2003 Fiscal Year Annual Research Report

海水中の有機物の挙動と放射性核種相互の定量的関係

Research Project

Project/Area Number	13480155
Research Institution	Shizuoka University
Principal Investigator	鈴木款静岡大学, 理学部, 教授 (30252159)
Co-Investigator(Kenkyū-buntansha)	カサレトベアトリス (株)水圏科学コンサルタント, 主任研究員山田正俊静岡大学, 放射生態学研究センター, 主任研究官山本政儀金沢大学, 理学部, 助教授 (10121295)
Keywords	放射性核種 / 有機物 / 相互関係 / 生物生産 / 有機物分解 / pb210,P-23,Th-234 / 分解課程 / 水槽実験
Research Abstract	閉鎖系500L容器(ただし培養水の循環にエアレーションを行う)を静岡県焼津水産試験場内に設置し、駿河湾深層水取水施設で採水している水深100mの海水を用いて培養を行った。培養7日で、植物プランクトンがクロロフィルa量ベースで数千倍に増加した(0.01μg/L〜3.7μg/Lに増加)。この植物プランクトンの増加は、栄養塩類と適度な光によって引き起こされたと考えられる。植物プランクトンの増加に伴って生産された溶存有機物を利用し、バクテリアが植物プランクトンに遅れて増加し、従属栄養性微小鞭毛虫類(HNF)および無殻繊毛虫類がバクテリアに同調して増加した。培養7-12日目で栄養塩類(硝酸塩NO_3およびリン酸塩PO_4)が枯渇すると、植物プランクトンは急激に減少し、.炭素量ベースでみるとプランクトン組成におけるバクテリア、HNFおよび繊毛虫類の割合が増加した。この結果は、培養後期においては微生物食物連鎖が駆動していることを示唆している。また、植物プランクトンの増殖によって、ケイ酸塩濃度が13μmol l^<-1>から4μmol l^<-1>に減少したが、培養最終日には11μmol l^<-1>に増加した。これは、バクテリアによって有機物の分解と共に珪藻類のケイ酸が溶解したことによるものであり、栄養塩類のリサイクルメカニズムについての解明に繋がるものである。これらの条件において粒子態有機物をサイズ別(500μm以上、500〜105μm、105〜25μm、25〜0.4μm)に分離し、有機炭素と放射性物質(Pb-210、Po-210、P-32とTh-234)挙動との関係を検討した。Th-234では溶存態^<234>Thは検出されず、また粒子態^<234>Thの80%が0.6-500μm粒子画分にあった。実験開始から生物の活動が著しく停滞期までの期間は、O.4-500μm粒子サイズの^<234>Thが約150dpm/m^3/dayの割合で除去される。クロロフィル濃度が著しく上昇した期間(プランクトンブルーム初期)は、粒子態^<234>Thの海水からの除去割合が極めて小さい。分解期では海水中の^<234>Thはすべて除去された。つまり培養実験では海水中の懸濁態Thの挙動が粒子サイズ0.4-25μmのliving有機物に支配されていたことが考えられた。

Research Products
(18 results)

All Other

All Publications (18 results)

