Microbial respiration in the euphotic zone at Station ALOHA
Microbial respiration in the euphotic zone at Station ALOHA
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DOI：
10.1002/lno.10072
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发表时间：
2015-05
影响因子：
4.5
通讯作者：
S. Martínez-García;D. Karl
中科院分区：
文献类型：
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作者：
S. Martínez-García;D. Karl
采用活体INT方法对ALOHA站真光层（0-200 m）微生物群落呼吸（MCR）的时空和垂直变化进行了测量，以限制该海洋站点的氧和碳循环。真光层上部（0-100 m）的平均（± 1 SE）MCR（0.89 ± 0.05 mmol O2 m−3 d−1）高于下部（100-200 m）的MCR（0.52 ± 0.05 mmol O2 m−3 d−1）。0.8 μ m粒级的呼吸相对于0.2-0.8 μm粒级的呼吸平均为1.4 ± 0.1。在MCR的变化，每天和每月的时间尺度上观察到，这表明呼吸是一个动态的过程，全年在站ALOHA。0.2-0.8 μm粒级中的MCR比> 0.8 μm MCR更易变。尽管MCR存在显著的垂直和时间变化，但真光层深度积分（0-200 m）MCR在整个观测期间相对恒定（134.8 ± 11.8 mmol O2 m−2 d−1）。通过MCR消耗的氧气总是超过从14 C-初级生产估计推断的O2生产，假设光合作用商为1.13 mol O2产生：mol CO2固定。ALOHA站2011年11月至2012年10月期间的MCR加上真光层的颗粒碳输出可用于设定总初级生产量的下限为1.45 mol C m−2 yr−1。
Measurements of the temporal and vertical variability of microbial community respiration (MCR) in the euphotic zone (0–200 m) at Station ALOHA were made using the in vivo INT method to constrain oxygen and carbon cycling at this oceanic site. Mean ( ± 1 SE) MCR was higher in the upper (0–100 m) (0.89 ± 0.05 mmol O2 m−3 d−1) than in the lower (100–200 m) portion of the euphotic zone (0.52 ± 0.05 mmol O2 m−3 d−1). Respiration in the 0.8 μm size‐fraction relative to respiration in the 0.2–0.8 μm size‐fraction was on average 1.4 ± 0.1. Variability in MCR was observed on both daily and monthly time scales, suggesting that respiration is a dynamic process throughout the year at Station ALOHA. MCR in the 0.2–0.8 μm size fraction was more variable than > 0.8 μm MCR. Despite significant vertical and temporal variability in MCR, the euphotic zone depth‐integrated (0–200 m) MCR was relatively constant (134.8 ± 11.8 mmol O2 m−2 d−1) throughout the period of observation. Oxygen consumption via MCR always exceeded O2 production extrapolated from 14C‐primary production estimation, assuming a photosynthetic quotient of 1.13 mol O2 produced : mol CO2 fixed. MCR plus particulate carbon export from the euphotic zone for the period November 2011–October 2012 at Station ALOHA can be used to set a lower limit of ∼ 45 mol C m−2 yr−1 for gross primary production.