大気中のメタンの吸収量
Vincent Gauci1,2, Sunitha Rao Pangala3, Alexander Shenkin4
1Birmingham Institute of Forest Research, University of Birmingham, Birmingham, UK. v.gauci@bham.ac.uk.
Nature
|July 24, 2024
まとめ
木はメタンシンクとして 大気中のメタンを大量に吸収します この発見は 森林保護と再造林が かつて考えられていたより 大きな気候の恩恵をもたらすことを示唆しています
科学分野:
- 環境科学
- 森林の生態学
- 生地化学
背景:
- メタンは強力な温室効果ガスですが 大気中のメタンレベルに 樹木が与える影響は不明です
- ある研究によると 木はメタンを放出しますが 他の研究によると 木はメタンを吸収します 特に高地の環境ではそうです
研究 の 目的:
- 熱帯,温帯,北極の森林における樹木のインサイトメタン交換を調査する.
- 地球規模のメタン排出量における 木の表面の役割を定量化する.
主な方法:
- 樹木の表面でのメタン交換のインサイト測定
- メタンの安定炭素同位体分析
- 地球上の樹木の表面面積を推定する地上レーザースキャン.
主要な成果:
- 高地にある木は 特に2メートル以上の高さでは メタンの吸収が顕著です
- この吸収によって 樹木はメタンの吸収源として機能します
- メタノトロフィー つまり微生物によるメタンの消費が この吸収を誘発するメカニズムであると考えられています
結論:
- 特に熱帯および温帯の森林は,以前から考えられていたより大きなメタンの吸収源である可能性があります.
- これらの地域の保護と再造林は 気候変動の緩和に向けた取り組みを 強化する可能性があります
- この研究は,木々のメタンの吸収を24.6~49.9Tgの範囲で予備的に推定しています.
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