The study on the mechanisms of ecosystem in the trophic level and charcterization of organic matters in the Suruga Bay on the utilization of deep seawater

1)骏河湾深层海水分别从397m和687m深度抽取，表层水深度为24m。本研究的主要目的是从表层到深层了解骏河湾生态系统动态的控制因素，并对生物过程产生的有机质进行表征。在三年内进行了野外季节性研究和中尺度试验。在400米深度和700米深度的海水中都形成了发育良好的生态系统，包括放牧食物网成员和有机物质再矿化的足够的微生物环。在11天的孵育过程中，400m深度和700m深度的固定有机质数量分别接近60倍和100倍。两个深度的深海水的响应在时间尺度上（700m比400m快）和物种组成上是不同的。2)放射性碳测定结果表明，骏河湾400米深度的深海海水年龄为400年，1000米深度的深海海水年龄为1000年。有机质主要为氨基酸、磷脂、碳水化合物等，绝大多数（90%）有机质分子量在1000道尔顿以下。

1) Deep seawater in the Suruga Bay is pumped up from 397m-depth and 687m-depth with 24m-depth of surface layer water. The main purpose of this study is to understand the controlling factors of ecosystem dynamics at Suruga Bay from surface to deep layers and also to characterize organic matters produced by biological processes. Seasonal studies at the field and mesocosms experiments have been carried out during three years. A well-developed ecosystem in both 400m depths and 700m-depth seawater was developed, with including members of grazing food web and a sufficient microbial loop for the re-mineralization of organic mattes. The amount of fixed organic matter during 11 days of incubation was near 60 times and 100 times for 400m depths and 700m depths respectively. The response of deep-sea water from both depths is different in terms of time scale (rapid in case of 700m than that of 400m) and species composition.2) The measurement of radiocarbon showed that age of deep seawater in the Suruga bay ranges from 400 years for 400m and 1000 years for 1000m-depth. Organic matters were characterized as amino acids, phospholipids, carbohydrate, and most of organic matters of molecular weight is below 1000 daltons (90%).