Seasonal variability in phytoplankton carbon biomass and primary production, and their contribution to particulate carbon in the neritic area of Sagami Bay, Japan
Seasonal variability in phytoplankton carbon biomass and primary production, and their contribution to particulate carbon in the neritic area of Sagami Bay, Japan
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DOI：
10.3800/pbr.14.224
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发表时间：
2019-11
影响因子：
0.6
通讯作者：
K. Ara;Satoshi Fukuyama;Takeshi Okutsu;S. Nagasaka;A. Shiomoto
中科院分区：
文献类型：
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作者：
K. Ara;Satoshi Fukuyama;Takeshi Okutsu;S. Nagasaka;A. Shiomoto
2008年1月至2013年12月，在神奈川相模湾的一个浅海站，对环境变量叶绿素a（Chl-a）、颗粒碳和氮（分别为PC和PN）、浮游植物碳生物量（Ph-C）和初级生产力的季节变化进行了调查。通过显微镜观察从细胞体积转换大小分级的Ph-C，为该领域增加了有价值的数据。在春季水华期间，微尺度部分（>20 μm）占总叶绿素a和总Ph-C的大部分，而在其他时期，皮和纳米尺度部分（15.7 MJ m−2 d−1），高营养浓度和平衡的摩尔比。根据各粒级Ph-C-Chl-a关系的回归方程，20 μm粒级和总粒级的Ph-C/Chl-a比值分别为5.3-7.7、29.2-32.6和22.1-25.1。Ph-C/Chl-a比值（1.8-128.8）受光照和营养盐的调节。增长率（CA）0-3.7 d−1）与光照和同化数呈正相关，与Ph-C/Chl-a呈负相关。深度综合初级生产力（DIPP）为0.15-5.43 g C m−2 d−1。在0-50 m深度积分值的基础上，总Ph-C和DIPP分别占PC的1.3-34.4%和1.3-30.9% d−1，表明PC的变化取决于总Ph-C和DIPP。
Seasonal variations in environmental variables, chlorophyll a (Chl-a), particulate carbon and nitrogen (PC and PN, respectively), phytoplankton carbon biomass (Ph-C) and primary production were investigated at a neritic station in Sagami Bay, Kanagawa, from January 2008 to December 2013. Size-fractionated Ph-C was converted from cell volume by microscopic observation, adding valuable data for this area. During spring blooms, the micro-size fraction (>20 μm) comprised the majority of the total Chl-a and total Ph-C, whereas during other periods the picoand nanosize fraction (15.7 MJ m−2 d−1), high nutrient concentrations and balanced molar ratios. From the regression equations of size-fractionated Ph-C-Chl-a relationships, the mean Ph-C/Chl-a ratio was 5.3–7.7, 29.2–32.6 and 22.1–25.1 for the 20 μm and total fraction, respectively. The Ph-C/Chl-a ratio (1.8–128.8) was regulated by irradiance and nutrients. Growth rate (ca. 0–3.7 d−1) was positively correlated with irradiance and assimilation number, and negatively with the Ph-C/Chl-a ratio. The depth-integrated primary production (DIPP) was 0.15–5.43 g C m−2 d−1. On the basis of the 0–50 m depth-integrated values, the total Ph-C and DIPP accounted for 1.3–34.4% and 1.3–30.9% d−1 of PC, respectively, indicating that PC variations depended on the total Ph-C and DIPP.