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, \(P_{{\max }}^{*}\), and the light-saturation parameter, E_k, were small even during the warm period. Seasonal variations in the P–E parameters 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 in \(P_{{\max }}^{*}\) and α^* were suggested to be regulated by both the E_k-dependent (photo-acclimation of phytoplankton) and E_k-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 the P–E parameters and chlorophyll a, 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.

在骏河湾近海研究了光合辐照度 ( P-E ) 参数和初级生产的季节性和垂直变化，其中亚热带暖黑潮水和富营养化沿海水都有影响。最大光利用系数α ^*在暖期和冷期都没有表现出地表和地下层之间的显着变化。在最大光合速率垂直差异，\（P _ {{\ MAX}} ^ {*} \） ，和光饱和度参数， ê _ķ，甚至在暖和时期小。市盈率的季节性变化参数与表层的溶解无机氮 (DIN) 没有显着相关性。这些结果表明，由于高营养河水的不断流入，即使在分层季节，表层的低营养和高光胁迫也不严重。\(P_{{\max }}^{*}\)和α ^{* 的}季节性变化被认为受E _k依赖（浮游植物的光适应）和E _k调节-来自相关分析的独立（对营养和生长条件的反应）机制。次表层叶绿素最大值 (SCM) 的形成不太明显，初级生产的主要部分发生在透光区的上半部分。由于忽略了P-E参数和叶绿素a 的垂直变化，特别是在温暖时期，水体初级生产 ΣPP（总）往往被高估。初级生产的这些特征似乎与沿海水域而不是亚热带水域中报告的特征相似，在海湾渔场形成中起着至关重要的作用。