大気中のCO2が増加した状態でのより速い分解は,土壌の炭素貯蔵を制限する
Kees Jan van Groenigen1, Xuan Qi, Craig W Osenberg
1Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ 86011, USA.
Science (New York, N.Y.)
|April 26, 2014
まとめ
大気中の二酸化炭素 (CO2) の上昇は,土壌の炭素供給と微生物の分解を促進します. この増加した土壌の炭素循環は,全体的な炭素蓄積を制限し,気候変動緩和の可能性に影響を与えます.
科学分野:
- 環境科学 環境科学
- 土壌科学は,土壌科学である.
- 気候変動研究 気候変動研究
背景:
- 土壌は,地球最大の有機炭素貯蔵池を蓄え,大気中の二酸化炭素 (CO2) レベルに大きな影響を与える.
- 土壌は,気候変動の動態を調節する上で重要な役割を果たします.
- 大気中のCO2濃度の上昇が土壌の炭素貯蔵に及ぼす影響は複雑で,植物の成長,炭素の供給,微生物の分解を含む.
研究 の 目的:
- 大気中のCO2の上昇が土壌の炭素 (C) 貯蔵に与える純効果を調査する.
- 土壌のC投入とC回転の両方のCO2濃度の上昇に対する反応を定量化するために.
- 土壌における長期的な炭素吸収への影響を決定する.
主な方法:
- メタアナリシスとデータ同化技術の組み合わせを用いた.
- 大気中のCO2濃縮が土壌の有機炭素動態に与える影響を分析した.
- 土壌生態系における炭素の投入と炭素の循環率の量化変化.
主要な成果:
- 大気中のCO2濃縮により,土壌の炭素投入が著しく増加した (+19.8%).
- 同時に,土壌の炭素循環も,CO2が上昇した状態で16.5%増加した.
- 強化された土壌の炭素循環は,増加した炭素投入を相殺し,平衡土壌の炭素貯蔵量を低下させた.
結論:
- 大気中の高濃度のCO2は,土壌の炭素供給と微生物の分解の両方を刺激する.
- 土壌の炭素循環の増加は,土壌における純炭素蓄積を制限する重要なメカニズムです.
- この発見は,将来の気候変動シナリオの下での土壌の炭素収縮の理解と予測に重大な影響を及ぼします.
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