大気中のCO2の上昇は,根源から得られる土壌の炭素の結合を減少させます
James Heath1, Edward Ayres, Malcolm Possell
1Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, UK. j.heath@lancaster.ac.uk
Science (New York, N.Y.)
|September 10, 2005
まとめ
森林の炭素吸収源としての役割は,二酸化炭素の濃縮によって減少する可能性があります. 土壌呼吸の増加と根の炭素吸収の減少が観察され,気候変動を加速させる可能性がある.
科学分野:
- 森林生態学 森林生態学とは
- 気候変動科学 気候変動科学
- 土壌科学 土壌科学
背景:
- 森林は重要な炭素吸収源として機能し,大気中の二酸化炭素濃度の上昇と気候変動を緩和する上で重要な役割を果たしています.
- 大気中の二酸化炭素の増加が森林の炭素吸収に与える影響を理解することは,正確な気候モデリングに不可欠です.
研究 の 目的:
- 欧州の樹木種の成長と土壌の炭素動態に対する二酸化炭素の増加の影響を調査する.
- これらの変化が地球上の炭素吸収容量に与える潜在的な影響を評価する.
主な方法:
- 制御された実験で,ヨーロッパの様々な樹種を,二酸化炭素を濃縮した大気にさらした.
- 樹木の成長刺激と土壌微生物の呼吸率の測定.
- 土壌における根系由来の炭素結合の定量化.
主要な成果:
- 短期的な成長刺激は,二酸化炭素濃縮下でヨーロッパの樹種で観察されました.
- 土壌の微生物呼吸の有意な増加が検出されました.
- 土壌内の根系由来の炭素の封じ込めの顕著な減少が観察されました.
結論:
- 二酸化炭素濃度の上昇は,地上の炭素吸収器の有効性に悪影響を及ぼす可能性があります.
- 土壌呼吸の増加と炭素収縮の減少は,陽性フィードバックループにつながり,大気中の二酸化炭素の上昇を加速させる可能性があります.
- 森林の生態系は,将来の大気条件下で気候変動を緩和する能力が低下している可能性があります.
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