農業用土壌の侵食が地球規模の炭素循環に与える影響
K Van Oost1, T A Quine, G Govers
1Physical and Regional Geography Research Group, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium. kristof.vanoost@uclouvain.be
まとめ
農業用土壌浸食は,以前の考えに反して,重要な炭素吸収源として機能します. この研究は,地球規模の農地における侵食による炭素吸収を定量化し,気候変動研究に影響を与えている.
科学分野:
- 環境科学 環境科学
- 土壌科学は,土壌科学である.
- 気候科学 気候科学
背景:
- 農業用土壌浸食が世界の炭素循環に与える影響は議論の余地があり,その推定値は大きく異なる.
- これまでの研究は,侵食が大気中の二酸化炭素 (CO2) の純源であるか,または吸収源であるかを決定的に確立できませんでした.
研究 の 目的:
- 炭素吸収源としての農業用土壌浸食の役割を定量化するために.
- 農業の浸食が大気中のCO2レベルに与える純効果に関する既存の仮定に異議を唱える.
主な方法:
- 大規模調査からのセシウム137 (137Cs) と炭素在庫測定を用いた.
- これらの測定を適用して,土壌浸食に関連する炭素収縮量を推定しました.
主要な成果:
- 侵食による大気中の炭素の沈殿の一貫した証拠が見つかりました.
- このシンクを量化して,侵食によって運ばれた炭素の約26%としました.
- 農業の景観から年間0.12ペタグラムの世界の炭素吸収が推定されています.
結論:
- 農業用土壌の浸食は,大気中の炭素の注目に値する沈殿場を表しています.
- この発見は,大気中のCO2の重要な源または吸収源として,農業の侵食に対する支配的な見解に異議を唱える.
- 気候変動緩和戦略において,炭素吸収における侵食の役割を考慮する重要性を強調する.
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