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Title: 酪農業の進展と風蓮湖の生物生産構造変化
Other Titles: The Structural Changes in Biological Productivity due to the Progress of Dairy in Lake Furen
Authors: 門谷, 茂1 Browse this author →KAKEN DB
真名垣, 友樹2 Browse this author
柴沼, 成一郎3 Browse this author
Authors(alt): Montani, Shigeru1
Managaki, Yuki2
Shibanuma, Seiichiro3
Keywords: 汽水湖
Issue Date: 31-Aug-2011
Publisher: 日本海洋学会沿岸海洋研究会
Journal Title: 沿岸海洋研究
Volume: 49
Issue: 1
Start Page: 59
End Page: 67
Abstract: 2006年5月から2008年11月にかけて風蓮湖とその流入河川の水質および堆積物の性状を調査した.風蓮湖における河川水と海水の混合形態は潮汐によって変化し,下げ潮時にはエスチュアリー循環の弱混合型であり,上げ潮時は強混合型である.酪農の影響をうけた高濃度の栄養塩は風蓮湖に流れ込み,河口域でほぼ植物プランクトンにより消費されることが示された.2007年4月〜2008年3月までのデータを一年として,平均流量を用いた主要3河川による,風蓮湖への年間負荷量はDINで529t, DIPで58tと計算された.さらに,負荷された栄養塩を利用した植物プランクトンの推定基礎生産量は2,533〜4,550t Cとなり,負荷された栄養塩のうち,DINで54〜98%,DIPは河川のものだけで考えるとほぼ100%消費されていることが分かった.湖内に分布するPOCは,河川由来のものよりも湖内で生産されたものの方が,割合が大きかった.また,湖内で生産された粒子は,容易に湖外に流出しない傾向にあった。また,堆積物表層のシルト含有率は,湖奥部中央〜最奥部にかけて高くなっていることから,水柱の粒子が湖奥部に選択的に堆積している可能性が示された.
We investigated the quality of water of the inflow river in Lake Furen from May, 2006 through November, 2008. The mixed form of river water and the seawater in Lake Furen changed by ebb and flood tides and was weak mixed type of the estuary circulation at the time of the ebb tide and was strong mixed type at the time of the high tide. Highly concentrated nutrients from dairy farming drainage flowed into Lake Furen, and we examined the amount of nutrients used by phytoplankton in the estuary. We calculated the data from April, 2007 to March, 2008, which was 529 ton in DIN and 58 ton in DIP when we estimated load quantity in the year to Lake Furen by 3 main rivers, using the mean flow quantity as a minute for one year. Furthermore, this value became 2,533〜4,550 ton C when the amount of phytoplankton primary production using inputted nutrients was assumed to be 54-98% in DIN case, and approximately 100% in DIP case when we assumed only inputted nutrients from the river. In addition, the particles produced in the lake tended to not flow easily outside the lake. In addition, we estimated the silt content of, the sediment outer layer at various depths, and we revealed that the particles of the water column were selectively deposited as the silt became higher at inner part of the lake.
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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