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過栄養内湾(洞海湾) における粒子状物質の生化学的特徴と 鉛直輸送過程の季節変化

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Title: 過栄養内湾(洞海湾) における粒子状物質の生化学的特徴と 鉛直輸送過程の季節変化
Other Titles: Seasonal Changes in Biochemical Characteristics and Vertical Transport of Particulate Organic Matter in Hypertrophic Dokai Bay, Japan
Authors: 濱田, 建一郎1 Browse this author
上田, 直子2 Browse this author
山田, 真知子3 Browse this author
多田, 邦尚4 Browse this author →KAKEN DB
門谷, 茂5 Browse this author →KAKEN DB
Authors(alt): Hamada, Kenichiro 1
Ueda, Naoko2
Yamada, Machiko3
Tada, Kuninao4
Montani, Shigeru5
Keywords: 粒子状物質
Issue Date: 30-Aug-2010
Publisher: 日本海洋学会沿岸海洋研究会
Journal Title: 沿岸海洋研究
Volume: 48
Issue: 1
Start Page: 75
End Page: 85
Abstract: 過栄養内湾である洞海湾において季節毎に粒子状物質の採取を行い,その生化学的特徴から起源を推定した.また,有機態炭素やChlorophyll aを指標として粒子状物質の鉛直輸送過程の季節変化について考察した.その結果,過栄養化した内湾の見かけ上の沈降粒子束の多寡は,密度成層の強弱による海水の上下混合に支配されていることが確認された.水柱中に存在する懸濁粒子の主要な起源は植物プランクトンと推定されたが,セディメントトラップに捕集された粒子状物質に占める懸濁粒子由来の割合は有機態炭素を指標としたとき,約35%であった.有機態炭素を指標として水柱中の現存量と沈降除去量を比較検討したところ,以下の3パターンが存在した.(1)現存量は多いが成層期のためフラックスは小さい(夏季).(2)現存量は多くないが循環期のためフラックスは大きい(春季・秋季).(3)循環期だが沈降除去率が小さいためフラックスも小さい(冬季).また,植物プランクトンを主な起源とする粒子状物質の鉛直フラックスをChlorophyll aを指標として検討した結果,季節毎に変化する植物プランクトン量と密度成層の強弱との相互関係でフラックスは決まると考えられた.
We used biochemical characteristics to infer the origin of particulate organic matter collected every season in a hypertrophic embayment (Dokai Bay, Japan). In addition, we evaluated seasonal changes in the vertical transport processes within the embayment, using organic carbon and chlorophyll a as indices. Our findings suggest that mass flux was influenced by the strength of density stratification and mixing of the water mass. The main source of suspended particulate matter was presumed to have originally been phytoplankton. However, using organic carbon as an index, we determined that suspended particulate matter accounted for only about 35% of the particulate organic matter collected by sediment traps. We compared the standing stock of particulate organic carbon and the amount removed through sinking in the water column and found three patterns. (1) When the water column was highly stratified in summer, the particulate flux was small, although the standing stock was high. (2) When the water column was well mixed in spring and autumn, the particulate flux was high, although the standing stock was lower. (3) When the water column was mixed in winter, the particulate flux was small, since the removal ratio was low. Finally, using chlorophyll a as an index for the vertical flux of particulate organic matter of phytoplankton origin, we determined that this flux was controlled by the relationship between the amount of phytoplankton and the strength of density stratification, both of which varied seasonally.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 門谷 茂

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