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

控制沿海透光区生物泵效率的因素——从生物、元素和有机分子分析——

基本信息

批准号：
11440226
负责人：
HAMA Takeo
金额：
$ 9.79万
依托单位：
UNIVERSITY OF TSUKUBA
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440226/
关键词：
BIOLOGICAL PUMP PRIMARY PRODUCTION EXPORT PRODUCTION PHYTOPLANKTON VERTICAL TRANSPORT CARBOHYDRATES

项目摘要

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.

通过对日本相模湾和下田近海的野外观测，研究了初级生产力和光合产物组成的季节变化。初级生产力在10月和4月在相模湾中心出现最大值。这表明，初级生产力主要依赖于水体垂直混合所提供的营养物质。2）光合产物中碳水化合物的贡献在夏季有增加的趋势。夏季上层营养盐的消耗可能是碳水化合物贡献增加的结果。3）根据下田海域有机质的生产率和沉降率计算的输出率显示出异常高的值，约为1。沉积物有机质的侧向迁移和再悬浮可能是导致高输出率的主要原因。4）碳水化合物的输出率最高，大于1，脂肪酸的输出率最低，在0.3左右。这一结果清楚地表明，碳水化合物参与了沉降颗粒的形成，并在有机物质的垂直输运中起着重要作用。