First in situ estimations of small phytoplankton carbon and nitrogen uptake rates in the Kara, Laptev, and East Siberian seas
First in situ estimations of small phytoplankton carbon and nitrogen uptake rates in the Kara, Laptev, and East Siberian seas
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DOI：
10.5194/bg-15-5503-2018
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发表时间：
2018-09-17
期刊：
影响因子：
4.9
通讯作者：
Lee, Sang Heon
中科院分区：
文献类型：
--
作者：
Bhavya, P. Sadanandan;Lee, Jang Han;Lee, Sang Heon
利用原位同位素标记实验对北冰洋卡拉海、拉普特夫海和东西伯利亚海小型浮游植物(0.7-5亩)的碳和氮吸收速率进行了量化；这项研究是一项新的研究，是NABOS(南森和阿蒙森盆地观测系统)计划的一部分，于2013年8月21日至9月22日进行。小型浮游植物对碳(C)、硝酸盐(NO3-)和铵(NH4+)的深度吸收速率分别为0.54~15.96 mg cm-2 h(-1)、0.05~1.02 mg Cm(-2)h(-1)和0.11~3.73 mg Nm(-2)h(-1)。小型浮游植物对总C、NO3-和NH(4)(+)的贡献率分别为25%~89%、31%~89%和28%~91%。本研究中发现的小型浮游植物对NO3-和NH4+的周转时间表明，营养物质在较深水域的停留时间(年)较长，尤其是NO3-。此外，本研究中从海冰浓度较低的地点获得的小型浮游植物对C和N的吸收速率相对较高，表明小型浮游植物可能在海冰因气候变暖而消退的情况下繁衍生息。小型浮游植物对总C和N吸收速率的高贡献表明小型自养生物有能力承受气候变化带来的不利水文条件。
Carbon and nitrogen uptake rates by small phytoplankton (0.7-5 mu m) in the Kara, Laptev, and East Siberian seas in the Arctic Ocean were quantified using in situ isotope labeling experiments; this research, which was novel and part of the NABOS (Nansen and Amundsen Basins Observational System) program, took place from 21 August to 22 September 2013. The depth-integrated carbon (C), nitrate (NO3-), and ammonium (NH4+) uptake rates by small phytoplankton ranged from 0.54 to 15.96 mg Cm-2 h(-1), 0.05 to 1.02 mg C m(-2) h(-1), and 0.11 to 3.73 mg N m(-2) h(-1), respectively. The contributions of small phytoplankton towards the total C, NO3-, and NH(4)(+ )varied from 25 % to 89 %, 31 % to 89 %, and 28 % to 91 %, respectively. The turnover times for NO3- and NH4+ by small phytoplankton found in the present study indicate the longer residence times (years) of the nutrients in the deeper waters, particularly for NO3-. Additionally, the relatively higher C and N uptake rates by small phytoplankton obtained in the present study from locations with less sea ice concentration indicate the possibility that small phytoplankton thrive under the retreat of sea ice as a result of warming conditions. The high contributions of small phytoplankton to the total C and N uptake rates suggest the capability of small autotrophs to withstand the adverse hydrographic conditions introduced by climate change.