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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.

在日本相模湾和下田附近进行了实地观测，以评估初级生产力和光合产物组成的季节变化。还研究了初级生产过程与有机质垂直输送过程之间的关系。1)相模湾中心区初级生产力在10月和4月呈现极大值。这有力地表明初级生产力主要依赖于水团垂直混合造成的养分供应。2)夏季光合产物中碳水化合物的贡献呈增加趋势。夏季上层养分的消耗可能导致碳水化合物贡献的增加。3）根据下田附近测量的有机质的产生率和沉降率计算得出的输出比率在1左右表现出异常高的值。沉积物有机质的侧向输送和再悬浮可能是高输出比率的主要原因。4）碳水化合物表现出超过1的高输出比率，另一方面，脂肪酸的出口比率较低，约为0.3。该结果清楚地表明碳水化合物涉及下沉颗粒的形成并在有机材料的垂直运输中发挥重要作用。