着全航次DIN/P 比值, 基本呈近岸高、远海低的分布规律, 而Si/DIN 比值的分布则相反。春、夏季Si/P 高值区主要分布在近岸, 而秋、冬季则开始由中部海域向远海扩展。(2)研究海域浮游植物的生长主要受到N 和P 的限制, 126°E 以西的近岸及中部海域以P 限制为主, 而126°E 以东的黑潮区受N 限制; 在季节变化上又以夏季受到营养盐的限制最明显。(3) 与2001—2010年同期历史资料相比, 2013 年夏季航次受P 限制站位数量比过往10 年有所增加, 限制范围由28°—32°N、123°E 以西的长江口及浙北沿岸海域扩展到了126°E 以西的东海中部及近岸水域; 受N限制站位基本集中在126°—127°E 以东黑潮区海域, 但空间范围比十年前增大。 |
| 关键词: 东海 营养盐结构 时空分布 限制 历史资料 |
| DOI：10.11693/hyhz20140400122 |
| 分类号: |
| 基金项目:国家海洋局公益专项项目,200905012-2号;国家海洋局赤潮重点实验室开放研究基金项目,MATHHAB20120308号。 |
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| TEMPORAL AND SPATIAL DISTRIBUTIONS OF NUTRIENT STRUCTURE AND LIMITATION ON PHYTOPLANKTON IN THE EAST CHINA SEA |
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YE Ran, LIU Yan-Yun, CUI Yong-Ping, WANG Ze-Shou, YE Xian-Sen
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Marine Environmental Monitoring Centre of Ningbo, SOA, Ningbo 315012, China
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| Abstract: |
| We studied the nutrient structure and their limitation upon phytoplankton in temporal and spatial distributions based on four seasonal cruises in 2013 over the East China Sea. Findings are followed. (1) The ratio of DIN:P, Si:DIN, Si:P were significantly affected by the growth cycle of phytoplankton in various water masses, of which the convergence of Changjiang (Yangtze River) Diluted Water and coastal current controlled the ratio of DIN:P in all seasons, featuring higher values in the offshore waters and lower in the open sea, while Si:DIN ratio was the opposite. The majority area of high Si:P ratio located in the offshore waters in spring and summer and extended from the central part eastward in autumn and winter. (2) The growth of phytoplankton was mainly limited by nitrogen and phosphate in the area and phosphate limitation in the central part and offshore waters mainly. In the area west of 126°E was in mainly phosphate limitation controlled by the Kuroshio, while in the area east of the line was in nitrogen limitation especially in the summer. (3) Phosphate limitation increased in summer in area from 2001 to 2010 and covered the majority area of the central part and offshore waters; the area of phosphate limitation expended from 28°—32°N and west of 123°E in Changjiang River estuary and northern Zhejiang coastal region a decade ago, to the area of 126°E in 2013 reaching the central part of the East China Sea. However, the area of nitrogen limitation was confined largely east of 126°E in the Kuroshio realm, but the area increased in recent decade. |
| Key words: East China Sea nutrient structure limitation temporal and spatial distribution past records |
