20年間のフィールド実験で,上昇したCO2に対するC3とC4の予期せぬ逆転
Peter B Reich1,2, Sarah E Hobbie3, Tali D Lee4
1Department of Forest Resources, University of Minnesota, St. Paul, MN 55108, USA. preich@umn.edu.
まとめ
二酸化炭素 (eCO2) の増加に対する植物の反応は,時間とともに変化します. 最初はC3プラントがeCO2より恩恵を受けましたが,後にC4プラントはより大きな反応を示し,既存のパラダイムに挑戦しました.
科学分野:
- 植物生理学
- エコロジー
- グローバル 変化 生物学
背景:
- C4プラントは一般的にC3プラントよりも高濃度のCO2 (eCO2) に反応しない.
- このC3からC4のコントラストは植物科学でよく知られている概念です.
研究 の 目的:
- 植物がeCO2に長期的に反応するかを調査する.
- 継続的なeCO2条件下でのC3-C4コントラストパラダイムをテストする.
主な方法:
- 88の草原を対象とした20年間の CO2濃縮実験です
- 環境とeCO2の下でのC3とC4のプロットのバイオマスと土壌窒素鉱化率のモニタリング
主要な成果:
- eCO2に対するバイオマス反応は,当初はC3植物に好意を示したが,その後はC4植物に変化した.
- 土壌の窒素鉱化率は相互のシフトを示し,バイオマス反応に影響を与えました.
- 観測された逆転は,確立されたC3-C4 eCO2応答パラダイムに挑戦しています.
結論:
- eCO2に対する長期的な植物反応は,短期的な予測と大きく異なる可能性があります.
- eCO2反応におけるC3-C4コントラストは静的ではなく,時間とともに逆転する可能性があります.
- ダイナミックな反応を理解することは,地球規模の変化の下の生態系の変化を予測するのに不可欠です.
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