CO2の上昇と温暖化により悪化した 干ばつによる炭化物損失
Quan Quan1, Jian Zhou1, Paul J Hanson2
1Soil and Crop Sciences Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA.
まとめ
極端な干ばつや温暖化により 炭酸ガスの損失が増加します 二酸化炭素 (eCO2) の増加は,この効果をさらに悪化させ,陽性な炭素-気候フィードバックを増加させます.
科学分野:
- 気候変動に関する研究
- 生態系エコロジー
- 生地化学
背景:
- 極端な干ばつ現象は 気候変動により増加しています
- 温暖化と二酸化炭素の増加による生態系炭素動態への影響は十分に理解されていません.
研究 の 目的:
- 異なる温暖化と二酸化炭素上昇のシナリオの下で,泥炭地帯の炭素動態に対する極端な干ばつの影響を調査する.
- 温暖化と二酸化炭素の上昇が 干ばつ時の生態系の生産性に影響を与える仕組みを理解する
主な方法:
- 5つの加熱処理で泥沼実験が行われました.
- 処理には,環境CO2 (aCO2) と高CO2 (eCO2) の条件が含まれていた.
- 2021年には2ヶ月の極端な干ばつが発生した.
主要な成果:
- 極端な干ばつが,aCO2とeCO2の両方で,生態系の純生産性 (NEP) を著しく低下させた.
- 温暖化により,特にeCO2の下では,干ばつ期間中のNEPの減少が悪化しました.
- 温暖化に起因する地下水層の減少とCO2増加した基板の利用可能性が悪化を促した.
結論:
- 将来の気候条件は 極端な干ばつで泥炭地帯からの炭素の損失を拡大します
- 気候変動が生態系から炭素を放出する ポジティブな炭素-気候フィードバックループを 強調しています
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