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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Response of a natural phytoplankton community from the Qingdao coast (Yellow Sea, China) to variable CO2 revels over a short-term incubation experiment
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Response of a natural phytoplankton community from the Qingdao coast (Yellow Sea, China) to variable CO2 revels over a short-term incubation experiment

机译：青岛市沿海（中国黄海）天然浮游植物群落对CO 2释放量的短期孵化反应的响应

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摘要

Since marine phytoplankton play a vital role in stabilizing earth's climate by removing significant amount of atmospheric CO2, their responses to increasing CO2 levels are indeed vital to address. The responses of a natural phytoplankton community from the Qingdao coast (NW Yellow Sea, China) was studied under different CO2 levels in microcosms. HPLC pigment analysis revealed the presence of diatoms as a dominant microalgal group; however, members of chlorophytes, prasinophytes, cryptophytes and cyanophytes were also present. delta C-13(POM) values indicated that the phytoplankton community probably utilized bicarbonate ions as dissolved inorganic carbon source through a carbon concentration mechanism (CCM) under low CO2 levels, and diffusive CO2 uptake increased upon the increase of external CO2 levels. Although, considerable increase in phytoplankton biomass was noticed in all CO2 treatments, CO2-induced effects were absent. Higher net nitrogen uptake under low CO2 levels could be related to the synthesis of CCM components. Flow cytometry analysis showed slight reduction in the abundance of Synechococcus and pico-eukaryotes under the high CO2 treatments. Diatoms did not show any negative impact in response to increasing CO2 levels; however, chlorophytes revealed a reverse tend. Heterotrophic bacterial count enhanced with increasing CO2 levels and indicated higher abundance of labile organic carbon. Thus, the present study indicates that any change in dissolved CO2 concentrations in this area may affect phytoplankton physiology and community structure and needs further long-term study.
机译：由于海洋浮游植物通过去除大量大气中的CO2在稳定地球气候中起着至关重要的作用，因此应对这些问题对于解决CO2浓度升高的问题确实至关重要。在微观环境中研究了不同CO2水平下来自青岛海岸（中国西北黄海）的天然浮游植物群落的响应。 HPLC色素分析表明，硅藻作为主要的微藻类群存在。然而，也存在叶绿素，类植物，隐生植物和蓝藻的成员。 δC-13（POM）值表明，在低CO2浓度下，浮游植物群落可能通过碳浓缩机制（CCM）利用碳酸氢根离子作为溶解的无机碳源，并且随着外部CO2浓度的增加，扩散性CO2吸收量增加。尽管在所有CO2处理中都发现了浮游植物生物量的显着增加，但没有CO2诱导的影响。在低CO2水平下较高的净氮吸收量可能与CCM组分的合成有关。流式细胞仪分析显示，在高CO2处理下，球菌和皮真核生物的丰度略有降低。硅藻对增加的二氧化碳水平没有显示出任何负面影响。然而，叶绿素显示出相反的趋势。异养细菌计数随CO2水平增加而增加，并表明不稳定有机碳的含量更高。因此，本研究表明该地区溶解的CO2浓度的任何变化都可能影响浮游植物的生理和群落结构，需要进一步的长期研究。

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