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作 者 ：乐凤凤,宁修仁*,刘诚刚,郝锵,蔡昱明

期 刊 ：生态学报 2008年 28卷 11期 页码：5775~5784

关键词：冬季；南海北部；浮游植物；现存量和初级生产力；

Keywords:winter, northern South China Sea, phytoplankton, standing stock and primary production,

摘 要 ：通过2006年2月在南海北部现场调查所获得的数据分析研究了海域的浮游植物现存量和生产力，结果表明冬季浮游植物的分布特征与东北季风引起的环流场的变化关系密切。调查海域水柱平均Chl a浓度的变化范围为0.03~1.21 mg·m-3（平均(0.33±0.33) mg·m-3），高值区出现在广东沿岸及海南岛东部附近海域；初级生产力的分布范围为41.3 ~1040.0 mgC·m-2·d-1。由于东北季风引起近岸水体混合剧烈，不利于浮游植物生长，因此虽然沿岸带Chl a浓度（(0.53±0.50) mg·m-3）较高，但初级生产力却是最低的，只有41.3 mgC·m-2·d-1，同时冬季反气旋涡强度下降和底层富营养水的涌升，营养盐充足，因此开阔海的Chl a浓度((0.31±0.30) mg·m-3）和初级生产力((631.3±578.0) mgC·m-2·d-1)均高。浮游植物粒度级份测定表明，Pico级份对冬季南海北部浮游植物现存量和生产力的贡献很大，特别是在开阔海区，分别占47%和66%。

Abstract:Standing stock and production of phytoplankton in the northern South China Sea (nSCS) were studied during February 2006 when northeast monsoon strongly prevailed. The results clearly showed that the distributions of phytoplankton were closely related to the physical-chemical-biological coupled processes driven by the northeast monsoon. The chlorophyll-a (Chl a) concentration varied from 0.03 mg·m-3 to 1.21 mg·m-3 (the average value was (0.33±0.33) mg·m-3). The most of high values appeared in the coast areas near Guangdong Province and in the sea area to the east of Hainan Island. The lowest and highest value of primary production (PP) were 41.3 mgC·m-2·d-1 and 1040.0 mgC·m-2·d-1. The distribution patterns of Chl a differed from PP in three different regions. As for Chl a, coastal region ((0.53±0.50) mg·m-3) had much higher value than open sea ((0.31±0.30) mg m-3) and shelf region ((0.20±0.11) mg·m-3); as for PP, the variation showed opposite: open sea had the highest value ((631.3±578.0) mgC·m-2·d-1), followed by shelf (1622 mgC·m-2·d-1) and coastal region (41.3 mgC·m-2·d-1) in turn. Photosynthetic picoplankton was found to be the greatest contributor to phytoplankton stocks and production in all study area, especially in open sea, 47% and 66% respectively.

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