生態系レベルでの呼吸の温度感度のグローバル収束
Miguel D Mahecha1, Markus Reichstein, Nuno Carvalhais
1Max Planck Institute for Biogeochemistry, 07745 Jena, Germany. mmahecha@bgc-jena.mpg.de
まとめ
地上生態系の呼吸の温度に対する感受性 (Q10)) は,バイオームと温度において一定であるように見える. この発見は,現在のモデルが予測するよりも弱い気候-炭素サイクルフィードバックを示唆しています.
科学分野:
- エコロジー エコロジー エコロジー
- 気候科学 気候科学
- バイオジオケミストリー バイオジオケミストリー
背景:
- 陸地から排出される二酸化炭素 (CO2) は,地球規模の炭素循環の重要な構成要素です.
- 生態系呼吸の温度感受性を理解することは,気候フィードバックの予測に不可欠です.
研究 の 目的:
- 地上生態系における呼吸の温度感度 (Q(10)) を,地球上の様々な場所において決定する.
- 年平均気温とバイオームの種類がQ10に与える影響を調査する.
主な方法:
- 60のFLUXNETサイトからデータを活用した.
- Q(10) を混同因子から隔離するために新しい方法論を採用しました.
- 光合成と呼吸の変動性の関係を分析した.
主要な成果:
- Q10は,年間平均気温とバイオームから大きく独立していることが判明した.
- 約1.4 +/- 0.1.1.の一貫したQ(10) 値を決定しました.
- サイトごとに光合成-呼吸関係における有意な変動が観察されました.
結論:
- 地上生態系の呼吸の温度感度は,これまで考えられていたよりも均一である.
- これらの発見は,現在のモデルが示唆しているよりも,気候-炭素サイクルフィードバックがあまり顕著ではないことを示している可能性があります.
- 経験的な呼吸データに基づく炭素サイクルモデルの精錬の必要性を強調する.
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