Quantitative relationship on the behavior between organic matters and radionuclides in seawater

海水中有机物与放射性核素行为的定量关系

• 批准号: 13480155
• 负责人: SUZUKI Yoshimi
• 金额: $ 9.6万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13480155/
• 关键词: radionuclide; organic matter; corelationship; organic production; organic decomposition; Pb-210,P-32,Th-234; decomposition process; incubation experiment; pb210,P-23,Th-234; 分解課程; Pb-210,P-32,Th-234

Mesocosm experiment using the mesopelagic water from 400m depth of Suruga Bay was carried out from 20 November to 10 December 2002. Autotrophic biomass increased from 0.2μg C1^<-1> to 1.3mg C1^<-1> during the first 7 days of incubation. Nitrate and phosphate were depleted rapidly during Days 7 to 12 of incubation. It was thought that both nutrients-rich condition and low grazing pressure due to the low concentration of predator in the mesopelagic water at initial time caused bloom of autotrophic components. Biomass peak of bacteria, heterotrophic nanoflagellates (HNF) and ciliates occurred between Days 9 and 13 following the peak of autotrophic biomass. These results suggest that organic materials were transferred from autotrophic components to bacteria and subsequently to HNF and ciliates after nitrate was depleted, and then organic materials flowed through the microbial loop. POM (particulate organic matter) was divided in to the different size (>500μm,500〜105,105〜25,and 25〜0.4), and TH-234,Pb-210,Po-210 were measured in each fraction. Th-234 was not detected in dissolved form, while 80% of Th-234 in particulate form was found in size fraction from 0.6 to 500μm. The behavior of Th-234,Pb-210 and Po-210 was due to the behavior of POM with size of 0.4 to 25μm. The size distribution of P-32 is corresponding to the size distribution of phytoplankton, and its turnover time is about one week.

从2002年11月10日开始，使用了Suruga湾400m深度的中质水中的中质水。磷酸盐的孵化速度迅速，因为捕食者在最初的时间内捕食捕食者。自养生物量的峰值的9和13。在每个馏分中测量了-210，PO-210在TH-234中未检测到Th-234，PB-210和PO-210的行为。 μm。

项目成果

鈴木 款他: "C02 Sequestration and Fate of Organic Matters within Seagrass (Zostera marina) Ecosystem"Journal of Chemical Engineering of Japan. 36・4. 417-427 (2003)

Akira Suzuki 等人：“海草（大叶藻）生态系统中有机物的 C02 封存和归宿”日本化学工程学报 36・4（2003 年）。

Beatriz E.Casareto, Koichi Abe, Yoshio Ishikawa, Keiji Nitta, Yoshimi Suzuki: "Bio-aerosols in the Geo-sphere Module of CEEF."Eco-Engineering. 16(1). 39-44 (2004)

Beatriz E.Casareto、Koichi Abe、Yoshio Ishikawa、Keiji Nitta、Yoshimi Suzuki：“CEEF 地圈模块中的生物气溶胶。”生态工程。

Y.Suzuki, B.E.Casareto, K.Kurosawa: "Import and export fluxes of HMW-DOC and LMW-DOC on a coral reef at Miyako island, Okinawa."Coral Reef. 21. 143-148 (2002)

Y.Suzuki、B.E.Casareto、K.Kurosawa：“冲绳宫古岛珊瑚礁上 HMW-DOC 和 LMW-DOC 的进出口通量。”珊瑚礁。

鈴木 款他: "A model of the cycling and export of nitrogen in Fukido mangrove in Ishigaki Island"Journal of Chemical Engineering of Japan. 36・4. 411-416 (2003)

Akira Suzuki 等：“石垣岛 Fukido 红树林的氮循环和输出模型”日本化学工程学报 36・4（2003 年）。

鈴木 款他: "Import and export fluxes of HMW-DOC and LMW-DOC on a coral reef at Miyako Island, Okinawa"Coral Reef. 21. 143-148 (2002)

Akira Suzuki 等人：“冲绳宫古岛珊瑚礁上 HMW-DOC 和 LMW-DOC 的导入和导出通量”Coral Reef. 21. 143-148 (2002)