[Publications] 鈴木款他: "Phytoplankton Decomposition Process (PDP) Model Dealing with Carbon and Nitrogen Budget on Particulate Organic Matter"Journal of Chemical Engineering of Japan. 36・4. 401-410 (2003)
[Publications] 鈴木款他: "Possibility of high C02 fixation Rate by Coral Reef Ecosystems"Greeenhouse Gas Control Technologies. 11. 817-822 (2003)
[Publications] 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)
[Publications] 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)
[Publications] 鈴木款他: "Import and export fluxes of HMW DOC and LMW DOC on a coral reef at Miyako Island, Okinawa"Proceedings of 9thICRS, Bali. 1. 555-559 (2003)
[Publications] 鈴木款他: "Refractory and Iabile organic carbon in coral reef seawater"Galaxes, JCRS. 5. 11-19 (2003)
[Publications] 鈴木款: "ROLE OF DECOMPOSITION, AGGREGATION AND DISSOLUTION OF DIATOMS IN THE SINKING FLUX OF ORGANIC MATTER TO THE MESOPELAGICC LAYER"ASLO/TOS 2004 Ocean Research Conference. (2004)
[Publications] 山本政儀他: "Anomalously high ^<234>U/^<238>U activity ratios of Tatsunokuchi hot spring waters, Ishikawa Prefecture, Japan"J.Radioanal.Nucl.Chem. 255・2. 369-373 (2003)
[Publications] 山本政儀他: "Application of low background -ray spectrometry to environmental monitoring samples ---water leaching treatment for ^<40>K-removal---"J.Radioanal.Nucl.Chem. 255・1. 211-215 (2003)
[Publications] 山本政儀他: "Estimation of fast neutron fluence released by the Tokai-mura criticality accident from ^<54>Mn in soils collected from the JCO grounds"J.Radioanal.Nucl.Chem. 255・2. 359-364 (2003)
[Publications] 山本政儀他: "Low level measurement of cosmogenic radionuclide ^<22>Na in fresh water by ultra low-background γ-ray spectrometry after simple radiochemical separation"J.Radioanal.Nucl.Chem. 258. 250-258 (2003)
[Publications] 山本政儀他: "能登半島沿岸域の海藻試料に置ける^<228>Ra/^<226>Ra比の季節変動"日本放射化学学会・第46回放射化学討論会. (2003)
[Publications] 山田正俊他: "210Pb and 234Th insettling particles collected by time-series sediment traps in the Okinawa Trough"Deep-Sea Research II. 50・2. 487-501 (2003)
[Publications] 山田正俊他: "Behavior of 234Th with organic matter in the Suruga Bay"4thEuropean Meeting on Environmental Chemistry. (2003)
[Publications] 山田正俊他: "相模湾海水を利用した放射性核種Th-234と有機物の関係について"地球惑星関連学会合同大会. (2004)
[Publications] Beatriz CASARETO他: "Bio-aerosols in the Geo-sphere Module of CEEF"Eco-Engineering. 16・1. 39-44 (2004)
[Publications] Beatriz CASARETO他: "Particulate organic carbon budget and POC flux in a fringing coral reef at Miyako Island, Okinawa"Proceedings of 9thICRS, Bali. 1. 95-100 (2003)
[Publications] Beatriz CASARETO: "ORGANIC MATTER BEHAVIOR DURING MESOCOSM INCUBATION OF UNDISTURBED NESOPELASGIC WATERS"ASLO/TOS 2004 Ocean Research Conference. (2004)

2003 Fiscal Year Annual Research Report

海水中の有機物の挙動と放射性核種相互の定量的関係

Principal Investigator

鈴木 款 静岡大学, 理学部, 教授 (30252159)

Research Products

[Publications] 鈴木 款他: "Phytoplankton Decomposition Process (PDP) Model Dealing with Carbon and Nitrogen Budget on Particulate Organic Matter"Journal of Chemical Engineering of Japan. 36・4. 401-410 (2003)

[Publications] 鈴木 款他: "Possibility of high C02 fixation Rate by Coral Reef Ecosystems"Greeenhouse Gas Control Technologies. 11. 817-822 (2003)

[Publications] 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)

[Publications] 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)

[Publications] 鈴木 款他: "Import and export fluxes of HMW DOC and LMW DOC on a coral reef at Miyako Island, Okinawa"Proceedings of 9thICRS, Bali. 1. 555-559 (2003)

[Publications] 鈴木 款他: "Refractory and Iabile organic carbon in coral reef seawater"Galaxes, JCRS. 5. 11-19 (2003)

[Publications] 鈴木 款: "ROLE OF DECOMPOSITION, AGGREGATION AND DISSOLUTION OF DIATOMS IN THE SINKING FLUX OF ORGANIC MATTER TO THE MESOPELAGICC LAYER"ASLO/TOS 2004 Ocean Research Conference. (2004)

[Publications] 山本 政儀他: "Anomalously high ^<234>U/^<238>U activity ratios of Tatsunokuchi hot spring waters, Ishikawa Prefecture, Japan"J.Radioanal.Nucl.Chem. 255・2. 369-373 (2003)

[Publications] 山本 政儀他: "Application of low background -ray spectrometry to environmental monitoring samples ---water leaching treatment for ^<40>K-removal---"J.Radioanal.Nucl.Chem. 255・1. 211-215 (2003)

[Publications] 山本 政儀他: "Estimation of fast neutron fluence released by the Tokai-mura criticality accident from ^<54>Mn in soils collected from the JCO grounds"J.Radioanal.Nucl.Chem. 255・2. 359-364 (2003)

