Seasonal and vertical variations in phytoplankton photosynthetic parameters and primary production in Suruga Bay, Japan
Seasonal and vertical variations in phytoplankton photosynthetic parameters and primary production in Suruga Bay, Japan
复制标题
日本骏河湾浮游植物光合参数和初级生产力的季节和垂直变化
DOI：
10.1007/s10872-021-00610-9
复制
发表时间：
2021
影响因子：
2.3
通讯作者：
Hayashizaki Kenichi
中科院分区：
文献类型：
--
作者：
Yoshikawa Takashi;Sohrin Rumi;Obayashi Yumiko;Matsuura Hiroyuki;Nishikawa Jun;Hayashizaki Kenichi
研究了骏河湾近海光合-辐射（P-E）参数和初级生产力的季节和垂直变化。骏河湾受亚热带暖黑潮和富营养化近岸海水的影响。最大光能利用系数α* 在暖期和冷期的表层和次表层之间没有表现出显著的变化。最大光合速率和光饱和参数Ek的垂直差异即使在温暖时期也很小。P-E参数的季节变化与表层溶解性无机氮（DIN）无显著相关。这些结果表明，低营养盐和强光胁迫并不严重，即使在分层季节，由于高营养河水的持续流入，在表层。相关性分析表明，浮游植物的光适应性（Ek依赖型）和营养盐和生长条件的响应性（Ek非依赖型）共同调控着α和α* 的季节变化。次表层叶绿素最大值（SCM）的形成不太明显，主要的初级生产发生在真光层的上半部分。由于忽略了P-E参数和叶绿素的垂直变化，特别是在暖期，水柱初级生产力（总）往往被高估。初级生产力的这些功能似乎是类似于那些在沿海沃茨，而不是在亚热带沃茨，在海湾渔场的形成发挥了重要作用。
Seasonal and vertical variations in photosynthetic–irradiance (P–E) parameters and primary production were examined in offshore Suruga Bay, where both the subtropical warm Kuroshio Water and eutrophic coastal water were influential. The maximum light-utilization coefficient,α*, did not show significant variation between the surface and subsurface layers in both the warm and cold periods. Vertical differences in the maximum photosynthetic rate,, and the light-saturation parameter,Ek, were small even during the warm period. Seasonal variations in theP–Eparameters were not significantly related to dissolved inorganic nitrogen (DIN) at the surface layer. These results suggest that low-nutrient and high-light stresses were not serious at the surface layer, even in the stratified season, because of the continuous inflow of high-nutrient river water. Seasonal variations inandα*were suggested to be regulated by both theEk-dependent (photo-acclimation of phytoplankton) andEk-independent (response to nutrient and growth conditions) mechanisms from the correlation analyses. The subsurface chlorophyll maximum (SCM) formation was less obvious, and a major part of the primary production occurred in the upper half of the euphotic zone. The water-column primary production, ΣPP (total), tended to be overestimated by ignoring vertical variations in theP–Eparameters and chlorophylla, especially during the warm period. These features of primary production appeared to be similar to those reported in coastal waters rather than in subtropical waters, playing an essential role in the fishing ground formation in the bay.