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タイトル: 小川原湖の水質変動と物質循環
その他のタイトル: Variability of Water Quality and Nutrients Cycle in Lake Ogawara
著者: 西田, 修三 / 鈴木, 誠二
著者(別表記) : Nishida, Shuzo / Suzuki, Seiji
発行日: 2007年 7月
出版者: 日本水産工学会
引用: 水産工学, 44(1), pp,39-43; 2007
抄録: Lake Ogawara, located in Northern Japan, is a brackish lake with the surface-area of 63km^2. The maximum depth is about 25m, and approximately 12psu of salt water exists in a lower layer under the depth of 20m throughout the year. Lots of Corbicula Japonica are living in the lake, and about 2500 tons are taken out as fishery product. We develop an ecological model to consider the biochemical processes of the bivalve, that calculates water temperature, salinity, chlorophyll-a, inorganic nitrogen and phosphorous, organic nitrogen and phosphorous, COD and dissolved oxygen. We make one-dimensional calculations to clarify the seasonal variabilities in water qualities and nutrients cycle, and use a three-dimensional hydrodynamic model coupled with the ecological model to clarify the spatial distributions of water qualities. It is found that an increase of nutrient supply from the lower layer, caused by the intense vertical mixing, makes phytoplankton blooming active, and that the spatial distribution of the phytoplankton greatly depends on the habitat distribution of Corbicula Japonica. The calculation results for the nutrients cycle show that the amount of phosphorous consumed at primary production is more dependent on the biochemical and physical processes occurred in the lake than the inflow load supply. About 20% of primary production is ingested by Corbicula Japonica, and its purifying function is about 30% for COD. Because Corbicula Japonica stores nitrogen internally, the concentration of total nitrogen in the lake water is restrained and decreases in October in spite of the time of the maximum primary production.
記述: 平成18年度日本水産工学会秋季シンポジュウム「物質循環を指標とした貝類漁場及び周辺環境の評価と管理」講演
キーワード: ヤマトシジミ / 小川原湖 / 物質循環 / 生態系モデル / シミュレーション
URI: http://hdl.handle.net/10069/21513
ISSN: 09167617
関連リンク : http://ci.nii.ac.jp/naid/110006366651
権利: 日本水産工学会 / 本文データは学協会の許諾に基づきCiNiiから複製したものである
資料タイプ: Journal Article
原稿種類: publisher
出現コレクション:060 学術雑誌論文

引用URI : http://hdl.handle.net/10069/21513



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