Effect of elevated CO 2 on organic matter pools and fluxes in a summer Baltic Sea plankton community
Effect of elevated CO 2 on organic matter pools and fluxes in a summer Baltic Sea plankton community
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DOI：
10.5194/bg-12-6181-2015
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发表时间：
2015-10
期刊：
影响因子：
4.9
通讯作者：
A. Paul;L. Bach;K. Schulz;Tim Boxhammer;J. Czerny;E. Achterberg;Dana Hellemann;Yves Trense;M. Nausch;M. Sswat;U. Riebesell
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文献类型：
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作者：
A. Paul;L. Bach;K. Schulz;Tim Boxhammer;J. Czerny;E. Achterberg;Dana Hellemann;Yves Trense;M. Nausch;M. Sswat;U. Riebesell
抽象的。海洋酸化预计会影响浮游生物群落结构和生物地球化学元素循环。到目前为止，浮游生物群落对二氧化碳浓度升高的反应主要是在营养刺激的水华期间进行的。在这项二氧化碳操纵研究中，我们使用大体积(~55m~3)中上层原位中附体，包围了波罗的海夏季春季后自然浮游生物组合，以调查有机质池对海洋酸化的响应。在没有调整自然有效养分浓度的情况下，6个中游系统中的碳酸盐系统被操纵以产生平均fCO2在365atm到1230atm之间的范围内。随后，在这个氮有限的生态系统中，对浮游生物群落的发展和关键的生物地球化学元素池进行了为期7周的跟踪。在研究的最后两周(阶段III)，我们观察到在最高fCO2处理(1231μatm)中，水体中持续的叶绿素a和颗粒物浓度较高(~25%)，而无机磷浓度较低，此时颗粒物和溶解物库的净变化较小。浮游植物色素分析表明，这些差异是由浮游微藻(
Abstract. Ocean acidification is expected to influence plankton community structure and biogeochemical element cycles. To date, the response of plankton communities to elevated CO2 has been studied primarily during nutrient-stimulated blooms. In this CO2 manipulation study, we used large-volume (~ 55 m3) pelagic in situ mesocosms to enclose a natural summer, post-spring-bloom plankton assemblage in the Baltic Sea to investigate the response of organic matter pools to ocean acidification. The carbonate system in the six mesocosms was manipulated to yield average fCO2 ranging between 365 and ~ 1230 μatm with no adjustment of naturally available nutrient concentrations. Plankton community development and key biogeochemical element pools were subsequently followed in this nitrogen-limited ecosystem over a period of 7 weeks. We observed higher sustained chlorophyll a and particulate matter concentrations (~ 25 % higher) and lower inorganic phosphate concentrations in the water column in the highest fCO2 treatment (1231 μatm) during the final 2 weeks of the study period (Phase III), when there was low net change in particulate and dissolved matter pools. Size-fractionated phytoplankton pigment analyses indicated that these differences were driven by picophytoplankton (