耐久性のある炭素除去方法として,3775年の木材の埋葬サポート"木製のヴォルトリング"

Ning Zeng¹, Xinpeng Zhao², Ghislain Poisson³

¹Department of Atmospheric and Oceanic Science and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA.

Science (New York, N.Y.)

|September 26, 2024

まとめ

4000年近く保存された古代の木は新しい炭素除去戦略を示唆しています無酸素の粘土に木質のバイオマスを埋めて年間数ギガトンもの二酸化炭素を吸収できます

科学分野:

環境科学
地質学
生地化学

背景:

地球上の光合成は毎年大気中の二酸化炭素を大幅に除去しますが,分解により大気中に取り戻されます.
長期にわたる炭素吸収は気候変動の緩和に不可欠です

研究の目的:

毒性のない土壌環境における古代木質生物質の保存の可能性を調査する.
埋もれた木質バイオマスを炭素除去戦略として使用する可能性を検討する.

主な方法:

2メートルの深さで粘土で保存された3775年前の古代木材の分析
古い木のサンプルと現代のサンプルを比較して,腐敗と炭素の損失を評価する.

主要な成果:

古代の木材は 3775年にわたって 5%未満の炭素の損失でほぼ完璧な保存状態を示しました
コンパクトな粘土土の低浸透性は,分解を防ぐ可能性のある要因として特定されました.
この方法によって年間最大10ギガトンの二酸化炭素を蓄積する可能性があると推定されている.

結論:

低浸透性の無酸素な土壌に木質バイオマスを埋葬することは,二酸化炭素の長期除去のための有望なハイブリッド自然工学アプローチを提供します.
この方法は,最適化後に1トンあたり30~100ドルと推定される,費用対効果の高い炭素封じ込めの可能性を示しています.

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