コンゴ流域中央の泥炭地群の年齢,面積,炭素貯蔵
Greta C Dargie1,2, Simon L Lewis1,2, Ian T Lawson3
1School of Geography, University of Leeds, Leeds LS2 9JT, UK.
Nature
|January 13, 2017
まとめ
コンゴ流域のクエット・セントラルには 世界最大の熱帯の泥炭地帯があり 炭素を大量に貯蔵しています これらの重要な泥炭地帯は 気候変動や土地利用に脆弱です
科学分野:
- エコロジー
- 地理科学
- 気候科学
背景:
- 泥炭地帯は地球表面の3%しかカバーしていないのに 地球全体の土壌炭素の3分の"を貯蔵する 重要な炭素吸収場です
- これらの炭素に富んだ生態系は,主に冷たい気候で,水浸し,無酸素状態で形成されますが,熱帯の沼林にも存在します.
研究 の 目的:
- コンゴ流域中央部のクエット・セントラル地域における泥炭埋蔵の範囲と炭素貯蔵量を調査し,定量化する.
- 泥炭の蓄積年齢を特定し,その形成を促した環境条件を理解する.
主な方法:
- フィールド測定は,泥炭堆積物 (深さ ≥0.3mの有機物質≥65%) を特定し,特徴づけるために行われました.
- 放射性炭素年代測定法を使って 泥炭の蓄積の時間軸を決定した.
- 現場データと遠隔検知データを組み合わせて,泥炭地帯の総面積と炭素貯蔵量を推定した.
主要な成果:
- 広範囲にわたる泥炭埋蔵がクエット・セントラレの沼林の下に確認され,約10,600年前に蓄積を開始した.
- Cuvette Centraleの泥炭地帯は,推定145,500km2をカバーしており,最も広大な熱帯泥炭地帯の複合体となっています.
- これらの泥炭地帯は約30.6ペタグラムの炭素を貯蔵し,世界の熱帯泥炭地帯の炭素を大幅に増加させます.
結論:
- キュヴェット・セントラレは以前は過小評価されていた主要な熱帯泥炭地システムです.
- 発見された炭素の貯蔵量は コンゴ流域の熱帯雨林全体と 比較できます
- この巨大な炭素貯蔵庫は 土地利用の変化や 降水パターンの変化によって 破壊されやすいのです
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