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The Carbon Cycle01:14

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古代 の 炭素 量化 に よっ て 土壌 の 炭素 動 力 が 変化 し て いる

Yoann Copard1, Christine Hatté2,3, Lauric Cécillon4,5

  • 1Univ. Rouen Normandie, Université Caen Normandie, CNRS, Normandie Univ., Rouen, France.

Global change biology
|September 3, 2025
PubMed
まとめ

古代の放射性炭素のない有機炭素 (aOC) は土壌の炭素年代測定に偏っている. 土壌の炭素は以前考えられていたよりも若いので 気候モデルが改善されています

キーワード:
カーボン・ターンオーバー時間メタ解析母体材料放射性炭素放射性炭素のない有機炭素土壌有機炭素

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科学分野:

  • 地化学
  • 土壌科学
  • 気候科学

背景:

  • 土壌有機炭素 (SOC) は,気候変動の緩和に不可欠な地上の貯蔵庫です.
  • SOCの放射性炭素年代測定は不可欠ですが,古代の放射性炭素のない有機炭素 (aOC) によって複雑になります.
  • SOCの年齢の既存の推定値は,アドレスのないaOCのために潜在的に不正確です.

研究 の 目的:

  • 土壌におけるaOCの分布を定量化する.
  • 放射性炭素に基づくSOC年齢の推定を,aOCを考慮して修正する.
  • 地球システムモデルのパラメータ化と経験データを調和させる.

主な方法:

  • 線形混合方程式を放射性炭素データベースから 313 個の地球土壌サンプルに適用した.
  • 測定されたaOC含量と,異なる土壌深度におけるSOC総量への貢献
  • 修正されたSOCの年齢を計算するためにaOCの貢献を減算します.

主要な成果:

  • 平均aOC含有量は2.4mg/gで,上層土壌では11%,下層土壌では25%,深層土壌では50%以上である.
  • アンドソールとクリオソールは特に高いaOC含有量を示しています.
  • 1mの深さまでの非aOC炭素の平均年齢は290年であり,以前の推定値 (31004830年) よりもかなり若い.

結論:

  • aOCの存在は,放射性炭素ベースのSOCの年齢推定を大幅に歪めている.
  • 修正されたSOCの年齢は,他の同位体プロキシと経験的データとよりよく一致します.
  • この研究は,気候モデルの改善のために,土壌の炭素ダイナミクスのより正確な理解を提供します.