温暖化に反応する土壌全体の炭素流量
Caitlin E Hicks Pries1, C Castanha2, R C Porras2
1Climate Sciences Department, Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. cehpries@lbl.gov mstorn@lbl.gov.
まとめ
あらゆる深さの土壌の温暖化により 二酸化炭素の放出が大幅に増加し 気候変動の予測に影響を与えました この土壌全体の温暖化研究は 表面レベルでの以前の実験よりも 土壌の呼吸反応が大きいことを示しています
科学分野:
- 環境科学
- 気候科学
- 土壌科学
背景:
- 土壌の有機炭素は 膨大な量の炭素を貯蔵し 気候予測に影響します
- 土壌の有機炭素の分解は 重要な気候フィードバックであり 不確実性の源です
- 過去の現地温暖化実験では,土壌全体のプロファイルがテストされていません.
研究 の 目的:
- 温暖化に対する全土プロフィールのインサイト反応を調査する.
- 二酸化炭素 (CO2) 生産に対する深層土壌温暖化の影響を定量化する.
- 表面レベルでの実験と気候モデルと比較する.
主な方法:
- ミネラル土壌で深層温暖化実験を行いました
- 土壌全体に4°Cの加熱処理を行った.
- すべての土壌の深さで測定されたCO2の生産.
主要な成果:
- 温暖化下のすべての土壌の深度からCO2の生産が著しく増加しました.
- 年間土壌呼吸は34%から37%の大幅な増加を示した.
- すべての土壌の深さは,十年にわたる炭素の分解に関連して,同様の温度感性を示しました.
結論:
- 表面のみの温暖化実験と比較して,土壌全体の温暖化により大きな土壌呼吸反応が生じます.
- 気候変動のフィードバックに 深い土壌の過程を考慮する重要性を強調しています
- この研究は,気候モデルを改良し,予測の不確実性を減らすために重要なデータを提供します.
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