淡水生態系. 淡水生態系. 淡水生態系. 淡水生態系. 淡水生態系. 淡水生態系. 実験的な栄養素添加は,川の生態系からの陸上の炭素の損失を加速させる
Amy D Rosemond1, Jonathan P Benstead2, Phillip M Bumpers3
1Odum School of Ecology, University of Georgia, Athens, GA 30602, USA. rosemond@uga.edu.
まとめ
栄養素汚染は,陸上の有機炭素の河川の分解を大幅に加速し,貯蔵時間を約50%短縮します. この急速な炭素の損失は,河川の食物網と生態系サービスに影響を及ぼします.
科学分野:
- 淡水生態学 淡水生態学とは
- 環境化学 環境化学
- 生態系科学 生態系科学 生態系科学
背景:
- 淡水生態系における栄養素の汚染は,しばしば藻類による炭素収縮の増大につながります.
- 河川における陸上有機炭素の運命を左右する栄養素濃縮の影響は十分に理解されていません.
- 陸上の有機炭素は河川の食物網を支えるものであり,二酸化炭素 (CO2) の源である.
研究 の 目的:
- 栄養素の濃縮が河川生態系における陸上の有機炭素の居住時間および処理にどのように影響するか調査する.
- 栄養素の添加が,地上の炭素の投入と藻類の炭素収縮のバランスを変化させるかどうかを判断する.
- 変化した炭素循環が河川の生態系サービスに及ぼす影響を評価する.
主な方法:
- 27年間,窒素 (N) とリン (P) の添加をフルストリームで行いました.
- 栄養素の濃縮下での陸上の有機炭素の滞在時間の比較と基準条件の比較.
- 年間陸上有機炭素の投入量とその枯渇率の定量化.
主要な成果:
- 栄養素濃縮では,陸上の有機炭素の居住時間が約50%短縮されました.
- 陸上の有機炭素の年間投入量は,破壊的な食物網によって急速に消費されました.
- デトリタル食物網の栄養素共同制限は,窒素とリン添加によって緩和されました.
結論:
- 栄養素の汚染は,川の生態系から陸上の有機炭素の損失を加速させる.
- 栄養素汚染による陸上の炭素損失の割合は,藻類による炭素増加を上回る可能性があります.
- 変化した陸上の炭素循環は,河川ネットワークの重要な生態系サービスを減少させます.
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