地球規模の土壌呼吸記録の温度に関連した上昇
Ben Bond-Lamberty1, Allison Thomson
1Pacific Northwest National Laboratory, Joint Global Change Research Institute at the University of Maryland-College Park, 5825 University Research Court, Suite 3500, College Park, Maryland 20740, USA. bondlamberty@pnl.gov
Nature
|March 26, 2010
まとめ
主要な炭素の流れである土壌呼吸 (R(S) は,気温上昇によってますます影響を受けています. この研究は,温度異常とR ((S)) の間の有意な正の相関を明らかにし,地球の炭素循環の変化を示しています.
科学分野:
- 地球と環境科学 地球と環境科学
- 気候科学 気候科学
- エコロジー エコロジー エコロジー
背景:
- 土壌呼吸 (R(S)) は,土壌から二酸化炭素 (CO(2) を放出する,地球上の二番目に大きな炭素の流れを表しています.
- R (S) ダイナミクスを理解することは,気候変動のモデリングに不可欠ですが,測定上の課題のために,グローバルフルースは依然として十分に制限されていません.
- 既存の研究は,R (S) が気候変動に対応すべきだと示唆しているが,観測証拠は限られている.
研究 の 目的:
- 気候,特に気温が,地球全体の土壌呼吸率に及ぼす影響を調査する.
- 総合的なグローバルなデータセットを使用して,土壌呼吸における時間的な傾向を特定する.
- 温度変化に対する土壌呼吸の感受性を定量化するために.
主な方法:
- 40年にわたる土壌呼吸 (R) 測定のグローバルデータベースをまとめました.
- 高解像度の歴史的な気候データと統合されたR (((S)) データ.
- 気候,葉面,窒素堆積,CO2測定技術などの要因を考慮するために統計分析を使用しました.
主要な成果:
- R ((S)) の以前に認識されなかった時間的な傾向は,混同変数を制御した後で特定されました.
- 空気温の異常は,土壌呼吸の変化と有意な正の相関関係を示した.
- 2008年のグローバルR (((S) は98 +/- 12 Pg Cと推定され,1989-2008年から0.1 Pg C yr ((-1) 増加しました.
結論:
- グローバルな土壌呼吸は,気温の変化に敏感であることが実証されており,Q ((10) は 1.5.5 です.
- 観測されたR (S) の増加は,地球上の炭素循環が加速していることを示唆している.
- 肯定的なフィードバックとは限らないが,この結果は,気候変動が炭素の動態に及ぼす影響と一致している.
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