南米の汚染されていない森林からの窒素の損失は,主に溶解した有機化合物によるものです
Steven S Perakis1, Lars O Hedin
1Department of Ecology and Evolutionary Biology, Corson Hall, Cornell University, Ithaca, New York 14853, USA. sperakis@usgs.gov
Nature
|January 25, 2002
まとめ
汚染されていない温帯雨林における窒素の損失は主に有機的であり,無機的窒素ではない. この発見は,既存のモデルに異議を唱え,有機窒素は森林の栄養循環の研究で考慮されるべきであることを示唆しています.
科学分野:
- エコロジー エコロジー エコロジー
- バイオジオケミストリー バイオジオケミストリー
- 森林科学 森林科学 森林科学
背景:
- 窒素循環モデルでは,温帯雨林からの無機窒素損失 (窒素酸塩,アンモニアム) を想定することが多い.
- 窒素は高度に移動性があり,土壌と水に損失をもたらします.
- 人間の活動により,世界の窒素循環が大きく変化し,自然過程の評価が複雑になりました.
研究 の 目的:
- 汚染されていない南米の温帯雨林の窒素喪失経路を調査する.
- 原始的な生態系における窒素損失パターンを,人間による影響を受けた地域における窒素損失パターンを比較する.
- 森林の窒素循環の概念的および数学的モデルを情報提供し,精錬する.
主な方法:
- 100の原生,汚染されていない温帯雨林のストリーム化学データを収集した.
- 分析された窒素形態 (窒素酸塩,アンモニアム,溶解した有機窒素) を流水で分析した.
- 研究サイトにおける栄養素サイクルに影響を与える幅広い環境要因を調査した.
主要な成果:
- 異なる環境条件にもかかわらず,研究されたすべての森林で窒素の損失の一貫したパターンが観察されました.
- 流水中の窒素濃度が極めて低く,窒素とアンモニアの比率が1以下であった.
- 溶解した有機窒素がこれらの森林からの窒素損失の大部分を占めていることが決定されました.
結論:
- 温帯森林の窒素の損失は,主に溶けた有機窒素によるもので,これは一般的なモデルとは違います.
- 既存のモデルは,有機窒素の損失を考慮するために改訂する必要があるかもしれません.
- 有機窒素を考慮することは,温帯雨林の生態系における栄養素の制限を理解するために極めて重要です.
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