溶解した有機物質が河川水中のミケルのような微粒子に自己組織化
Martin Kerner1, Heinz Hohenberg, Siegmund Ertl
1University of Hamburg, Institute for Hydrobiology and Fishery Science, D-22765 Hamburg, Zeiseweg 9, Germany. kerner@uni-hamburg.de
Nature
|March 14, 2003
まとめ
溶解した有機炭素 (DOC) のアビオティック・アグレゲーションにより,微粒子が形成され,微生物のループを回避する. この非生物学的プロセスは,水生生態系における炭素の移転に大きく貢献し,現在のモデルに挑戦しています.
科学分野:
- 環境科学 環境科学
- 水生生態学 水生生態学とは
- バイオジオケミストリー バイオジオケミストリー
背景:
- 微生物のループは,水中のシステムにおける細菌による溶解有機物質 (DOM) の有機粒子物質への変換を記述する.
- このプロセスは,より高いトロフィックレベルへのエネルギー転送に不可欠であり,水生生物の生産性に影響を与えます.
研究 の 目的:
- 溶解した有機炭素 (DOC) の微粒子への無生物的集積を調査する.
- このアビオティック経路が,炭素転送における微生物のループを回避するかどうかを判断する.
主な方法:
- 検査室での不妊濾過された河川水の化.
- 溶解した有機炭素 (DOC) を微粒子 (0.4-0.8ミクロメートル) に集積した分析.
- 炭素経路を追跡するための安定炭素同位体分析.
主要な成果:
- 溶解した有機炭素 (DOC) の最大25%が,無生物的に微粒子に集約されます.
- 集積は,低分子量から高分子量DOCの拡散によって発生した.
- 微粒子の組成は,プランクトン菌類の食物として適性を示唆し,同位体分析によって確認されました.
結論:
- 微粒子のアビオティック形成は,微生物のループを回避して,DOCをより高いトロフィックレベルに転送するための直接的な経路を提供します.
- 水系における炭素循環に関する現在の理解は,この無生物的集積経路を含むように修正する必要があるかもしれません.
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