FACTORS CONTRORING THE EFFICIENCY OF THE BIOLOGICAL PUMP IN THE COASTAL EUPHOTIC ZONE-ANALYSIS FROM BIOLOGICAL, ELEMENTAL AND ORGANIC MOLECULES-

在日本相模湾和下田海域进行了野外观测，以评估初级生产力和光合作用产物组成的季节变化。研究了初级生产过程与有机物垂直输送过程的关系。1)相模湾中心的初级生产力在10月和4月出现最大值。这有力地表明，初级生产力主要依赖于水分质量垂直混合所提供的养分。2)夏季，碳水化合物在光合作用产物中的贡献有增加的趋势。夏季上层营养物质的枯竭可能是由于碳水化合物的贡献增加所致。3)根据下田海域测量的有机质的产生率和沉降率计算的输出比在1附近表现出异常高的值，沉积物有机质的横向输送和再悬浮可能是输出比高的主要原因。4)碳水化合物的高输出比大于1，而脂肪酸的输出比在0.3左右低。这一结果清楚地表明，碳水化合物与下沉颗粒的形成有关，并在有机物质的垂直运输中发挥着重要作用。

The field observation in Sagami Bay and off Shimoda, Japan has been carried out to assess the seasonal changes in the primary productivity and the composition of photosynthetic products. The relation between the primary production process and the vertical transport process of organic matter has been also studied.1) The primary productivity at the center of the Sagami Bay showed maxim in October and April. This strongly suggests that the primary productivity primary depended on the supply of the nutrients due to the vertical mixing of water mass.2) The contribution of carbohydrates in the photosynthetic products tended to increase in summer period. Nutrient depletion in upper layer in summer is likely resulted in the increase in the contribution of carbohydrates.3) The export ratio, which is calculated from the production rate and the sinking rate of organic matter measured off Shimoda, exhibited unusual high values around 1. The lateral transport and resuspension of sediment organic matter are probably main reasons of the high export ratio.4) Carbohydrates showed the high export ratio more than 1, fatty acids, on the other hand, exhibited the low export ratio around 0.3. This results clearly shows that carbohydrates concerns the formation of the sinking particles and play an important roles in the vertical transport of organic materials.