[Publications] 山本 政儀他: "Low level measurement of cosmogenic radionuclide ^<22>Na in fresh water by ultra low-background γ-ray spectrometry after simple radiochemical separation"J.Radioanal.Nucl.Chem. 258. 250-258 (2003)

[Publications] 山本 政儀他: "能登半島沿岸域の海藻試料に置ける^<228>Ra/^<226>Ra比の季節変動"日本放射化学学会・第46回放射化学討論会. (2003)

[Publications] 山田 正俊他: "210Pb and 234Th insettling particles collected by time-series sediment traps in the Okinawa Trough"Deep-Sea Research II. 50・2. 487-501 (2003)

[Publications] 山田 正俊他: "Behavior of 234Th with organic matter in the Suruga Bay"4thEuropean Meeting on Environmental Chemistry. (2003)

[Publications] 山田 正俊他: "相模湾海水を利用した放射性核種Th-234と有機物の関係について"地球惑星関連学会合同大会. (2004)

[Publications] Beatriz CASARETO他: "Bio-aerosols in the Geo-sphere Module of CEEF"Eco-Engineering. 16・1. 39-44 (2004)

[Publications] Beatriz CASARETO他: "Particulate organic carbon budget and POC flux in a fringing coral reef at Miyako Island, Okinawa"Proceedings of 9thICRS, Bali. 1. 95-100 (2003)

[Publications] Beatriz CASARETO: "ORGANIC MATTER BEHAVIOR DURING MESOCOSM INCUBATION OF UNDISTURBED NESOPELASGIC WATERS"ASLO/TOS 2004 Ocean Research Conference. (2004)

鈴木款静岡大学, 理学部, 教授 (30252159)

[Publications] 鈴木款他: "Phytoplankton Decomposition Process (PDP) Model Dealing with Carbon and Nitrogen Budget on Particulate Organic Matter"Journal of Chemical Engineering of Japan. 36・4. 401-410 (2003)

[Publications] 鈴木款他: "Possibility of high C02 fixation Rate by Coral Reef Ecosystems"Greeenhouse Gas Control Technologies. 11. 817-822 (2003)

[Publications] 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)

[Publications] 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)

[Publications] 鈴木款他: "Import and export fluxes of HMW DOC and LMW DOC on a coral reef at Miyako Island, Okinawa"Proceedings of 9thICRS, Bali. 1. 555-559 (2003)

[Publications] 鈴木款他: "Refractory and Iabile organic carbon in coral reef seawater"Galaxes, JCRS. 5. 11-19 (2003)

[Publications] 鈴木款: "ROLE OF DECOMPOSITION, AGGREGATION AND DISSOLUTION OF DIATOMS IN THE SINKING FLUX OF ORGANIC MATTER TO THE MESOPELAGICC LAYER"ASLO/TOS 2004 Ocean Research Conference. (2004)

[Publications] 山本政儀他: "Anomalously high ^<234>U/^<238>U activity ratios of Tatsunokuchi hot spring waters, Ishikawa Prefecture, Japan"J.Radioanal.Nucl.Chem. 255・2. 369-373 (2003)

[Publications] 山本政儀他: "Application of low background -ray spectrometry to environmental monitoring samples ---water leaching treatment for ^<40>K-removal---"J.Radioanal.Nucl.Chem. 255・1. 211-215 (2003)

[Publications] 山本政儀他: "Estimation of fast neutron fluence released by the Tokai-mura criticality accident from ^<54>Mn in soils collected from the JCO grounds"J.Radioanal.Nucl.Chem. 255・2. 359-364 (2003)

[Publications] 山本政儀他: "Low level measurement of cosmogenic radionuclide ^<22>Na in fresh water by ultra low-background γ-ray spectrometry after simple radiochemical separation"J.Radioanal.Nucl.Chem. 258. 250-258 (2003)

[Publications] 山本政儀他: "能登半島沿岸域の海藻試料に置ける^<228>Ra/^<226>Ra比の季節変動"日本放射化学学会・第46回放射化学討論会. (2003)

[Publications] 山田正俊他: "210Pb and 234Th insettling particles collected by time-series sediment traps in the Okinawa Trough"Deep-Sea Research II. 50・2. 487-501 (2003)

[Publications] 山田正俊他: "Behavior of 234Th with organic matter in the Suruga Bay"4thEuropean Meeting on Environmental Chemistry. (2003)

[Publications] 山田正俊他: "相模湾海水を利用した放射性核種Th-234と有機物の関係について"地球惑星関連学会合同大会. (2004)