Photosynthetic features and primary productivity of phytoplankton in the Oyashio and Kuroshio–Oyashio transition regions of the northwest Pacific
Photosynthetic features and primary productivity of phytoplankton in the Oyashio and Kuroshio–Oyashio transition regions of the northwest Pacific
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DOI：
10.1093/plankt/fbp050
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发表时间：
2009-09
影响因子：
2.1
通讯作者：
Tomonori Isada;A. Kuwata;H. Saito;T. Ono;M. Ishii;H. Yoshikawa‐Inoue;Koji Suzuki
中科院分区：
文献类型：
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作者：
Tomonori Isada;A. Kuwata;H. Saito;T. Ono;M. Ishii;H. Yoshikawa‐Inoue;Koji Suzuki
2005年调查了西北太平洋Oyashio(Oy)和黑潮-Oyashio过渡区浮游植物光合作用生理和初级生产力的昼夜和季节变化，以及群落组成。在这两个地区，由于光生理的差异，光合作用-辐照度(P-E)曲线中的最大光合作用速率(P*max)和光饱和指数(Ek)都出现了昼夜变化。在Oy区，叶绿素a浓度、深度综合初级生产力和光合作用固碳最大量子效率(Fcmax)的最高值出现在硅藻水华发生的5月份。此外，在5月和9月，Oy区浮游植物光合作用的水柱光利用效率(C)都较高。相比之下，在TR区和暖核环区，FC max几乎保持不变，而5月份经深度整合的初级生产量明显低于Oy区。这些结果表明，OY水域春季浮游植物群落在光合作用过程中具有较高的光能利用能力。如此高的光合作用特性将有助于世界海洋中表层二氧化碳的季节性生物降幅最高(Takahashi，T.，Sutherland，S.C.，Sweeney，C.等人)。(2002)全球海-气二氧化碳通量，基于气候表层海洋二氧化碳，以及季节性生物和温度效应。深海研究II，49,1601-1622)。
Diel and seasonal changes in the photosynthetic physiology of phytoplankton and primary productivity were investigated during 2005, together with community composition in the Oyashio (OY) and Kuroshio – Oyashio transition (TR) regions of the northwest Pacific. In both regions, diel changes in the maximum photosynthetic rate (P* max) and the light saturation index (Ek) in the photosynthesis – irradiance (P –E) curve were observed, due to diel differences in photo-physiology. In the OY region, the highest values of chlorophyll a concentration, depth-integrated primary production and the maximum quantum yield of carbon fixation in photosynthesis (Fc max) were observed in May when diatom blooms occurred. Furthermore, a higher water-column light utilization efficiency (C) of photosynthesis for phytoplankton was found in the OY region in both May and September. In contrast, in the TR and warm-core ring regions, Fc max was nearly constant, while depth-integrated primary production in May was significantly lower than in the OY region. These results show that the spring phytoplankton assemblages in OY waters had a higher light utilization ability during photosynthesis. Such a high photosynthetic property would contribute to the highest seasonal biological drawdown of surface pCO2 among the world’s oceans (Takahashi, T., Sutherland, S. C., Sweeney, C. et al. (2002) Global sea – air CO2 flux based on climatological surface ocean pCO2, and seasonal biological and temperature effects. Deep-Sea Res. II, 49, 1601– 1622).