管理された泥炭地帯の温室効果ガス排出量に対する地下水面の制御を優先する
C D Evans1,2, M Peacock3, A J Baird4
1UK Centre for Ecology and Hydrology, Bangor, UK. cev@ceh.ac.uk.
Nature
|April 21, 2021
まとめ
トートランドは膨大な量の炭素を貯蔵します 乾燥した泥炭地帯の地下水層の深さの管理は 温室効果ガスの排出を大幅に削減し 農業利用を止めることなく 気候緩和の恩恵をもたらします
科学分野:
- 環境科学
- 気候科学
- エコロジー
背景:
- 地球上の泥炭地帯は 大気よりも多くの炭素を貯蔵する 重要な炭素吸収場です
- 乾燥した泥炭地帯は 人為的な温室効果ガスの排出に大きく貢献しています
- 保護と再浸潤は,泥炭地帯の排出量を軽減するための重要な戦略です.
研究 の 目的:
- 泥炭地帯からの温室効果ガスの流出に対する地下水の深さの影響を調査する.
- 水平面管理による排出量削減の可能性を定量化する.
主な方法:
- 二酸化炭素の渦巻き共変数データとメタンの静的室測定を用いた.
- イギリスとアイルランドのフィールドデータと世界の泥炭地バイオムのデータを組み合わせた.
- 温室効果ガスの流量に対する水表深度 (WTDe) の影響を分析した.
主要な成果:
- 温室効果ガスの流動を制御する主な要因は,効果的地下水深度 (WTDe) です.
- WTDeの10cmの減少は,WTDeが30cm以下になるまで,年間少なくとも3トンのCO2e/haの純温暖化効果を減少させることができる.
- 水位がさらに上昇すると,WTDeが表面から10cm以内になるまで,冷却効果が得られます.
結論:
- 乾燥した農地からの温室効果ガスの排出は WTDeの管理によって大幅に削減できます.
- 乾燥した農地での WTDeを半分に減らすことで,世界の人類による排出量を1%以上削減できます.
- 泥炭地帯の回復と管理は 持続可能な気候変動緩和戦略です
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